113 00' 33 R 10 W 3 -Cpm 4 R 9 W p-Cm - R 8 W 45' 35 Qla P Cp Qla Qvb 3 B Qla QTlf Qlm 5 6 R 7 W Qla Qaf1 3 R 5 W 3 Qpm Qed R 6 W 7 30' 8 3 A Qaf1 -Cp Qla Qaf1 Qes Qlm Qlf Qpm R 4 W 9 15' Qlg Qed Qed Qlf Qla Qaf1 Qed Qed Qla Qpm Qed Qed P Qlm QTlf Qlm Qed p-Cc Qaf2 Qaf Qlf Qed Qdf Tdr Qaf1 1 Qed Qed -Cpm p-Cm Qla Qla Qla Qlf Qed Qed p-Cm Tdi Qaf1 Qla Qed Qed p-Cc B Qdf Trk Qaf2 Qlm Qaf1 Qed 85 86 -Cdh -Cp Qed Qaf1 Qaf1 30 Qaf Qlf Qed Qed -Cp Tdr 1 Qed B Qla Qpm Qdf B -Cpm -Cpm P Qlf Qed Qal -Cdh -Cp Qlm Qla 1 p-Cm -Cp Qaf1 Qed Qlf Qal - Qed 2 -Cpm Cdh ? Qdf Qdf Qdg p-Cc -Cdh Qla Qla Qlf/Qal /QTlf Qdg/Qdf Qal2 60 -Cum -Cp 25 3 Qed p-Ci 45 -Cww - Qla Qed Qed Qed Qdf -Cp Cpm -Cpm Qed Qdg Kc Qla Qpm Qed -Cpm 87 -Cdh -Cdh Qaf1 Qed Qdg -Cdh -Cp Qpm -Cww Qla Qdg Qes Qdf B -Cp Qed Qed Qed Qdf Qaf1 - P Cp B Qdg 20 -Cww Qla Qpm Qes p-Cm -Cp -Cww 30 Qaf -Cum Qaf 1 2 -Cp Qla Qed Qal2 -Cdh -Cdh -Cdh Qed Qes p-Cm Qed Qed Qaf1 -Cpm -Cmp Qla P Qed Qal1 -Cww Qms Qla 78-1 -Cp Kc -Cdh Qed Qed Qdf - p-Cm -Cww 86 39 30' Qaf2 -Cmp Cmp -Cww -Cum 80 B Qaf1 Qlm Qed Tdr Qed 64 Tdr Qaf Qlg Qdf Qdf Qdf 60 2 Qal2 Qaf1 Qlg Qed p-Cm Qaf2 Qla P Qal Tdr Qlg Qaf Qla 1 R 3 W 40 Qla 1 Qes Qed 1 825 R 2 W 41 1 850 000 FEET 112 00' T 15 S -Cww QTaf QTas Qdf 39 30' Qlm Qed Qaf -Cdh QTaf Qdf 1 -Cum Qaf1 Qdf 15 Tf Qaf2 Qaf Qaf1 ? QTaf Qac 2 Qaf -Cp QTaf Qlg Tdr 2 Qal p-Cc Qms Qaf1 B Tbsk 1 85 QTaf QTaf Qdf Tf B Qlg Qdf TKn Qaf Qdf Qal Qes Qal2 Qla p-Cc Qaf2 Qms 1 Tf Qaf Tdr Qla Qla 2 Qes Qed QTas 2 Qaf1 -Cdh QTaf Qaf Qed p-Cm - Tf Qlg Qaf2 1 Tbsk -Cp Cww QTaf - 40 TKn QTaf QTaf QTaf Qaf1 Qed -Cpm Tf Qlm Qal2 Qed B 40 B T 15 S Qed 70 B QTaf Tdr p-Cp Qaf 80 Tf 2 p-Cm 21 QTaf Qal1 Qal1 Qac Qaf1 Qed -Cp 33 QTaf Tf Tf Qlm Qla Qed Qac Qaf2 Kc QTaf 4370000mN Tdr Tbsk Qdg/Qdf 40 Tf 437 Qla Qed -Cdh Tf Qaf2 Tld Qaf1 30 -Cww QTaf P QTaf B Qed p-Cc QTaf Qal1 42 Qdf 15 Tdr Tld Tbsk - 70 Qla Qal Cdh 50 Tf QTaf Qaf2 2 75 38 Qdf Qla Qla Tld Qal Qaf Qac QTaf QTaf Tg 2 35 1 -Cum 61 Qlg Qed Qsm Qac p-Cm B Tbsk Qal Qal B -Cp -Cdh 43 Qlg Qlm 2 Qed 2 TKn Qaf Qdf B Tld Tld 72 Tf 1 A' Qla Tbsk Qlg 42 65 70 Qaf2 Qaf1 p-Ci -Cpm -Cp 45 Tf B Qlg Qll Qdg/Qdf QTas QTaf Tld 55 36 Tld Qal2 70 40 QTaf Qaf2 Qla Tld Qed Qed Qlg p-Cp p-Cm QTaf Qaf1 Qed Qaf Qaf2 Tf Tf Qdf P Trk P 2 Qaf1 Qla -Cpm QTaf Qdf Tld Qed Qal 60 35 QTaf QTas 2 Qlg 70 Qdf Qaf1 Qlg Qlm Qlm 9 Qal2 B p-Cb 40 QTaf Qaf2 Qla P QTaf 16 p-Cm TKn B QTas Qes 6 Qla Qal2 Tfc 21 QTaf Qaf1 Tr Tr Qdf Tld Tld Tld Trk P QTaf Qes Tdr 56 33 Qed Qsm Tfc QTaf Qdf QTlf 20 P Tfc Tfc B B Qll Qal1 B 11 Qed Toc Tf 8 Qaf1 Tld Tdr P 11 Qlf p-Cp Tfc QTas Qes Tld Qla Tr -Ct p-Cm Kc Qlg Qlm 40 Tf Qdf Qdf 81 70 Qaf Qdf Tdr QTlf 2 QTaf QTaf Tf 400 5 P Tr Tr Qaf2 p-Cp 55 QTas Qaf1 Qlm Tr 42 -Cpm Kc Kc 56 Qal Tld Qll 8 P Qed -Cpm p-Cm QTas 1 T 16 S Tld 30 70 23 QTaf QTaf 400 000 QTlf Tr Tr Qaf1 Qes p-Cc QTaf Tdr Qlg Tr Qed Qlg QTaf FEET Qlk 74 74 Tr p-Ci Tf B Qla Tr Tr Qal1 Tf Qdf Tdc Qlm Tld 30 P p-Cb 50 Qaf Tld 56 Tr Qaf1 77 52 Tf 1 10 Qdf P Qla Toc Tf QTaf QTas 81-3 B Tdr Qlk Qlm Qal1 Qac p-Cc B Qla Qla Qal2 -Cpm 60 QTaf 30 38 45 p-Cc B Qed B -Ct Kc 6 Tr 3 p-Ci p-Ci Qac Qal1 Tld Qla Tf Qdf Qlg Qlg Toc QTaf B B 70 Qal1 Qaf2 Qla Qla 4 Qal1 Qac Tld 9 Toc B Qlg Qal Qlm Qes 2 30 30 QTaf TKn 25 QTas T 16 S Qaf1 Qaf Qal1 Qal Qaf2 20 p-Cp p-Cc QTas 1 Qdg/Qdf 2 Qed Qla p-Cm 48 45 QTaf Qal2 TKn Qlf Qaf1 Toc Qac Qac Qdf Tld P Qac 75 QTaf Qvb3 Qal2 p-Cm 53 TKn 30 Qal1 QTas QTas Qdf Qed B Qed 30 Qal Qaf1 - QTaf 1 Qdg/Qdf B pCb 4 B Toc -Cpm QTas Qla Qaf1 Qed -Ct p-Ci QTas P Qla p-Cp p-Ci B Qaf 9 Qlm Qal2 Qaf2 2 Qaf Qed Qac -Cop Kc 1 Qaf2 Toc 20 QTaf 20 Qlf Qaf1 B Qlg Qla Qal 65 25 Kc 43 B Qlm 1 p-Cp 30 Kc QTaf QTas 43 6 Qlm Qlf Qed Qed QTas 6 Qla Qaf1 QTaf QTas Qac Qlm Toc Qaf1 Qal B 70 Tf Tld Tld QTlf 2 Qaf2 Kc QTaf QTaf Qed p-Cp Qlm Toc -Cop QTas Qdf Qla QTlf Qal - 65 QTaf Tf Tld Qdg/Qdf 2 Cum Qaf Trk Tld QTlf 2 QTaf 20 QTas - 80 B B P pCp 20 - Kc Qaf p-Cp Cpm B QTaf Qla Qed 1 p-Cp - QTaf Qal1 QTlf Qaf pCp p-Cm Kc p-Cm Qla 1 B Qaf p-Ci Qdf Trk Qal2 Qaf2 2 p-Cp Kc Tf Qal2 P p-Cc QTas Qaf -Ct Op 30 375 1 - 11 QTaf Tf B QTaf Tf QTaf Qed Qed Qlg -Cop p-Cc Cpm p-Ci QTaf Qlg B QTlf Tqb - p-Cm Qal Toc Ct 1 QTas Qlg Qed 15 Dgu QTaf 375 QTlf Qlg p-Cp p-Cc p-Cm 25 -Ct QTaf QTaf Qal1 Qed Tcb p-Ci - Kc Qds Qla QTlf pCi