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Illustration.Pdf exio GENERALIZED SECTION OF THE ROCKS IN THE HOLLIDAYSBURG AND HUNTINGDON QUADRANGLES SCALE: 1 INCH = 1000 FEET SYSTEM SERIES GROUP THICKNESS FORMATION. SYMBOL SECTION IN FEET MINOR DIVISIONS CHARACTER OF MEMBERS GENERAL CHARACTER OF FORMATIONS PENNSYL- Brookville coal member. Probably 41 to 5 feet thick. Impure; inferior quality. Shale and sandstone with workable coal beds. VANIAN Allegheny formation. Ca ^-^^50 Homewood sandstone member Coarse thick -bedded sandstone. Mercer shale member Clay, coal, and shale 130 300 Mainly coarse sandstone with shale, coal, and clay in middle. Pottsville formation Cpv ^JcrorgTqoijuuuuiMranacxx Connoquenessing sandstone member. Coarse thick-bedded sandstone. _ -~ '~^^~^~=^ In Hollidaysburg quadrangle coarse, lumpy, red and green shale, mostly red; 80 feet of sandstone at bottom. CARBONIFEROUS Mauch Chunk formation. Cmc 180-1000 In Huntingdon quadrangle a little yellowish-green sandstone in midst of red shale and at top; at bottom, V-'i' -V-' r'-'i'.v: 'i ' '!' ' Trough Creek limestone member, red and gray, coarsely crystalline. ~~~~^-- _ ^&>;&^:^&;& Siliceous cross-bedded limestone. (Cb) (300-500) Burgoon sandstone member Rather coarse micaceous, arkosic yellowish or greenish-gray thick-bedded MISSISSIPPI sandstone. Patton shale member. _- - - -- - Red shale on Allegheny Front and westward. Pocono formation. Cpo 990 Lower 700 feet in Hollidaysburg quadrangle, shale and sandstone, considerable red shale. Lower 900 feet in Huntingdon quadrangle, shale, sandstone, and conglomerate, very little red shale. Shale mostly stiff, imperfectly fissile, greenish. ^-j-i-^-'. ' "*" '.. '' _» =y^=-^-- "ZZT??*?1^^ - .-T^ ' ' - ' ' ' ^ About 80 percent bright red shale, alternating with layers of reddish or brown sandstone, which is generally 8000- thick-bedded and medium-grained. Some laminated layers. The red .shale is in places mottled with Hampshire formation. Dck bright green, and there are many thin layers of bright, green in the red shale. Beds of gray shale and 2500 sandstone occur throughout the formation; in these is a sparse marine fauna; No fossils have been found in the red parts. Z mm O ^-L.^-L-1,--^^--^^. z LU ^sr^';-'.^ :..>J Q ^^ ".. J.^f^v^^.f^ Shale and sandstone. Upper 1,000 feet largely chocolate-colored clay shale and fine-grained, thin-bedded 2400- chocolate-colored sandstone. Lower part gray and green shale, mostly gray clay shale, with sandstone. Chemung formation. Dch Sandstones from 1-inch layers of argillaceous sandstone to 50-foot beds of siliceous, medium-grained, mod­ 8S50 erately thick-bedded sandstone. Two thin local beds and two persistent beds of conglomerate and sand­ = r stone in the Huntingdon quadrangle; one conglomeratic sandstone bed in the middle in the Hollidaysburg quadrangle. Fossils moderately plentiful throughout. z CC -7- -.-."r-. .T.-TTTT-; o UJ Q. Q_ *^-.. :-....:...".. UJ 13 Q Very fine-grained, sandy and micaceous stiff greenish-gray shale. Much of it thinly laminated, even- j_-._=^-. - - 1350- surfaced, with lamination cleavage dividing rock into large slaty plates, with weathered surfaces stained 0 Brallier shale. Db 1800 black with manganese oxide. Thin fine-grained greenish sandstone layers near top. Small fossils r throughout but very scarce. Characteristic Portage (Naples) fauna. o Q. Interbedded black and gray soft, very fissile (paper) clay shale in Huntingdon quadrangle. Soft brownish- Harrell shale. Dhr 250 gray shale above. Burket black shale member below in Hollidaysburg quadrangle. Small fossils (Dbk) (80) Burket black shale member. Black fissile shale in Hollidaysburg quadrangle. Small