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Ordovician and Cambrian Formations of Central Alabama, Showing Different Usages and Equivalents M

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Ordovician and Cambrian Formations of Central Alabama, Showing Different Usages and Equivalents M 20 Ordovician and Cambrian formations of central Alabama, showing different usages and equivalents Alabama Tennessee (U. S. Geological Survey reports) Bessemer- Vandiver folio Birmingham folio Valley and Ridge province System and New York (New York State Alabama series Survey reports) Montevallo-Columbiana Geological Central basin Eastern areas folio Survey Cahaba Valley Birmingham Valley Birmingham Valley Cahaba Valley reports Western areas Knoxville folio Morristown folio [Sevier shale northwest Basal Trenton Trenton fully repre­ [Represented ] of Clinch Mountain= Trenton limestone. represented. [Represented.] sented. Martinsburg shale. Lower part=Trenton.] [Absent.] Ordovician.Middle Amsterdam limestone. Represented. [Represented.] [Not represented.] [Represented?] [Represented?] Watertown Absent. Absent. [Absent.] limestone. Black Bays sand­ River Moccasin stone group. limestone. [typical]. Leray limestone. Represented. [Represented.] Carters limestone. [Represented.] Bays sandstone. Northwest Southeast Lowville lime­ of Clinch of Clinch stone. Mountain. Moun­ tain. _ ?.__. _ ._ __ . ("Pelham")limestone.Chickamauga Sevier shale [typical : Sevier shale south­ Little Oak limestone. Little Oak limestone. 03 Ottosee shale of east of Clinch Chickamaugalimestone. fl Chickamaugalimestone. O Ulrich]. Mountain. -P 00 0> .1 Tellico sandstone not repre­ Not represented. sented. Tellico sandstone. [Not represented.] [Not represent­ a [Probably not Not represented. ed.] ' "a!A [Not represented.] represented.] Ordovician. Athens shale. Athens shale. to Athens shale. Athens shale. Normanskill northwestMountain.ofClinchChickamaugalimestone shale and Val- ("Pelham")limestone.Chickamauga cour lime­ Holston marble mem­ stone. ber of Chicka­ Absent. Absent. mauga limestone. Chazy Lebanon lime­ group. Absent. Pamelia lime­ Ordovician.Lower Absent. stone. stone. PH o Chickamauga lime­ Stones River [Stones River gj, Ridley limestone. stone southeast of group repre­ group repre­ h Clinch Mountain. Lenoir limestone. Lerioir limestone. sented. sented] £ Attalla chert Attalla con­ 2 Pierce limestone. [Stones River Crown Point glomerate Chickamauga lime­ conglomerate GOo> limestone stone. limestone. member at member at a represented.] base. base. £ Murfreesboro QQ limestone. Bot­ Absent. Absent. tom not ex­ posed. Day Point lime­ ? stone. Mosheim limestone. Mosheim limestone. Odenville limestone. Odenville limestone. Absent. [Absent.] Newala limestone. Newala limestone. Beekmantown limestone. ? 1 _____ Longview limestone. Longview limestone. Absent. [Absent.] Knox dolomite. Knox dolomite. Knox dolomite. [Absent except [Chepultepec Chepultepec dolomite Chepultepec dolo­ Absent. in Murphrees dolomite pres­ Chert bed at top of Little mite. Valley.] ent.] Falls dolomite. Ulrich).(Ozarkiansystemof [Copper Ridge -JSJ [Copper Ridge OrdovicianCambrianor Copper Ridge dolo­ Copper Ridge dolo­ dolomite pres­ 'g dolomite pres- dolomite.Knox Copper Ridge dolomite. mite. mite. Knoxdolomite. ent.] 