Tf QTlf p-Cp p-Cp Dc B Tqb p-Cc p-Cc Kc Dss B Tf Qed - Tf Qaf1 Qaf2 25 pCm 16 Qlm Qed p-Cm Kc QTaf Tf Qdf Tqb 30 -Ct Dgu QTaf P Qed Kc QTaf QTlf Qal Qed Qes QTaf 2 Tqb Tqb p-Ci B Qla Tqb p-Cc p-Cm 15 Qla Qed Qed 25 Tf QTaf T 17 S Qed Qed Toc 60 30 32 Qal 2 Qes Qed Tqb Tqb Qms p-Cc Qla Qes Tqb Qaf2 Qac Tf Tf Tf 15 Qal p-Cb p-Ci p-Cb Tf Qlm Qla 2 Qed B 20 -Ct -Cop Dss Qac Qed Toc Tcb Tqb -Ct Qaf2 p-Ci 31 22 Qaf1 Tf 20 Tf Qes Tcb 70 p-Cb Tf Qed P Qlg Op p-Cc 30 Tf Qal2 Qes Qla Tqb Qlm Qla Tqb -Cum Qac TKn TKn Qal1 Tf -Ct Qac TKn Qes Toc 45 Qed Tcb 22 25 26 10 Toc Toc Dgu 30 Tf B Qaf2 -Ct p-Cb 20 Tf Qed Qes Qes B Toc Tcb 18 TKn Qac Tf 20 2 TKn TKn T 17 S Toc Tcb - TKn Qaf1 Qed Qed Tcb Cop 9 25 Qed Qed Toc -Cop p-Ci Qed Qal p-Cb Dss Sl Qla 2 Qac Qlf Qed Op p-Cc 15 Qed Qes -Cop Dss Kc 10 Qed Qed Toc 80 p-Ci Qed P Tcb TKn Qed Qed B p-Ci 12 Toc Toc Qed -Cum Dss Qac Qed Sl Qes - Qed Qed Qes p-Ci 35 pCm Qed Qlg Qaf2 60 p-Cb QTlf Toc 35 Qaf QTlf Qed Qed Qed p-Cp Dss Dss 1 TKn Qes Qes 80 Kc Qed -Cop p-Cb 350 Qed Qal2 - Qac Qaf1 Cpm 12 Qac 43 Qed Qed Qed TKn 5 Qlg Toc -Cop Qla Qed Qed Qed 12 Sl 350 Qed Qed -Cop p-Cb Qac Qed P Qlg Dss Qlf p-Ci Qac Sl Qac 12 Qed Toc Dss Qed Toc Qed Qed Qes p-Cc 20 -Cop 30 Sl Qlg 75 Qed p-Ci Qac Sl Qal2 Qed Toc 35 Qla Qal2 Toc Dss Toc 30 Sl Qac Qed Qed Qed Qed Qes Toc 37 Qla Qes QTt -Cop -Cum p-Cc 30 Sl Tf Qal Qed Qed 2 Qed -Ct Qed B Qes Qlf QTt -Cum p-Cp Qaf Qed Sl 1 Qed Qal2 p-Ci QTaf Qla p-Cc Qlf Qed 10 p-Cp Qla 30 p-Cc Sl Ofh Qlf Qed Qed Qed Qal Oe Qal 2 Qed Toc -Ct 30 p-Cc 1 15' Toc Qed Qed P -Cop - Dss Op Tf Qal2 Qal2 Qed 81-1 pCi Qed Qlf Qaf1 Oe Qed Qed Qes -Cum p-Cm p-Cc Qac Qal2 Qal2 Qed 12 Qaf Qes Op 1 Qed Qed Qed -Ct p-Ci p-Cp Qaf T 18 S Qed Toc Op 1 10 Op p-Cb Ofh B p-Cm Qed Qes Qaf p-Cb Oe 7 Qla Qed Qes 2 15 Qla Qed Qed Qed Qed Qed Qed p-Cc QTaf 15' Qal Qed Qes p-Cp p-Cc Sl Op Qed Qal2 2 12 6 Qac Qaf1 Qms p-Cb Qac 3 Qed Qed Qed Toc Qes Toc Oe Oe Qal2 Qlf Qed Qed p-Cp Ofh Op Qal Qed Qed Op Oe TKn 2 Qed Qaf Toc Qaf1 Qed Qed 2 Qaf2 Op Qed Qed Qed Qes Qes Qal2 Qed B Op Qed P Qac Ofh QTaf Qed Qed Qaf1 -Ca T 18 S Qal2 Qed Qes Qed Toc P 12 Op Qed Qed QTln Qes Qlm 30 Oe Qaf1 Qal P Qlm Qed -Ca 60 2 Op 5 325 Qlf Qed Qed -Ca 34 Qal2 Qaf QTlf Qed QTln 2 Toc 30 42 Qms 3 Tf B' Qal1 Qed Qed Qed - Op Qes 325 Qes Toc Cox Op Qac QTaf Qlf Kc Qaf1 Qal Qed Op Toc 8 Qal 2 Qed Qes Qla -Ca Op 2 Qed -Ca Op -Ca Oe 10 Tf Qac Qal2 Qed Qes -Ca 34 -Ca -Ca Qms Ofh Kc TKn Toc 6 Qlm B p-Cp Dss Toc 45 27 Qac 25 Op Toc 20 Qaf1 Qed Qed Qaf1 Oe 20 Qed -Ca -Ca Toc 5 Qlf P Qlf/Qvb3 Sl -Ca Qac Ofh Sl TKn Qlf Qes Ofh Toc 6 Qms 43 Toc Sl 12 43 4 Qal2 TKn 4 Qlk Qed Qvb Qlf Qaf1 Toc Dss TKn 12 Qed Qlm 3 Dss Qed P Toc -Ca Sl Sl p-Cp Toc Oe Qpm/Qlf Qpm Qes Op Sl Qac Qed Qal2 P Qed/Qlf Qed Qva Qpm Ofh Sl Dss TKn B Op 10 Qlm Qed Qed p-Cp Toc Toc Qal2 Qes Op Oe Op Toc Ofh 13 Qla Qed Sl Ofh Sl Qal Toc Dss Oe Oe Qla Qal 2 Sl 10 QTaf Qlf 2 Qpm Qaf1 Toc G Qlf Qaf TKn Qed Ofh Ofh Toc 15 Dss 18 1 - Qed Qed Toc 20 Op Cpm Qed Qvb Qlf Sl Ofh Oe Sl 15 Qed Qes 3 Qvb 25 Qaf1 QTlf Qed 3 Ofh Sl Op -Ca Ofh 12 Qed Qpm Qlg Qed Qed -Cox Oe Sl Qal Qed Qvb Toc 1 Qed 3 B Ofh 50 QTaf Qal2 Qal2 Qlf -Cht Kc Qed 25 Qed Qed Qaf1 Toc - QTaf Qed Qlf Qlm Toc Ca -Ca Sl QTaf Qed Qlf P Op Qed Qes Qes -Cox TKn Qac Qla Qed Qed Qpm Qvb Toc Sl Qal2 Qlf 3 Qes Qed Toc -Ccb QTaf T 19 S Qlg Dss QTaf 10 9 G Qva Qlf Qed G Toc -Cht Qlg Qed Qpm Qes Qlg -Ca Ofh Tf Tf Qal2 Qal2 Qla QTaf Oe Sl 11 300 Qpm Qes Qed Qaf1 18 Qaf1 -Cox 5 QTaf Qva Qes B Sl Qac Qal2 Qvb Qlm Sl Sl G 3 Qes 300 Qlf -Ccb 20 Qms Qac Qes Qls Qes Qaf2 QTaf -Ccb Op 25 Sl Qaf1 Qed Qpm Oe TKn Tf G Qaf1 Qsm P TKn Qed Qal2 Qla Qlg 20 -Ca Ofh Sl T 19 S Qes Qes Qac Qac 95-2 Qal1 Qaf1 Qes -Cox Oe Sl 81-5 Tf Qlf Qaf -Cht Qlf Qlf 1 P Sl Tf Qes Ofh 13 10 Qvb3 Qvt Qaf B Qes 1 Toc Toc -Cox -Ca Qaf1 Qdg Qaf1 Qes Qes - -Cox Ofh Qac B Ccb Qlg Qlf Qlg -Cht QTaf Qvt - Sl Qlf -Cpm Qed 30 Ca Op Qac TKn Tf Qaf Qed Qpm Qlg QTaf 10 Tf 1 Qvt Qed 15 Oe Qac 81-7 Qaf1 Qlf 15 Qlf G B QTaf 12 Qed/Qva Qes Qac Op Qlg Qlf 10 -Cop -Cox P -Cpm Qaf1 Qls Toc -Ccb -Ca G -Cpm Qes P G Qlg Qla Qpm/Qlf Qed QTaf QTlf Qes Qes Toc 14 40 Tf Qlg Qlf Qlg Tf -Cpm Qaf1 -Ct Qlg QTlf Qes Qlf -Cht Tf QTlf Qlf/Qdg Qes Qes - QTlf Qal2 Qdg Qlm Qes Ca 43 Qlf Tf Qlf -Cop 43 3 Qlf QTlf QTlf Qed Qvb Toc -Ct 24 3

