U.S. Department of the Interior National Park Service Natural Resource Stewardship and Science Directorate Geologic Resources Division Organ Pipe Cactus National Monument GRI Ancillary Map Information Document Produced to accompany the Geologic Resources Inventory (GRI) Digital Geologic Data for Organ Pipe Cactus National Monument orpi_geology.pdf Version: 5/27/2021 I Organ Pipe Cactus National Monument Geologic Resources Inventory Map Document for Organ Pipe Cactus National Monument Table of Contents Geologic Resourc..e..s.. .I.n..v..e..n..t.o...r.y.. .M...a..p.. .D...o..c..u..m...e..n...t............................................................................ 1 About the NPS Ge..o..l.o..g..i.c... .R..e..s..o..u...r.c..e..s.. .I.n..v..e..n...t.o..r.y.. .P...r.o..g...r.a..m............................................................... 3 GRI Digital Map an...d.. .S..o..u...r.c..e.. .M...a..p.. .C...i.t.a..t.i.o...n...................................................................................... 5 Index Map .................................................................................................................................................................... 5 Map Unit List ............................................................................................................................. 6 Map Unit Descript.i.o...n..s...................................................................................................................... 9 QTal - Alluvi.u..m... .a..n..d.. .c.o..l.l.u..v..i.u..m... .(.H..o..l.o..c..e..n..e..,. .P..l.e..i.s..t.o..c..e..n..e.. .a..n..d.. .P..l.i.o..c.e..n..e..)............................................................................ 9 QTg - Terrac.e.. .g..r..a..v.e..l.s.. .(.H...o..l.o..c.e..n..e..,. .P...l.e..i.s.t.o..c..e..n..e.. .a..n..d.. .P...li.o..c..e..n..e..)........................................................................................ 9 QTls - Lands..li.d..e.. .d..e..p..o..s..i.t.s.. .(.H..o..l.o..c..e..n..e..,. .P..l.e..i.s..t.o..c..e..n..e.. .a..n..d.. .P..l.i.o..c.e..n..e..)................................................................................... 9 Batamote An..d..e..s..it.e.. .C...o..m...p..l.e..x........................................................................................................................................... 9 Tbau - Batamore Andesite Complex, flows, flow breccias, and vent intrusive rocks, undivided (middle Miocene) ............................................................................................................................................................. 9 Tba - Bata..m...o..r.e.. .A..n..d..e..s..i.t.e.. .C...o..m...p..l.e..x.,. .b..a..s..a..l.t.i.c.. .a..n..d..e..s.i.t.e.. .f.l.o..w...s. .a..n..d.. .f.l.o..w... .b..r.e..c..c..ia..s.. .(.m...i.d..d..l.e.. .M...i.o..c..e..n..e..)...................... 10 Tbb - Bata..m...o..r.e.. .A..n..d..e..s..i.t.e.. .C...o..m...p..l.e..x.,. .p..o..r.p..h..y..r.i.t.i.c.. .b..a..s..a..lt. .(..m...id..d..l.e.. .M...i.o..c..e..n..e..)............................................................ 10 Tbai - Bat.a..m...o..r.e.. .A..n..d..e..s..i.t.e.. .C...o..m...p..le..x..,. .v..e..n..t. .i.n..t.r.u..s..i.v.e.. .i.g..n..e..o..u..s.. .(.m...i.d..d..l.e.. .M...i.o..c.e..n..e..).................................................... 10 Tbab - Ba.t.a..m...o..r.e.. .A..n..d..e..s..i.t.e.. .C...o..m...p..l.e..x.,. .v..e..n..t. .b..r.e..c..c..i.a..s.. .(.m...i.d..d..le.. .M...i.o..c..e..n..e..)................................................................ 10 Tsvu - Sedi.m...e..n..t.a..r.y.. .a..n..d.. .v..o..l.c.a..n..i.c.. .r.o..c..k..s..,. .u..n..d..i.v.i.d..e..d.. .(.m...i.d..d..l.e.. .a..n..d.. .e..a..r.l.y.. .M...i.o..c.e..n..e..)........................................................... 11 Rhyolite of .M...o..n..t.e..z..u..m...a..'s.. .H...e..a..d...................................................................................................................................... 11 Tmu - Rhy..o..l.it.e.. .o..f. .M...o..n..t.e..z..u..m...a..'.s.. .H..e..a..d..,. .u..n..d..i.v..i.d..e..d.. .(.e..a..r.l.y.. .M...i.o..c.e..n..e..)....................................................................... 11 Tma - Rhyolite of Montezuma's Head, augite andesite and hypersthene-hornblende andesite of Ajo Range (ea..r.l.y.. .M...io..c..e..n..e..)