'o£ ent.] t3 f Bibb dolomite. Bibb dolomite. Absent. [Ab&ent.] g [Absent.] M Ketona dolomite Ketona dolo­ Ketona dolomite. Ketona dolomite. Ketona dolomite. member. exposed.lowercroppingoutNorocksor mite member. [Absent.] [Absent.] [Absent.] Hoyt limestone. Brierfleld dolomite. Brierfleld dolomite. Absent. [Absent ] [Absent.] Theresa dolomite. Potsdam sandstone. i Upper Cambrian. Nolichueky shale. Nolichueky shale. Maryville limestone. Maryville limestone. Conasauga ("Coosa") lime­ Conasauga ("Coosa") Conasauga (' Coosa") Coosa (Flat- Rogersville shale. Rogersville shale. Absent. [Absent.] woods) Conasauga shale. stone. limestone. limestone. shale. Rutledge limestone. Rutledge limestone. Middle Cambrian. Montevallo Rome ("Montevallo") for­ Rome ("Montevallo") Horizon not ex­ [Horizon not ex­ Rome ("Montevallo") variegated mation. formation. posed. posed ] formation. shales and Rome formation. Rome formation. Rome formation. sandstones. Cambrian.! Absent (?); may be repre­ sented in Rome forma­ [Absent.] Beaver limestone. tion. Apison shale. Cambrian.Lower Aldrich Lower Cambrian slates, Shady limestone. limestone. [Not represented.] quartzites, and limestones with Poughquag quartz­ [No lower rocks cropping out or exposed.] Not exposed. [Not exposed.] ite at base. Hesse sandstone [or quartzite]. Weisner Murray shale. "Weisner quartzite. sandstone Nebo sandstone. and shale. Nichols shale. Cochran conglom­ erate. GENERALIZED COLUMNAR SECTION OF THE SEDIMENTARY ROCKS OF THE MONTEVALLO AND COLUMBIANA QUADRANGLES SCALE: 1 INCH=1,000 FEET ' THICKNESS SYSTEM SERIES FORMATION SYMBOL SECTION IN FEET MINOR DIVISIONS CHARACTER OF ROCKS AND TOPOGRAPHY riJg=yf oa>S^g^ ; 'o- » (><;b <i-°'?>'°-3.'o'° ? VoV^'^'o^^o"'"^ ' : '° Upper Maylena coal. Lower Maylena coal. rfiS : V.VoSM .-doJo7? Sj9 0i?Vi?.9:-:>?is^?:.Q-°o.<'.o'? Upper Dogwood coal. Lower Dogwood coal. ^/b'.'^-.V'-?;-?.^ V..«^i«»T^:i?3~i«F93| Montevallo coal. ... "jTf^.'.T^i.'r;/.^:^; Yeshie coal. v;::-;/;:;^^;^^ Helena coal. :fr^Vrr-.:Hr:-r:T7^V:v: Straven conglomerate member. Thompson coal. Smithshop coal. Quarry coal. Gholson ? coal. Clark ? coal. Moyer coal. Youngblood coal. ^S¥ ._ -- Buck coal. li * i^^~4^-"^===r_ =, Pump coal. * PENNSYLVANIANo 9180 Pottsville formation. Cpv Shale, sandstone, conglomerate, and coal beds. Sandstone, siliceous and feldspathic (arkosic), thick-bedded, and flaggy. The "TfTTffT.-rrr. TTTT. rrr.-.-. ~ Shades, Pine, and Chestnut sandstone members, which are hard ridge makers, compose the "Millstone Grit " of Alabama. The Aiken coal. shale is generally of clayey composition and of dark color, but some is siliceous. This formation contains nearly all the coals of Alabama, except the lignite of the southern part of the State. ^i , Wadsworth coals. a^^.¥H^7== irfg-ssag Harkness (Big Bone) coal. O DC UJ u. 1 O Nunnally coal, group. CQ DC J O I 7^r--'.-'.:7\\~\:-~:::.~": Chestnut sandstone member. -:.Trrrr-.-. .-. : ;-.-.-.-.-.v^~^ Gould coal. ..... ..........;........ Pine sandstone member. -- -^ V; _.'; =/; :;i'v' -.: Shades sandstone member. - . Brock coal. frrfTTr". ~=^ Park wood formation. Cpw ZZTT-ZZZivZLJi: 1000± Shale and sandstone, predominantly gray, much like the Pottsville formation but without coal. Carries a sparse Mississippian fauna in the lower part and a sparse fauna of Pennsylvanian aspect in the upper part. Generally unfossiliferous. .TTT:: -r=7=r - ' - MISSISSIPPI Mainly dark to black clay-shale including thin layers of argillaceous limestone and a considerable proportion of fine-grained Cf greenish sandstone, apparently in lenticular layers of no great extent. Some gray and finely conglomeratic sandstone. Floyd shale. - '-^j-- -aa- 1200-2000± Fort Payne chert. Gray thick and thin-bedded fossiliferous chert. ^m^^^m^ Rusty and dark sandstone. DEV. L. D, Frog Mountain sandstone. ~~oi7-^ Little Oak limestone. -^^wT' Thick-bedded dark partly eherty, fossiliferous limestone. jS^ESip-p-'e^P-g.'p8'- Athens shale. Oa 200-500 Black fissile graptolitic shale with layers of black argillaceous limestone. z Lenoir and Mosheim (?) lime­ Ol 1 1 1 1 1 / 0-400 Thick-bedded dark medium-grained limestone with clay veins that make a residual network on the weathered surface. Mosheim E3 stones. _ - - limestone is compact, dove-colored, pure, and fossiliferous. ORDOVICIAN o o ce I. «=| 1 => o -S/ V^-r 1 DC UJ Newala and Odenville limestones. On 800-1200 Thick-bedded, compact, light bluish-gray limestone with layers of dolomite and magnesian limestone. Yields very little or no 0 -J-..-I ( .. j , , . chert. Sparingly fossiliferous. Extensively burned for lime. Odenville limestone, at top argillaceous and fossiliferous. [ c=> 1 *=» | 1 1 1 . j | | I 1 1 Longview limestone. Thick-bedded, partly magnesian limestone yielding much rather brittle chert which commonly contains fossils, especially gastro­ Olv 0-400 pods of the characteristic genus Lecanospira, ^/SS^/f x^^s/<a£9 jfl/fe<^yQS39/QS3 <z$££>/s§3 /fe?Od£s/ Chepultepec dolomite. 0c 600-1000± Medium thick-bedded, rather coarse-grained dark bluish-gray dolomite which yields cavernous fossiliferous chert. Locally a con­ C^f&k&yf cbik/ siderable thickness of thick-bedded light bluish-grays compact limestone in basal part. 3y<5£$3/ <yr>£i/£&> 1 1 1 c=i/ c=> /=>c=,/c=< :>/«=,/ ea/CSjr /C=3/C=>0./ CT=3 c=> /C-.CTO/ cro ^3/CDC?/ G^D/CS =/^0/C=-D/cr /=-<=>/ cC^D/cCO Copper Ridge dolomite. 0cr 2000± Thick-bedded, mainly dark bluish-gray dolomite; some light-gray fine-grained dolomite. Yields many large masses of dense >/«=/«=/Ci./0 CO / CZT3 <=>/ / jagged chert, much more than any other formation in Alabama. Chert very sparingly fossiliferous. CAMBRIANORORDOVICIAN c=3/ C3 /cC=5/C: 3/C3 CD/ C=r5/ C=i c=yCO/ <=/ C20/CTDC3 c=o /«= .-1 1 1 111. Thick-bedded bluish-gray finely crystalline dolomite, highly siliceous, with silica incrustations or network of silica ridges on Bibb dolomite. Ob ?/ <d3£?/c<??/ta^! 275-500 Ci!£?i/C3ft£>/ Ciiis> weathered surfaces of cavernous layers. .S/OSi?/fcfito ££?/«.; /'/ S ^ / / / Thick-bedded dark-gray dolomite, which is an almost pure carbonate rock of dolomite composition. To a large extent contains Ketona dolomite. 0k / / / 275-1000 not over 2 percent of insoluble matter. Extensively used in blast furnaces. / / / / / / / / cW/ <35O/<cii»/fc!!Ji <2=o/ <=^£^/ «s^ ^/'^y&/<^3if?/c& e£?/=SiP/oS5to/s$ *$j£i AyS3/<^5iO/cS Brierfield dolomite. Obf Thick-bedded bluish-gray finely crystalline dolomite, highly siliceous, with silica incrustations or network of silica ridges on ^c5yx?/c5t»/^a§ 1250± weathered surfaces of cavernous layers.
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