Tf P 3 - Qvb Qlf B Cop Qal 3 22 1 -Cpm Qed/Qva P Qlf Qaf1 47 Qed Qal1 6 -Ct Qla Qlm Qed Toc Qlm Qlf Qed/Qva 25 Qes Tf Qes Qes Qaf1 -Ct Qac -Cpm Qlm Qlm Qes - -Cox -Cox G B Qlf - Ccb Tf Tf Qlk -Cpm Qlf/Qvb3 Qlg 12 Cop Tf QTlf P Toc TKn Qal1 Qaf2 Qlf/Qdg Qvb Qaf2 QTaf Toc Qac Qed Qlf QTlf P P 3 Qlf TKn Qaf1 QTlf 8 QTaf Qlf P Qlm Qed -Ct Qac 12 Qaf1 -Cpm -Cpm Qes Toc 25 4 Qlm Qpm/Qlf 7 Qlm 7 Qaf -Cpm Qvb 12 2 B 3 -Cht TKn Tf 275 Qaf Qla Tf 1 -Cpm -Cpm Qpm/Qlf 14 Qlm Qlf/Qdg Qlf/Qdg Qed/Qlf -Ct TKn B Qlf Qlf -Cop Qaf1 -Cpm Qlg B -Cp 7 Qed/Qlf Tf 275 QTlf P Tf Tf Qlf -Cht Kc D B -Cpm Qlm Qlf P Toc Kc Tf -Cpm Qac Qla Qlm -Cp -Cp Qvb3 C Qes -Ct Qaf1 - 9 P Qed/Qlf 16 T 20 S Qls Cpm Qaf2 Qlg Qal1 Tf -Cpm -Cpm Qaf Qal2 Toc Qlg Toc Qaf2 Tf 1 Qlf Qaf2 -Ct 15 Qla Qaf B Qed/Qlf/Qvb Qvc Qvb3 Qed Tf Qdm G Qlm 4 1 -Cpm Qll 3 Qlf Qac QTlf Tf B Qlf Qaf1 Tf Qal1 -Cop 5 -Cp P Toc Qaf1 Qla Qls B 5 Qlg Tf Qlf/Qvb P Qvb Tf -Cpm Qlf 3 3 Qlg Qaf1 76-1 B Qvb Qvb -Cdh -Cp 3 3 Qlg - Qal1 16 Qaf Tf 7 Qvb3 Cht Qlm P 2 Tf QTaf 15 Qgt -Cp 17 -Cpm Toc -Ca TKn Qlg Qaf2 P Qac Qaf1 4 -Ct Tf Qdg Qes Qvb Pc Toc -Cpm Tf - -Cpm P 3 96-1 Cp Qdg Qvb3 B Tf Qdg Qvb3 Qac QTlf Qaf2 Qaf2 -Cpm Toc 16 TKn T 20 S Qla Qlk Qac Qls Tf -Cpm -Cpm 80-3 Qvb3 Qaf1 Qlk -Cpm QTlf Qed Qla Qlg Qac Qlm -Cp Tf Qaf2 Qvb3 Qlf -Cox G -Cp Qdg Qed/Qlf/Qvb Toc 26 10 Qaf -Cpm B Tf 4 3 Qlf Qvb 22 1 12 6 Qlk 3 Qlg -Ct 23 16 5 Qlg Toc - Qls Tf Qlf Cop -Cpm B Tf -Cp 6 QTlf P Qvb B - Qlm 8 Qdg Qlf Qvb3 3 P Qaf Qac Ccb Kc 24 -Cpm Qlm B 2 QTlf -Cp Qaf2 -Cpm Qvb3 Qal1 Toc 20 P Tf Qlm Qvb3 Qla 10 Qdg Qlf Qgt TKn 20 P QTaf - Qlg B Qlm Qaf2 - QTlf Qvb Qlg Qaf Cht Qaf1 5 3 Cpm 3 2 Qac -Cpm Tf -Cpm Qlf Qlf -Cop B 6 C' 15 Qaf Qaf2 Qdg Qlf Qgt 18 18 2 -Cpm Qlf D' Qac QTlf Toc -Ct QTlf QTlf - Qal2 20 QTaf Qla Cpm Qac TKn Qaf1 QTlf Qla 15 Qla 10 Qdg Qac QTaf Tf Tf Tg T 21 S P 10 Qlf Qlf QTlf 4320000mN B -Cpm Qdg B 12 Qlf Toc 16 QTaf 10 250 000 Qla 4 20 19 B -Cpm B 5 FEET - Tf P Qdg Kc QTaf Cp Qal1 Toc -Ct QTaf -Cpm Qaf2 Qlf Qdg P Qlg QTaf Tf B Qed/Qlf/Qdg TKn 12 275 Qlg QTlf -Ct -Cop -Cht B Tf 8 Qaf2 15 Qaf1 Qaf1 B Qdg Qaf1 10 - QTlf -Ccb Tg Qaf2 -Cpm Cpm -Cpm Toc QTaf 39 00' Tf Qdg Qal1 Toc Qac Qaf1 Qvb 8 113 00' 33 Qdg 1 -Cop 15 Qal QTaf 1 600 000 FEET 3 Qlg Kc 1 R 9 W 4 Qal1 Qla Tf 1 625 B - 45' R 8 W 1 650 -Cop -Cop -Ct Cox QTaf QTaf 1 675 3 Qal1 TKn Qgt Tg Tg UTAH GEOLOGICAL SURVEY R 7 W 6 1 700 Toc Tht Qac -Cht TKn Qac R 6 W 30' 1 725 Tf - Qgt TKn Tf T 21 S R 5 W 38 1 750 Cop 45 Tg Tse R 4 W 1 775 3 QTaf a division of 9 15' 1 800 4 R 3 W 0 1 825 1 39 00' UTAH DEPARTMENT OF NATURAL RESOURCES R 2 /2 W 410000mE 1 850 R 2 W 112 00' in cooperation with U. S. GEOLOGICAL SURVEY Plate 1 of 2 SCALE 1:100,000 Utah Geological Survey Map 184 Statemap Agreement No. 98HQAG2067 Contour interval 40 meters GEOLOGIC MAP OF THE DELTA 30' x 60' QUADRANGLE AND PART OF THE LYNNDYL 30' x 60' QUADRANGLE, Geologic map of the Delta 30' x 60' quadrangle, Projection: UTM Zone 12 2 1 0 2 4 6 8 10 Kilometers and part of Lynndyl 30' x 60' quadrangle. Units: Meters NORTHEAST MILLARD COUNTY AND PARTS OF JUAB, SANPETE, AND SEVIER COUNTIES, UTAH 13°18' Datum: NAD 1927 UTAH 237 MILS 2 1 0 2 4 Miles GIS compilations: Denise Y.M. Laes, Ann Tillia, Spheroid: Clarke 1866 by Kent D. Brown, and Basia Matyjasik Project Manager: Jon King Lehi F. Hintze and Fitzhugh D. Davis Base from U.S.G.S. Delta and Lynndyl 30' x 60' quadrangles 2002 MAGNETIC DECLINATION The views and conclusions contained in this document AT CENTER OF SHEET are those of the authors and should not be interpreted 2002 as necessarily representing the official policies, either express or implied, of the U.S. Government. LITHOLOGIC COLUMN GEOLOGIC SYMBOLS DESCRIPTION OF Fine-grained lacustrine deposits--Grayish- Basaltic andesite north of Smelter Knolls Eureka Quartzite--White, thin- to medium- Lower Cambrian, undivided--On cross 4. Galyardt, G.L., and Rush, F.E., 1981, 16. Michaels, R.B., and Hintze, L.F., 1994, PLATE 2 of 2 GEOLOGIC UNITS Qlf tan, tan, and light-gray, calcareous silts that Tbsk --Dark-gray, finely crystalline, basaltic Oe bedded, cliff-forming quartzite; locally -C l sections only; for included units see Geologic map of the Crater Springs Known Geologic map of the Scipio Pass quadrangle, are deep-water sediments of Lake andesite; exposed thickness about 30 feet brecciated and attenuated; 180 feet (54 m) correlation chart and descriptions. Geothermal Resources area and vicinity, Millard County, Utah: Utah Geological Bonneville, Lake Gunnison (both late (10 m); age 6.1 Ma. thick in the Canyon Mountains where it Juab and Millard Counties, Utah: U.S. Survey Map 164, 25 p., scale 1:24,000. Pleistocene), and Sevier Lake (when it may be structurally thinned; about 395 feet Pioche Formation--Dark-green, micaceous, Geological Survey Miscellaneous Map 184 MAP THICKNESS SCHEMATIC Quaternary surficial units, undivided--On Tuff of Holden--White tuff interbedded with - phyllitic siltstone interbedded with light- 17. Millard, A.W., Jr., 1983, Geology of AGE MAP UNIT OTHER INFORMATION contained surface water in the Holocene); (120 m) thick in the northern Pahvant Range. Cp Investigations Series Map I-1297, scale SYMBOL FEET METERS COLUMN CONTACT Q cross sections only; for included units see Tht pink to white, shaly siltstone, clay, grit, and brown to greenish-black quartzite that the southwestern quarter of the Scipio North Geologic Map of the Delta 30' x 60' Quadrangle Dashed where location inferred. correlation chart and descriptions. locally includes younger alluvium; thickness 1:24,000. Q-various Alluvial, lacustrine, eolian, basalt, and other deposits 0-1,000± 0-300± probably 10 feet (3 m) or less. gravel in section 10, T. 21 S., R. 4 W.; may Pogonip Group--Medium-gray, generally locally contains abundant trace fossils; (15-minute) quadrangle, Millard and Juab and part of the Lynndyl 30' x 60' Quadrangle, Northeast Millard County be as much as 200 feet (60 m) thick; age Op thin-bedded, silty to fine-sandy limestone orange-weathering dolomite beds occur in 5. Higgins, J.M., 1982, Geology of the Counties, Utah: Brigham Young University Qvb1 Basalt of Ice Springs 0-200 0-60 660 to 4,000± years Alluvium, upper Holocene--Youngest and parts of Juab, Sanpete, and Sevier Counties, Utah Y Lacustrine lagoon deposits--Sand, silt, clay, probably 10.5 to 10.8 Ma. with intraformational conglomerate beds uppermost Pioche; thickness 415 feet (127 Champlin Peak quadrangle, Juab and Geology Studies, v. 30, part 1, p. 59-81,