......................................................................................................................................... 11 Tmv - Rhy..o..li.t.e.. .o..f. .M...o..n..t.e..z..u..m...a..'.s.. .H..e..a..d..,. .r.h..y..o..l.i.t.e.. .o..f. .v..it.r..o..p..h..y.r.e.. .d..i.k..e..s.. .(.e..a..r.l.y.. .M...i.o..c.e..n..e..)............................................. 11 Tmat - Rh.y..o..l.it.e.. .o..f. .M...o..n..t.e..z..u..m...a..'.s.. .H..e..a..d..,. .c..r.y..s..t.a..l.-.l.i.t.h..ic.. .a..s..h..-.f.l.o..w... .t.u..f.f. .(.e..a..r.l.y. .M...i.o..c..e..n..e..).............................................. 11 Tmr - Rhyolite of Montezuma's Head, rhyolite, rhyodacite, and minor dacite flows, flow breccias, and plugs (ear.l.y.. .M...io..c..e..n..e..)........................................................................................................................................... 12 Tmt - Rhy.o..l.it.e.. .o..f. .M...o..n..t.e..z..u..m...a..'.s.. .H..e..a..d..,. .t.u..f.f. .a..n..d.. .t.u..f.f. .b..r..e..c.c..i.a.. .(.e..a..r.l.y.. .M...i.o..c..e..n..e..)........................................................ 12 Tmb - Rhy..o..l.it.e.. .o..f. .M...o..n..t.e..z..u..m...a..'.s.. .H..e..a..d..,. .p..o..r..p..h..y.r.i.t.i.c.. .b..a..s..a..l.t. .o..f. .D..i.a..b..l.o.. .M...o..u..n..t.a..i.n..s. .(..e..a..r.l.y. .M...i.o..c..e..n..e..).......................... 12 Tmd - Rhy..o..l.it.e.. .o..f. .M...o..n..t.e..z..u..m...a..'.s.. .H..e..a..d..,. .d..a..c..i.t.e.. .o..f. .t.h..e.. .A..j.o.. .R...a..n..g..e.. .(.e..a..r.l.y.. .M...i.o..c.e..n..e..)................................................. 12 Tml - Little .A..j.o.. .M...o..u..n..t.a..i.n.. .m...o..n..z..o..g..r.a..n..i.t.e.. .(.e..a..r.l.y.. .M...io..c..e..n..e..)............................................................................................... 13 Tbu - Basa.lt. .a..n..d.. .b..a..s..a..l.t.i.c.. .a..n..d..e..s.i.t.e..,. .u..n..d..i.v..i.d..e..d.. .(.e..a..r.l.y.. .M...io..c..e..n..e..)..................................................................................... 13 Tdu - Dacit.e..,. .u..n..d..iv..i.d..e..d.. .(.e..a..r.l.y.. .M...i.o..c..e..n..e..)....................................................................................................................... 13 Tru - Rhyol.it.e.. .f.l.o..w...s..,. .d..ik..e..s..,. .a..n..d.. .f.e..l.s..i.c. .p..y..r.o..c..l.a..s..t.i.c. .r..o..c.k..s..,. .u..n..d..i.v..id..e..d.. .(..e..a..r.l.y. .M...i.o..c..e..n..e..)..................................................... 13 Ttu - Growl.e..r. .M...o..u..n..t.a..i.n.. .R..h..y..o..l.i.t.e..,. .w..e..l.d..e..d.. .t.u..f.f. .(.e..a..r.l.y.. .M...i.o..c..e..n..e..)...................................................................................... 13 Tdc - Danie..ls.. .C...o..n..g..l.o..m...e..r.a..t.e.. .a..n..d.. .a..s..s.o..c..i.a..t.e..d.. .l.a..k..e.. .d..e..p..o..s.i.t.s.. .(.e..a..r.l.y.. .M...i.o..c..e..n..e..)................................................................ 13 Childs Latit.e.. .a..n..d.. .c..o..e..v.a..l. .p..l.u..t.o..n..i.c.. .r.o..c..k.s.......................................................................................................................... 14 Tcu - Chil.d..s. .L..a..t.i.t.e.. .a..n..d.. .c..o..e..v..a..l. .p..lu..t.o..n..i.c.. .r.o..c..k..s..,. .u..n..d..iv..i.d..e..d.. .(.e..a..r.l.y.. .M...i.o..c..e..n..e..)........................................................... 14 Tcd - Chil.d..s. .L..a..t.i.t.e.. .a..n..d.. .c..o..e..v..a..l. .p..lu..t.o..n..i.c.. .r.o..c..k..s..,. .a..u..g..it.e.. .l.a..t.i.t.e.. .d..i.k..e..s. .(..e..a..r.l.y. .M...i.o..c..e..n..e..)............................................... 14 Tcl - Child.s.. .L..a..t.i.t.e.. .a..n..d.. .c..o..e..v..a..l .p..l.u..t.o..n..i.c.. .r.o..c..k..s.,. .C...h..i.l.d..s. .L..a..t.i.t.e.. .f.l.o..w...s. .a..n..d.. .f.l.o..w... .b..r.e..c..c..ia..s.. .(.e..a..r..ly.. .M...i.o..c..e..n..e..).................. 14 Tca - Chil.d..s. .L..a..t.i.t.e.. .a..n..d.. .c..o..e..v..a..l. .p..lu..t.o..n..i.c.. .r.o..c..k..s..,. .a..u..g..it.e.. .a..n..d..e..s..i.t.e.. .(.e..a..r.l.y.. .M...i.o..c..e..n..e..).................................................. 14 Tcb - Chil.d..s. .L..a..t.i.t.e.. .a..n..d.. .c..o..e..v..a..l. .p..lu..t.o..n..i.c.. .r.o..c..k..s..,. .o..li.v..i.n..e..-.a..u..g..i.t.e.. .b..a..s..a..lt. .a..n..d.. .a..l.k..a..l.i.