R alluvium in the channels, floodplains, and Qva,Qvt Basaltic ash (va) and tuff (vt) of Pahvant Butte 0-600 0-180 15,300 to 16,000 years Qal1 and silty marl that accumulated in lagoons common in the middle third; upper 320 feet m) in the Drum Mountains, about 800 feet Millard Counties, Utah: Brigham Young scale 1:24,000; modified by L.F. Hintze, by Lehi F. Hintze and Fitzhugh D. Davis A adjacent low terraces of the Sevier and Qll Fool Creek Conglomerate--Boulder to

N Qvc Basaltic cinders 0-30± 0-10± Pre-Lake Bonneville behind (landward) gravel barrier beaches (98 m) is interbedded, olive shale and thin- (245 m) in the northern Cricket Mountains, University Geology Studies, v. 29, part 2, 1997, unpublished mapping for this EROSIONAL SURFACE Beaver Rivers, streams in Round, Scipio, cobble conglomerate with a pink, silty, 2002 R Shown on cross sections. of Lake Bonneville; locally includes younger Tfc bedded, fossiliferous limestone; total and about 750 feet (228 m) in the Canyon p. 40-58, scale 1:24,000; modified by L.F. publication, primarily of Precambrian units, E Basalt of Pahvant Butte 0-1,000 0-300 128,000 years and Mills Valleys, and other perennial calcareous sandstone matrix at the head of T Qvb3 streams; also in lower Pahvant Valley near alluvium; generally less than 10 feet (3 m) thickness 1,684 feet (513 m). Mountains. Hintze, 1997, unpublished mapping for this scale 1:24,000; also Lawton, T.F., DeCelles,

A Basalt of Deseret, Pot Mtn., Sunstone Knoll 0-300 0-100 0.4 Ma local vents thick. Fool Creek in Canyon Mountains; age publication, scale 1:24,000; also Lawton, P.G., Mitra, Gautam, and Sprinkel, D.A., U West Mountain; consists of sand, silt, and uncertain; up to 530 feet (160 m) thick. PARAUTOCHTHONOUS CAMBRIAN Prospect Mountain Quartzite--Pinkish- to Qvb5 Basalt of Crater Bench 0-20± 0-6± 0.95 Ma

Q T.F., DeCelles, P.G., Mitra, Gautam, and 1997, unpublished mapping, scale 1:24,000, clay with lenses of gravel; mostly 0 to 20 Lacustrine marl--Fine-grained, thinly bedded AND PRECAMBRIAN STRATA OF THE -C pm brownish-gray, fine-grained to pebbly, UTAH GEOLOGICAL SURVEY QTaf,QTas Alluvial fan (af) and Sevier River (as) deposits 0-300+ 0-90+ (On map) Red Knolls Tuff--Grayish-pink, crystal- Sprinkel, D.A., 1997, unpublished mapping, for figure 10 in Lawton, T.F., and others, feet (0-6 m) thick, but may be thicker locally. Qlm to laminated, white to light-gray, offshore PAVANT THRUST PLATE vitreous quartzite; thickness in Drum a division of T QTt Travertine in Canyon Mountains near Whiskey Spring 0-140 0-43 ? Trk rich, dacite, welded ash-flow tuff present scale 1:24,000, for figure 10 in Lawton, 1997, Stratigraphy and structure of the Q to deep-water marl deposited in Lake Mountains about 4,000 feet (1,200 m) and (Shown vertical or inclined Alluvium, middle and lower Holocene-- T.F., and others, 1997, Stratigraphy and Sevier thrust belt and proximal foreland Utah Department of Natural Resources Bonneville; ostracodes are abundant in the Drum and Little Drum Mountains; Cambrian, undivided--On cross sections 2,760 feet (835 m) in northern Canyon QTlf,QTln Fine lake sediments (lf); shoreline deposits (ln) 0-870+ 0-265+ Pliocene to mid-Pleistocene on cross section) Qal Tan and gray silt and sandy silt in large about 200 feet (60 m) thick; Ar/Ar age 36.5 - only; for included units see correlation chart structure of the Sevier thrust belt and basin system in central Utah: Brigham in cooperation with Oak City Formation 2 throughout marl and, locally, gastropods C Mountains.

. Tqb THE UNITED STATES GEOLOGICAL SURVEY Toc 0-2,000± 0-600± 2-11 Ma? NORMAL FAULT low-gradient alluvial fans of the Sevier and Ma. and descriptions. proximal foreland basin system in central Young University Geology Studies, v. 42, O Tcb including quartzite (qb) and carbonate (cb) breccias Beaver Rivers, terraces of the Sevier River, are present at top and base of marl; 0 to 30 STATEMAP Agreement No. 98HQAG2067 I Dashed where location inferred; dotted where Precambrian strata--On cross sections only. Utah: Brigham Young University Geology part 2, p. 33-67, figure 10, scale 1:94,000. L Tr Rhyolite of Smelter Knolls Flowdomes 3.4 Ma and abandoned Sevier River channels on feet (0-9 m) thick. Volcanic sequence of Dennison Canyon-- Upper and Middle Cambrian carbonate p-C Studies, v. 42, part 2, p. 33-67, figure 10, P concealed, location approximate; queried where - - Only the basal tuff member is present in Cum rocks, undivided--Medium- to dark-gray 18. Oviatt, C.G., 1989, Quaternary geology

. the Sevier River delta; 0 to 30 feet (0-9 m) Tdc Tbsk Basaltic andesite north of Smelter Knolls 0-30+ 0-10+ 6.1 Ma Tse- Sevier River speculative on cross section; bar and ball on Lacustrine and alluvial deposits, scale 1:94,000. O Formation in map area; it is a light-pink, partly welded dolomite and limestone; generally thick of part of the Sevier Desert, Millard County, I 10.5-10.8 Ma thick. Qla undifferentiated--Mixed and reworked, The views and conclusions contained in this document Tht Tuff of Holden 0-200? 0-60? Sevier County downthrown side; arrows show relative tuff with abundant pumice and lithic bedded and forms ledges and cliffs; used Mutual Formation--Pale-red to maroon 6. Hintze, L.F., 1984, Geology of the Cricket Utah: Utah Geological and Mineral Survey M gravelly lacustrine and alluvial deposits on are those of the authors and should not be interpreted Tfc Fool Creek Conglomerate 0-530 0-160 Age uncertain 5.2 to 15(?) Ma movement on cross section. Alluvium, pre-Lake Bonneville--Lenticular fragments in the Drum and Little Drum where field mapping has not subdivided p-C m quartzite, about 10% of which is quartzite- Mountains, Millard County, Utah: U.S. Special Studies 70, 41 p., scale 1:100,000.

. piedmont slopes; grades from pebbly sand as necessarily representing the official policies, either Qal sand and sandy gravel beds that are pre- Mountains; about 500 feet (150 m) thick Cambrian strata between the Pogonip Group pebble conglomerate; forms cliffs and Geological Survey Open-File Report 84- G Trk Red Knolls Tuff 200 60 36.5 Ma Ar/Ar 3 I Lake Bonneville, but post-QTlf in age; and silt to sandy pebble gravel; generally 0 19. Oviatt, C.G., 1992, Quaternary geology L just west of map area; Ar/Ar age 36.7 to and Ophir Formation on the west side of ledges; thickness about 3,000 feet (915 m) 683, 14 p., plates 1 and 2, scale 1:24,000. express or implied, of the U.S. Government. Volcanic sequence of Dennison Canyon, basal tuff only 36.7-37.1 Ma Ar/Ar O Tdc 500 150 to 12 feet (0-3.7 m) thick, but may be thicker of the Scipio Valley area, Millard and Juab Y located north of Delta but mostly covered 37.1 Ma. the Canyon Mountains into formations; in Drum Mountains and 1,600 to 1,875 feet

R locally. 7. Hintze, L.F., 1991, Interim geologic map Counties, Utah: Utah Geological Survey Tdi Drum Mountains intrusions intrusions by Lake Bonneville deposits (Qlf); 5 feet thickness about 2,000 to 3,000 feet (610- (490-570 m) in northern Canyon Mountains.

A Alternating tuffs and volcanic NORMAL FAULT

I Little Drum Formation--Interbedded of the Oak City South quadrangle, Millard Special Study 79, 16 p., scale 1:62,500. conglomerates (1.5 m) are exposed; complete thickness Basalt of Ice Springs--Contains 2 percent 915 m). T Inferred and delineated from geophysical data; andesitic tuffs and conglomerates that Inkom Formation--Greenish- or reddish- County, Utah: Utah Geological Survey

R unknown. Tld

E 1,500- 37.6 Ma Ar/Ar concealed; bar and ball on downthrown side. Qvb1 phenocrysts and has a greater glass content 20. Oviatt, C.G., Sack, Dorothy, and Felger, E Tld Little Drum Formation 450-708 contain volcanic and quartzite clasts in Upper Cambrian, undivided--On cross p-C i gray, phyllitic shale with minor quartzite Open-File Report 217, scale 1:24,000; N 2,325 than other lavas in the Black Rock Desert; T.J., 1994, Quaternary geologic map of the T 38.4 Ma Ar/Ar E Younger alluvial-fan deposits--Poorly sorted various proportions; twelve members were -C u sections only; for included units see beds; generally poorly exposed along strike modified by L.F. Hintze, 1997, unpublished

C estimated to be between 4,000 and 660 years Old River Bed and vicinity, Millard, Juab, 36.9 and 37.6 Ma Ar/Ar (reset?) Qaf1 silt, sand, and pebble, cobble, and boulder mapped in the Smelter Knolls West correlation chart and descriptions. valleys in the Canyon Mountains; thickness mapping for this publication, scale 1:24,000; CORRELATION OF GEOLOGIC UNITS O Amygdaloidal flows with gravel deposited by streams, sheetwash, old; may be as much as 200 feet (60 m) and Tooele Counties, Utah: Utah Geological E Tdr Drum Mountains Rhyodacite 2,000± 600± quadrangle where it is from 1,500 to 2,325 275 to 308 feet (84-93 m). also Mitra, Gautam, and Sussman, A.J., pyroxene latite below TEAR FAULT debris flows, and flash floods on alluvial thick just south of the map area. Ajax Dolomite--Light-brown to dark-gray, 1997, Structural evolution of connecting Survey Map 161, 24 p., scale 1:62,500; feet (450-708 m) thick; Ar/Ar ages 37.6 minor modifications by F.D. Davis for this HIATUS AND UNCONFORMITY High-angle fault with strike-slip offset; fans, and in canyons and mountain valleys; Basaltic ash of Pahvant Butte--Gray to black, and 38.4 Ma but overlies Drum Mountains -C a thick-bedded dolomite that forms ledges Caddy Canyon Quartzite--Grayish-orange- splay duplexes and their implications for Cross Tg Green River Formation 0-200 0-60 - publication. dashed where location inferred; dotted where post-Bonneville shoreline in age; 0 to 60 Qva basaltic ash; blown into atmosphere during Rhyodacite. and cliffs; sparse chert and algal pCc pink, medium- to coarse-grained quartzite critical taper - an example based on Section E feet (0-18 m) thick. stromatolites locally present; 966 feet (295 with pebble conglomerate beds in the only Map and Cross Section N concealed, location approximate; arrows show hydrovolcanic eruption when Lake geometry and kinematics of the Canyon 21. Pampeyan, E.H., 1989, Geologic map E 300- Freshwater limestone with oncolites relative movement on map. Bonneville was near its highest level, about Drum Mountains intrusions--Small bodies m) thick. Canyon Mountains; upper four-fifths is Range culmination, Sevier Belt, central of the Lynndyl 30- x 60-minute quadrangle, C Tf Flagstaff Formation 90-750 Older alluvial-fan deposits--Poorly sorted Tdi of dark-gray finely crystalline diorite in the massive, cliff-forming quartzite; lowest fifth O 2,460 silt, sand, and pebble, cobble, and boulder 15,500 years ago; layer of this ash Opex Formation--Gray, thin- to thick- Utah: Journal of Structural Geology, v. 19, west-central Utah: U.S. Geological Survey E Qaf2 Drum Mountains; probably younger than is interbedded, thin-bedded quartzite and

L interbedded in the upper part of Qlm, -C ox bedded, shaly, and bioclastic limestone that p. 503-521, figure 13, scale 1:256,000; and Miscellaneous Geological Investigations Qal1 Qlg gravel deposited by streams, debris flows, Drum Mountains Rhyodacite. phyllite that forms slopes; thickness 1,930 A e commonly 1 to 6 inches (2.5-15 cm) thick; contains trilobites; 670 feet (204 m) thick. Lawton, T.F., DeCelles, P.G., Mitra, Map I-1830, 9 p., scale 1:100,000; and P n and flash floods on alluvial fans, and in feet (585 m). e Qvb1 c 3,000- 915- Yellowish sandstone grading to STEEPLY DIPPING FAULT canyons and mountain valleys above the reworked by waves on east side of Pahvant Drum Mountains Rhyodacite--Dark-red- to Gautam, and Sprinkel, D.A., 1997, Hintze, L.F., 1990, unpublished mapping o Qes Qed Qpm Qsm Qdm Middle Cambrian, undivided--On cross l Qaf1 Qac TKn North Horn Formation Butte. dark-green-weathering, amygdaloidal flows Blackrock Canyon Limestone--Medium- to unpublished mapping, scale 1:24,000, for for this publication, scale 1:24,000. o conglomerate westward Qal2 3,900 1,200 Sense of motion not known or complex; dashed Bonneville shoreline; includes colluvium Tdr - sections only; for included units see

H Cm S and breccias; about 2,000 feet (600 m) thick; dark-gray, silty to sandy, coarse-grained figure 10 in Lawton, T.F., and others, 1997, where location inferred; dotted where concealed. in canyons and mountain valleys; mostly Basaltic tuff of Pahvant Butte--Gray, basaltic correlation chart and descriptions. p-C b 22. Sayre, R.L., 1974, Geology and U Pleistocene and pre-Lake Bonneville in age, age 37.3 Ma. Map unit includes pyroxene limestone; some beds are oolitic or Stratigraphy and structure of the Sevier O Qvt tuff and brown, orange, and yellow thrust belt and proximal foreland basin mineralization of the Church Hills, Millard Qvt Qva Qlk E but locally includes younger material; up palagonite comprise the volcanic cone of latite of Black Point; about 1,000 feet (300 Cole Canyon and Bluebird Dolomites, peletoidal; locally the limestone forms ledgy County, Utah: Utah Geological Survey

Qgt Qds Qdg Qdf Qlg Qlf Qll Qlm Qla C Qls to 200 feet (60 m), or more, thick. m) thick, with anomalous 50 Ma K-Ar age. -C cb undivided--Medium-gray to light-brownish- outcrops, but it typically forms brush- system in central Utah: Brigham Young A Pahvant Butte; deposited during Special Study 47, 22 p., scale 1:7,000; and e t T LATE STAGE THRUST gray, thick-bedded, mottled dolomite with covered slopes; thickness from about 150 University Geology Studies, v. 42, part 2, a ? ? 790- 240- THRUST FAULT hydrovolcanic eruption in Lake Bonneville Green River Formation--Light-brown, Hintze, L.F., 1991, Interim geologic map

Qms E L Kc Canyon Range Conglomerate Alluvium and colluvium, undifferentiated interbeds of dark-gray dolomite that contain feet (45 m) in the northwestern part to 610 p. 33-67, figure 10, scale 1:94,000. Y 4,500 1,370 R Dashed where location inferred; about 15,500 years ago, when lake was near calcareous sandstone, oolitic limestone, and of the Duggins Creek quadrangle, Millard R Quartzite clast, carbonate clast, and Qac --Mixed alluvial and colluvial deposits that Tg feet (186 m) in the southern part of the C small, white, dolomite rods or flecks; 536

A Qal ? Qvc 3 mixed clast deposits dotted where concealed, location approximate; its highest level; up to about 600 feet (180 cherty limestone that forms ledges in low 8. Hintze, L.F., 1991, Interim geologic map County, Utah: Utah Geological Survey N consist of fluvially reworked, coarse-grained feet (164 m) thick. Canyon Mountains. R Q Qvb3 Qaf barbs on upper plate; arrows show m) thick. hills at south end of Valley Mountains; of the Scipio North quadrangle, Millard and Open-File Report 224, scale 1:24,000; minor E 2 colluvium and/or alluvium with a significant e T MAJOR UNCONFORMITY relative movement on cross sections. about 200 feet (60 m) of this upper part of Herkimer, Dagmar, and Teutonic Pocatello Formation--Upper Pocatello is Juab Counties, Utah: Utah Geological modifications by L.F. Hintze, 1997. . n A ? ? ? colluvium component; includes talus; Basaltic cinders--Basaltic cinders ejected P

e Pc Cherty dolomite near Holden 100+ 30+ U - Survey Open-File Report 219, scale c the formation is exposed in southeast corner Formations, undivided--Interbeds of dark- interbedded phyllitic siltstone, shale, and e ? Cht - l HIATUS mapped in and along the Canyon Mountains, pCp Q o Qvc from a volcanic vent about 4 miles (6.4 km) 23. Tucker, L.M., 1954, Geology of the t d Qvb Dc Cove Fort Quartzite 250 77 of map area. to medium-gray limestone mottled with quartzite about 800 feet (245 m) thick that 1:24,000. s 3 d i i Pahvant Range, Valley Mountains and in south of Pahvant Butte; middle or late Scipio quadrangle, Utah: Columbus, Ohio N e l M ? northeast corner of quadrangle; generally light-olive-gray dolomite, white laminated forms slopes and strike valleys; middle part A P Dgu Upper Guilmette Formation 774 236 Pleistocene in age; less than 30 feet (10 m) Flagstaff Formation--Interbedded, pinkish- 9. Hintze, L.F., 1991, Interim geologic map State University, Ph.D. dissertation, 360 p., I ATTENUATION FAULT 0 to 50 feet (0-15 m) thick, but may be dolomite, and oolitic and oncolitic is white, dense quartzite that contains cross-

N thick. Tf weathering limestone, sandstone, siltstone, of the Holden quadrangle, Millard County, scale 1:31,680; modified by Hintze, L.F., ? ? ? ? Younger over older rocks with strata thinned limestone; at least 1,000 feet (300 m) thick; beds and pebble conglomerates and forms O thicker locally. ? ? ? mudstone, and conglomerate; size and Utah: Utah Geological Survey Open-File 1991, Interim geologic map of the Scipio

V Basalt of Deseret, Pot Mountain, Sunstone base not exposed where mapped in northern resistant hogbacks and ledges; about 1,310 Qvb5 Lower Guilmette, Simonson, or cut out between; present in Drum Mountains; percentage of clastic material generally Report 225, scale 1:24,000. South quadrangle, Millard County, Utah: E Dss 2,720 830 Light-gray dolomite Mass movements, slides, and slumps-- Qvb Knoll, Smelter Knolls, and Pahvant Butte Pahvant Range. feet (400 m) thick; lower shale described y and Sevy equivalents barbs on upper plate; dotted where concealed. 3 l D increase westward in the northeast part of Utah Geological Survey Open-File Report r Qms Masses large enough to show on this map 10. Hintze, L.F., 1991, Interim geologic

a --Basalt flows of probable middle and late by Holladay (1984) on steep dip slope south the map area; thickness 1,300 to 2,460 feet Ophir Formation--Upper half is thin-bedded 218, scale 1:24,000, and L.F. Hintze, 1997, E are found north of Horse Canyon and in

. Pleistocene age; 0 to 1,000 feet (0-300 m) of mouth of Fool Creek Canyon is 590 feet map of the Mills quadrangle, Juab County, QTaf QTt QTas QTlf QTln (395-750 m) in Canyon Mountains and limestone that contains interbeds of olive unpublished mapping for this publication, L 832- Cherty dolomite Oak Creek Canyon in the Canyon -C op I thick. (180 m) thick, but Mitra and Sussman (1997) Utah: Utah Geological Survey Open-File Sl Laketown Dolomite 254-333 northern Valley Mountains, and 300 to 585 shale near the base and top; the upper shale scale 1:24,000, using unpublished ? S 1,092 Mountains, the Scipio Pass quadrangle, questioned the identity of these rocks; total Report 226, scale 1:24,000; includes . LINEAMENT north of Lone Cedar Pass in the Valley Basalt of Crater Bench--Only the southern feet (90-190 m) thick in Cricket Mountains. contains Ehmaniella trilobites; the lower reconnaissance mapping by T.F. Lawton, N Fish Haven Dolomite 138-261 42-79 thickness at least 2,100 feet (645 m). modifications to mapping by Oviatt (1992) U Ofh Aligned sinkholes in Scipio Valley. tip of this basalt flow is in northern Millard shaly interval bears Glossopleura trilobites. New Mexico State University, in 1996. A Mountains, and in the Drum Mountains; Qvb5 e . ? ? ? ? ? ? I Eureka Quartzite 180-394 54-120 North Horn Formation--Predominantly drawn at 1:24,000 scale on this map. n Oe County, where it is 20 feet (6 m) thick; K- Lower half is sandy siltstone, and white, C e masses north of Horse Canyon and in the M yellowish-gray sandstone with interbeds of 24. Tucker, L.M., 1954, Geology of the I c Toc Tcb,Tqb Ar date 0.95 ±0.1 Ma (early Pleistocene). TKn red, and brown quartzite with Skolithos 11. Hintze, L.F., 1991, Interim geologic o i V Scipio Pass area may include older l siltstone, mudstone, conglomerate, and Scipio quadrangle, Utah: Columbus, Ohio .

P map of the Coffee Peak quadrangle, Millard ? O Op Pogonip Group 1,684 513 tectonically emplaced blocks; small, isolated Fine-grained lacustrine deposits of Sevier limestone; proportion of conglomerate tubes; total thickness 1,080 feet (329 m). State University, Ph.D. dissertation, 360 p., W D County, Utah: Utah Geological Survey

O slides or slumps are present in many Tr ? R QTlf Desert--Brown and light-olive-gray, decreases eastward from Canyon Mountains Lower Cambrian, undivided--On cross scale 1:31,680; modified by Hintze, L.F., L syncline overturned syncline Open-File Report 227, scale 1:24,000. O mountainous areas, but are too small to calcareous, lacustrine silt and silty clay with to Valley Mountains; maximum thickness -C l sections only; for included units see 1991, Interim geologic map of the Scipio Tbsk -Ca Ajax 966 ft In Canyon Mts. FOLD AXES show at 1:100,000 scale; up to 200 feet (60 minor sand; offshore to deep-water is in northern Canyon Mountains, where it correlation chart and descriptions. 12. Hintze, L.F., 1990, unpublished mapping Lake quadrangle, Millard County, Utah: R Dolomite (295 m) Crepicephalus

E Upper and Middle m) thick. Unconformity Arrows on axes show plunge. sediments; Pliocene to middle Pleistocene is more than 3,900 feet (1,200 m) thick; for this publication, scale 1:24,000. Utah Geological Survey Open-File Report e P Tintic Quartzite--White and light-brownish- n Tse Opex 670 ft -Cum Cambrian strata, 1,600 490

P in age; 0 to 870 or more feet (0-265+ m) thins to south to about 3,000 feet (915 m) 228, scale 1:24,000. e -Cox Eolian sand--Windblown sand in sheets, - SOURCE LIST FOR GEOLOGIC

m 13. Hintze, L.F., 1991, unpublished mapping c Formation (204 m) undivided Ct gray, dense, vitreous quartzite that weathers Tht U o Tvs u thick. thick in northern Pahvant Range. i 50 45 Qes low irregular mounds, shrub-coppice dunes, pale-reddish-brown; exposed on west side MAPPING (Numbers correspond to for this publication, scale 1:24,000. 25. Turley, C.M., and Nash, W.P., 1980,

C Cole Canyon- 536 ft - M -Ccb and narrow northeast-trending ridges that those on index map below) Unconformity Bluebird Dol. (164 m) Pierson Nearshore lacustrine limestone of Sevier Cretaceous strata (Pre-North Horn of Canyon Mountains near Oak City where Petrology of late Tertiary and Quaternary

Y 14. Hintze, L.F., and Oviatt, C.G., 1993, ? Herkimer- -Cmp 803 243 In Drum Mts. inclined vertical overturned horizontal are largely stabilized by vegetation; mostly Desert--Light-gray limestone and Formation)--On cross sections only. volcanism in western Juab and Millard R ? QTln K it is so completely deformed that its N Tfc E 1,000+ ft Cove Formation Geologic map of the Smelter Knolls West A - Dagmar-Teutonic I Cht silty, well-sorted, fine-grained quartz sand; A L STRIKE AND DIP OF BEDDING conglomeratic limestone that comprise the thickness is not accurately known; estimated counties, Utah, in Smith, Martha, editor, T

? I Wheeler-Swasey- 853- e Fms (300+ m) Elrathia quadrangle, Millard County, Utah: Utah

D - n R Cww 260-375 0 to 10 feet (0-3 m) thick. Larger blow- 1. Davis, F.D., 1994, Geologic map of the

R shoreline facies of QTlf; only exposed in to be about 3,000 feet (950 m) thick. Studies in late Cenozoic volcanism in west-

e Whirlwind Fms 1,230 E

D Ehmaniella Canyon Range Conglomerate--Synorogenic Geological Survey Map 148, 21 p., scale c

Trk B

T outs shown as closed depressions on map. McCornick quadrangle, Millard County, I Ophir 1,080 ft McCornick quadrangle; 20-30 feet (6-9 m) central Utah: Utah Geological and Mineral o -Cop g Dome-Chisholm- 60 deposit of interbedded quartzite-clast, Mutual Formation--Maroon, dark-red, 1:24,000. M

i Kc

M Utah: Utah Geological Survey Map 165, l (329 m) Glossopleura Tdc Formation -Cdh 731-835 222-255 Eolian dunes--Chiefly barchan, parabolic, exposed. Survey Special Study no. 52, p. 1-33, scale A O Howell Fms carbonate-clast, and mixed-clast boulder to p-C m purple, and light-brown, dense, vitreous 13 p., scale 1:24,000. 15. Holladay, J.C., 1984, Geology of the ~1:70,000; modified by L.F. Hintze, 1988, ? C inclined vertical Qed dome, and transverse sand dunes that are Sevier River deposits in Mills Valley-- pebble conglomerate in a sandy matrix; quartzite, grit, and pebble conglomerate; Tld - northern Canyon Range, Millard, and Juab unpublished mapping for this publication, Tdi Cp Pioche Fm 415-800 127-245 Trace fossils STRIKE AND DIP OF PLANAR FEATURES active and not stabilized by vegetation; QTas Moderately well-sorted sand, gravel, and upper half is locally thrust over lower half; exposed on the west side of Canyon 2. Davis, F.D., 1988-1991, unpublished e Counties, Utah: Brigham Young University scale 1:24,000. R n Tdr ? Tintic 3,000± ft mostly tan, well-sorted, fine-grained quartz mud of mixed sedimentary and volcanic as much as 4,470 feet (1,360 m) thick in Mountains where it is locally structurally mapping of surficial geology of the Sevier e - IN VOLCANIC ROCK E Ct Geology Studies, v. 31, part 1, p. 1-28, scale c Quartzite (950± m) sand; also silt dunes downwind from playas; clasts derived from the Sanpete Valley- Canyon Mountains, and 792 to 3,100 feet interleaved with the Tintic Quartzite; Desert valley areas for this publication, o Shown at Smelter Knolls. Major unconformity W 1:24,000; modified by L.F. Hintze, 1996- E Prospect 3 to 35 feet (1-11 m) thick. Marysvale area; 0 to more than 20 feet (6 (241-950 m) thick in northern Pahvant estimated thickness as much as 1,500 feet scale 1:24,000; includes bedrock in The O - 2,760- 835- Pink and 1998, unpublished mapping for this Subsurface data (Only used on cross L Cpm Sink quadrangle. Tg Tg Mountain 4,000 1,200 Playa mud--Laminated, silty fine sand, silt, m) thick; early Pleistocene to Pliocene in Range. (450 m); 1,600 to 1,875 feet (500-570 m) Quartzite orange publication, scale 1:24,000; also Lawton, sections): e and clayey silt infused with various salts, age. Includes poorly sorted calcareous sand thick in the Canyon Range thrust plate where 3. Dommer, M.L., 1980, Geology of the n Tf Tf quartzite Qpm Jurassic strata--On cross sections only. T.F., DeCelles, P.G., Mitra, Gautam, and

e and silt to silty clay (QTab of Oviatt, 1992). it is least deformed. Coogan, J.C., and DeCelles, P.G., 1996, c Mutual gypsum, and calcium carbonate; thickness J Drum Mountains, Millard and Juab Sprinkel, D.A., 1997, unpublished mapping, o p-Cm 1,500± ft Extensional collapse along the Sevier Desert e Unconformity probably 20 feet (6 m) or less. Counties, Utah: Brigham Young University l Formation (450± m) BLOWOUT Quaternary-Tertiary alluvial-fan deposits- CAMBRIAN AND PRECAMBRIAN scale 1:24,000, for figure 10 in Lawton, a Red and maroon reflection, northern Sevier Desert basin,

P Geology Studies, v. 27, part 3, p. 55-72, Closed depressions in Sevier Desert Marsh deposits associated with springs-- QTaf -Poorly sorted silt, sand, and gravel, STRATA IN THE DRUM AND CRICKET T.F., and others, 1997, Stratigraphy and TKn TKn - Mutual 1,600- quartzite Navajo Sandstone--On cross sections only. scale 1:40,000; modified by L.F. Hintze, western United States: Geology, v. 24, p. pCm Formation 3,000 490-915 due to eolian deflation. Gray to black, organic silt, clayey silt, and including boulders, that have, locally, a MOUNTAINS, AND ON THE CANYON structure of the Sevier thrust belt and . Qsm Jn 933-936. T Unconformity Not exposed calcic soil with a stage IV carbonate RANGE THRUST PLATE 1990, unpublished mapping for this proximal foreland basin system in central E sandy silt near the Fool Creek Reservoirs; publication, scale 1:24,000; also Nutt, C.J., R probably 0 to 20 feet (0-6 m) thick. morphology (early Pleistocene age) near Utah: Brigham Young University Geology DeCelles, P.G., Lawton, T.F., and Mitra, C K Kc p-Ci Inkom Fm 275-308 84-93 Phyllitic shale the top of the deposit; 0 to 300 feet (0-90 Triassic strata--On cross sections only. Upper and Middle Cambrian strata, and Yambrick, R.A., 1989, Preliminary Studies, v. 42, part 2, p. 33-67, figure 10, Gautam, 1995, Thrust timing, growth of C - undivided--Medium- and dark-gray, thick-

I Cum Major unconformity Glacial till--Unsorted mixtures of clay, silt, m), or more, thick. TR geologic map showing igneous-related scale 1:94,000; most surficial geology from structural culminations, and synorogenic . White quartzite MASS MOVEMENT SCARP O N bedded dolomite and limestone with a R Caddy Canyon sand, and angular pebbles, cobbles, and breccias in Cambrian and older quartzites, Hintze, L.F., 1991, Interim geologic map Z Paleozoic sequence Qgt sedimentation in the type Sevier orogenic A - Only shown in Oak Creek Canyon U pCc 1,930 585

I Travertine in Canyon Mountains--Tan to sequence of olive shale and thin-bedded

J J Jn O above is part of Quartzite boulders in Pahvant Range; probably late Drum Mountains, Utah: U.S. Geological of the Fool Creek Peak quadrangle: Utah belt, western United States: Geology, v. 23, R Quartzite and in Canyon Mountains. . R Wisconsin (Pinedale) in age; 0 to 200 feet QTt brownish-orange, thin-bedded travertine in Permian strata--On cross sections only. limestone about 40 feet (12 m) thick in Survey Open-File Report 89-99, scale

B the parautochthonous

R Geological and Mineral Survey Open-File p. 699-702. TR E phyllite

T Whiskey Creek of the Canyon Mountains; P upper part; this shale-limestone sequence

T 1:12,000. M Pavant thrust plate. Blackrock Canyon (0-60 m) thick. Report 220, scale 1:24,000. . O 0 to 140 feet (0-43 m), or more, thick. contains sparse Crepicephalus zone (lower A p-Cb 150-610 45-186 P P Pc Algal limestone

R Limestone C Deltaic mud--Holocene mud in the Sevier Upper Cambrian) trilobite fragments; used P E Tertiary volcanic and sedimentary units, Cherty dolomite near Holden--Light-gray, Unconformity Quartzite and TOPOGRAPHIC ESCARPMENT Qdm River delta at the northeastern end of the for Cambrian strata above the Wheeler Shale E R undivided--On cross sections only; for Pc cherty dolomite; folded and silicified; . phyllite Tvs P T Only shown along Sevier River Sevier Lake playa; likely 0 to 30 feet (0-9 in the northern Canyon Mountains; total S

M A Pocatello included units see correlation chart and probably structurally related to MAP AREA S p-Cp m) thick. I 2,100+ 645+ thickness about 1,600 feet (490 m). Exposed L Formation north of Delta. descriptions. parautochthonous thrusted rocks on the M Quartzite Minor unconformity thickness 353 to 1,300 feet (107-360 m). Underflow-fan deposits--Thin-bedded to southeast flank of the Pahvant Range south K T T A Oak City Formation--Sandy, bouldery . S S Y Qdf laminated, calcareous silt with minor E T E E Dc of this map; exposed thickness about 100 Middle Cambrian, undivided--On cross S L E E A P Toc gravel, poorly to well cemented; forms T O K W E L N interbedded very fine sand in thin beds that O H S A N L feet (30 m). -C m sections only; for included units see M L I A A L R E R G L L L I Cambrian-Precambrian sequence above dissected alluvial apron on west and south- A T Y V Minor unconformity DEEP EXPLORATION WELL were deposited in the Lake Bonneville deltas M L E IN N Y P N correlation chart and descriptions. U E M T K I D D E comprises the Canyon Range thrust plate west sides of Canyon-Pahvant-Range fault Mississippian strata--On cross sections only. R U R A N N M G O D Map symbol on left, W U A A of the Sevier River; 0 to 64 feet (0-20 m) D F B B P R N N A V S 132 H Dgu and strata in the Drum Mountains. block; base not exposed; contains landslide M Pierson Cove Formation--Dark-gray, Y LY S E cross section symbol on right. thick. L C D blocks (-C op and Tf at Red Cedar Hill, 7 -C mp medium- to thick-bedded limestone that 2,3 4,20 20 2 2 2,21 2,5 Dss Deltaic sand--Moderately sorted, fine to miles (11 km) south of Holden, and Tqb rarely contains trilobites; 803 feet (243 m) 39°30' 39°30' Diagram is schematic--- no fixed thickness scale Devonian, undivided--On cross sections Millard Co. Juab Co. Minor unconformity Qds coarse sand in a single exposure along I-15 and Tcb in the hills south of Oak City); es- thick in the Drum Mountains. 6 only; for included units see correlation chart D K

. D T in Juab County 2 miles (3 km) north of the timated thickness 0 to 2,000 feet (0-600 m). R R T N E Y E L S S A N G E I VOLCANIC VENT and descriptions. Wheeler-Swasey-Whirlwind Formations, E E L IT S Sl Millard County line; contains Pahvant Butte T E T A N R S L L E R A O C H L Quartzite breccia slide blocks within Oak - W E T T C K IL basaltic ash (15,500 years); deposited at Cww undivided--Listed from top downward. E S E S L R K R L A Cove Fort Quartzite--Interbedded pale- M L M L H E T A E M SO Minor unconformity L T S O O P Tqb City Formation--Quartz-cemented breccia Wheeler Shale is olive, platy, calcareous S L S U D O N O margin of Lake Bonneville by overflow orange sandstone, sandy dolomite, and O O F Qlf/QTaf of angular blocks of Tintic Quartzite; as Dc shale that is 910 feet (277 m) thick in the N N S Ofh from lake in Scipio Valley; 23 feet (7 m) K K 15 N quartzite; only exposed south of Little Oak

A much as 400 feet (120 m) across near Drum Mountains and only about 100 feet 14 18,25 18 18 2 2,15 2,15 10 I Indicates thin cover thick. Canyon in the Canyon Mountains; 250 feet C Minor unconformity I bedrock source diminishing to 50 feet (15 (30 m) thick in the Canyon Mountains. Delta

V of the first unit overlying (77 m) thick. Deltaic sand and gravel--Deposited at the m) 2.5 miles (4 km) to the west. Swasey Limestone is dark-gray, massive, K O E Oe the second unit. L K A H D D WEST EAST D' apexes of deltas of the Sevier and Beaver L E T Qdg Upper Guilmette Formation--Brownish- cliff-forming limestone that is about 180 A Y G Y R O Carbonate breccia slide blocks within Oak O L E T P R N L A N I S O O Rivers in Lake Bonneville then distributed T I Op METERS Dgu gray, sugary dolomite that forms cliffs on feet (55 m) thick in the Drum Mountains K S K L C H N Cricket Mountains City Formation--Carbonate-cemented T C D T M FEET by waves and currents; consists of silty, Tcb Y F E R K U A O the east side of the Canyon Mountains south and 614 feet (186 m) in the Canyon A N D A A I I A I O L P - Chevron Cominco SHORELINES breccia of angular blocks of Cambrian L R H 257 H O S L I Ca 2,500 8,000 fine- to coarse-grained sand and gravel; 0 of Little Oak Canyon; thickness 774 feet Mountains. Whirlwind Formation is olive C C I C Black Rock limestone and dolomite; as much as 2,000 W S -C u West Cricket fault zone East Cricket fault zone well 80-3 Dotted where obscure; to 24 feet (0-7.3 m) thick. (236 m). shale and thin-bedded limestone that bears 2,000 well 96-1 projected 1.5 mi feet (600 m) thick near bedrock source 12,18 18 18 18 2,7 2,7 17 8,19 ? -C ox Tf Tf Q queried where conjectural. Ehmaniella trilobites; it is about 140 feet Sevier Lake Q Q (2.4 km) south 6,000 Lacustrine gravel--Shore-zone gravel of diminishing to 30 feet (10 m) 3.0 miles (5 Lower Guilmette, Simonson, and Sevy -C um Q (43 m) thick in both the Drum and Canyon -C um 1,500 G Lake Bonneville, Lake Gunnison, and Sevier 6 E K Qlg km) to the west. equivalents, undivided--Light-olive-gray, L N T -C cb Dss Mountains. L I K E S H -Cm - 4,000 Lake; chiefly silty, fine- to coarse-grained 50 A E T E S 50 T N -Cl - Cl Lake Gunnison shoreline thin-bedded, laminated dolomite with a few O T U IC R U 1,000 - Cl Tvs Tvs Pliocene-Miocene N N B A A -C mp Cm -Cl - Rhyolite of Smelter Knolls--White to light- N N C P O I Cl - sand and gravel; gravel of Lakes Bonneville K O Cl sediments reddish-gray, silty dolomite interbeds; Dome-Chisholm-Howell Formations, U T L T H R S S R -C m - -Cl Y O S L T IO -C Cht - - 2,000 P Tr gray, devitrified rhyolite containing less O N R O N O B - 500 Cl Cl and Gunnison is late Pleistocene; gravel of unfossiliferous; 2,720 feet (830 m) thick. - undivided--Listed from top downward. K M N A C 50 I IP I Cww 2,480' Pre-Tvs Cdh C U N V O G IP M than 20 percent small phenocrysts of quartz T C C - p-C p-C p-C Provo shoreline Sevier Lake is Holocene; generally 0 to 30 O S K H N G S C A - p-C pC - Dome Limestone forms massive cliffs and O M - pC pC erosion surface and feldspar; Smelter Knolls are small R P A U S C -C dh Cop Sea level Sea level of Lake Bonneville feet (0-9 m) thick. Silurian-Upper Ordovician, undivided--On P D - extrusive domes about 100 feet (30 m) high; is about 300 feet (90 m) thick in the Drum 13,18 18 18 18 1 2,22 2,16 19,23 pC p-C SO cross sections only; for included units see Mountains and 180 feet (55 m) thick in the -C p -C t -500 B Lacustrine sand--Fine- to coarse-grained age 3.4 Ma. Canyon Range thrust 2,000 correlation chart and descriptions. Canyon Mountains. Chisholm Formation -C l 7,900' Qls sand, marly sand, and pebbly sand deposited E -Cl Bonneville shoreline T K -C pm -1,000 Sevier River Formation--Light-gray, Laketown Dolomite--Medium- to dark-gray, is interbedded, thin-bedded, fossiliferous E T A E Pavant thrust 8,450' Canyon Range thrust 8,390' of Lake Bonneville in Lake Bonneville as beaches, spits, and S K U K E K -4,000 S S A B N N A yellowish- or greenish-gray, poorly to Sl thick-bedded, cliff-forming, cherty dolomite; (Glossopleura) limestone and olive shale, A L I E P L M -Cu offshore bars; 0 to 30 feet (0-9 m) thick. Tse L H S D Minor unconformity -1,500 P E R T T E O 9,650' moderately sorted mudstone, sandstone, thickness 832 to 1,092 feet (254-333 m). and is 205 feet (62 m) thick in the Drum E N E L E I Pavant thrust 10,680' D A U O F P E N E A O H F I - -6,000 Lacustrine carbonate sand--Lacustrine sand conglomerate, and carbonaceous mudstone; Mountains and 247 feet (75 m) thick in the R L V T H C N pCm S -2,000 -C m Fish Haven Dolomite--Medium-dark- C H O S A A C I TR Qlk and pebbly sand that consists of white and only exposed in small outcrop in southeast Canyon Mountains. Howell Limestone P R p-C i -8,000 Note: "Pavant" and "Pahvant" are light-gray carbonate pellets, carbonate- Ofh brownish-gray, fine-grained dolomite; 6,18 6,18 18 18 2 2,9 2,11 19,24 B - corner of map area in Sevier County; forms a massive cliff and is 330 feet (101 -2,500 13,850' Cl TD 13,193 ft generally chertless; thickness 138 to 261 39° 39° M J both used in this document. "Pahvant" coated gastropods, and ooids deposited in extensively exposed to east, where it is m) thick in the Drum Mountains, 303 feet 113° 112° A p-C p-C c 14,560' feet (42-79 m). C -3,000 Jn -10,000 is now the accepted spelling for Lake Bonneville; generally 0 to 10 feet (0- probably more than 600 feet (180 m) thick; (92 m) thick in the Canyon Mountains, and E Thin Q deposits are omitted locally Index map showing sources of geologic mapping and 7.5-minute quadrangles. R p-C b 16,270' fault geographic features. "Pavant" 3 m) thick. fission-track date 5.2 Ma on upper part of Middle and Lower Ordovician, undivided- about 360 feet (110 m) thick in the northern

P -3,500 on cross section for clarity. - Cl -12,000 usage is for geologic features formation, but base of formation dated at -On cross sections only; for included units Cricket Mountains. p-C p TD 17,477 ft O -4,000 named in publications. about 15 Ma by fission-track methods. see correlation chart and descriptions.

C WEST EAST C' B WEST EAST B' METERS Pahvant Range Anschutz- FEET TKn Maple Monroe well Valley FEET 3,000 10,000 METERS Grove Pahvant Scipio Lake 76-1 Mts. Henley Canyon Mountains Canyon Valley Mountains Range projected 3,000 10,000 2,500 Pahvant Valley Kc fault graben Tf 8,000 well 81-1 Range -C u fault 2 mi (3 km) projected p-C p Canyon Tf Tf McCornick Q 2,500 thrust Scipio Valley 8,000 2,000 4 mi (6 km) Q - fault Q Q -C m TKn TKn 6,000 Toc Cpm Q Range Scipio Q Q Q Pc QTaf TKn 2,000 north p-C i D fault 1,500 Toc Kc Tvs Q D Q/QTaf Q/QTaf TKn Tf 6,000 Toc - - TKn Cl -C u K 4,000 1,500 -C op pCm SO SO TKn 1,000 ? Concealed normal faults TKn p-C c Jn Pava 3,290' K Tvs TKn TKn TKn 4,000 Tvs nt thru repeat east-dipping T and K K 1,000 1,760' unconformity O K 500 TR st -C 2,000 -C t O K K This area is probably underlain by imbricately thrusted Paleozoic and Mesozoic strata in complex structures similar to those -C m strata under this valley. K J -C um K K K O Pavan 2,000 500 Structure unknown - - D ? t thrus Sea level exposed along the west base of the Pahvant Range between Fillmore and Kanosh. See adjoining map to the south. 6,110' unconformity Sea level 3,500' pCb Cum t Paleozoic -C SO Paleozoic ? Paleozoic 7,200' -C um - SO O Mesozoic Pavant thrust Sea level Cop ? Sea level -500 -2,000 -C u & -C m O J Pavant -500 -C op -C t -1,000 thrust 7,470' thrust -2,000 -4,000 -1,000 -1,500 O Structure uncertain TR -C t -4,000 -6,000 -1,500 -2,000 P - - -6,000 -2,000 Cu & Cm -2,500 M -8,000 Thin Q deposits are omittted locally on cross section for clarity. Thin Q deposits are omittted locally on cross section for clarity. D -C l 13,080' -8,000 -2,500 TD 13,106 ft -3,000 TD 15,369 ft 10,000

A WEST EAST A' METERS Drum Northern Sevier Desert Canyon Mountains FEET 2,500 Mts. ? - Drum Mountains fault zone Argonaut Cdh -C ww Mills Valley 8,000 Old River Bed well 78-1 Sevier 2,000 Intermountain Kc QTaf QTaf Sevier River Tg - Q Q Q IPP Power Plant Q River -C ww Q/QTas 6,000 Cl -C um -C dh 1,500 -C p p-C m - ? Tf 4,000 1,000 Cm -C m Early Quaternary-Pliocene deltaic deposits of Sevier River Lynndyl-Leamington bench Kc Tf ? Tg? Thin Pliocene-Miocene alluvial deposits Thick Pliocene-Miocene basin-fill deposits-- 2,550' p-C p -C pm -C pm TKn ? 500 p-C Pre-Tvs mostly sand, silt, and gravel with a few Pliocene-Miocene basin deposits Pliocene-Miocene Pliocene-Miocene 2,000 Miocene ? ? - -C l erosion local basalt flows ? of sand, silt, clay, and gravel ? basinal deposits ? basinal deposits Cdh TKn Sea level -C l and upper ctor - Kc Sea level surface ? ? refle -C ww -C p pCc Oligocene Desert -500 -C l-p-C ? ? -C l-p-C ? -C l-p-C ? salt and gypsum Sevier p-C b -C um ? 7,734' SO? -2,000 p-C Tvs -1,000 ? Probably Cambrian and Precambrian strata - Altered Cambrian pCc O? Kc p-C Argonaut well is Paleozoic strata -4,000 -1,500 Thin Q deposits are omitted locally carbonate rocks ? on a major gravity low Canyon Mountains structure p-C i p-C m -C um? on cross section for clarity. TD 11,226 ft -6,000 -2,000 Additional down-to-east faults are likely here in subsurface on east side of Drum Mountains block. under the Sevier Desert. Subsurface fault pattern after Coogan and DeCelles (1996) modified from DeCelles and others (1995) Canyon Range thrust