fossils. throughout (Naples fauna). gs^M^^s^rss? z Nearly all shale in Hollidaysburg quadrangle. Layers of very fine-grained sandstone up to 1 foot thick UJ«t in middle part, characteristically jointed into straight-edged, smooth cuboidal or rhomboidal blocks; Hamilton formation. Dh 750-1200 Two persistent sandstone strata, 50 to 75 feet thick, at top and bottom of partly olive-green shale in upper part; finely laminated, dark shale below. A few feet of gray shale with o z middle third in Huntingdon quadrangle. thin layers of limestone at top crowded with fossils; olive shale, moderately fossiliferous; lower two- Q O thirds almost barren of fossils in Hollidaysburg quadrangle. EUJ O Marcellus shale. Black fissile shale. Sparsely fossiliferous (Iseiorhynchus limitaris) . Onondaga formation. Dark and drab shale, thin limestone at top. Fossiliferous Ridgeley sandstone. Dr 100 Shriver limestone. Ds 200 Thin-bedded siliceous limestone; black calcareous, fossiliferous shale in bottom. 10 feet (Oriskany fauna). o New Scotland limestone member. Cherty limestone. Thick- and thin-bedded, coarsely crystalline, fine-grained, bluish-gray limestone. Characteristic nodular, Helderberg limestone. Dhb 150± Coeymans limestone member. argillaceous layers everywhere in Keyser limestone member. Locally cherty layers near bottom of 'i 'i 11/ 1 11 i1 'i1 'i Keyser limestone member. Keyser (Calico rock). Main quarry bed at bottom. Tonoloway limestone. Stw 450 'ihick-bedded, dark to black limestone at top, mostly thin-bedded and laminated, dark, fine-grained. A few fossils, mainly l^eperditia. =«=EZ^ = 3=nr-r3_= r r i i nrr: -r-i j- Swc Mostly drab fissile clay shale. Some green and dark shale. Probably calcareous. Thin limestone, espe­ Wills Creek shale. ^rn=L. _. ",' ' 400± cially near bottom. Fossils very scarce, mostly small Leperditia, a few brachiopods. Z 1 1 1 1 l_l_- 1 1 l l-Vil. :^IJo±"~~" O Bloomsburg redbeds. "SB - Red shale and sandstone east of Tussey Mountain. Red shale and gray limestone in Hollidaysburg quadrangle. McKenzie formation. Smk 400 Thin-bedded blue limestone. Highly fossiliferous; small ostracodes, mostly Kloedinella, very plentiful. CC ID ; . 4' . ', .' . '. ; . '. .'. ; . -.-, 10) Keef er sandstone member. Siliceous rusty limestone west in Hollidaysburg region. Marklesburg ore. Oolitic and "fossil ore" east of Tussey Mountain. 3 to 2 feet thick. _J <a Predominantly shale; chocolate at top, greenish and gray in middle, with red layers in lower part; pink, fissile shale at very bottom. Thin limestone at top; rather thick limestone at bottom, interbedded with S) Clinton formation. Sc 775± red shale. Thin impure, limy ore beds near top, and a workable bed in places near middle. Generally CO CO --- ~ - --- fossiliferous, especially so in upper part. Z Frankstown ore. Oolitic and fossil ore in Hollidaysburg region. 1 to 2 feet thick. Block or Levant ore and "Iron sandstone." Hard red sandstone, locally an ore bed in lower part. Gray quartr.itic sandstone and quartzite. Supplies the ganister of the region, which is extensively used Tuscarora quartzite. St 400-600 for refractory brick and furnace linings. Juniata formation. Oj 850 Predominantly red shale and sandstone; sandstone medium-grained and much of it finely cross-laminated. 0 O Q Oswego sandstone. Oo ±; ^TTV -.' v -rfrVv'.l '.' : ': 800 Almost all gray, brown-speckled medium-grained thick-bedded sandstone; a few layers of red, gray, or £^:^^i-M&£ green sandy shale. z cc o t'^^rf^rirv.^^We^ CC LU J_J'I 11- . ... Tra-JL CL Olive-green clay shale in lower part, except about 20 feet at bottom, which is generally black. Upper part ?-' -1-!^- ^= dark clay shale with many thin shell-limestone bands. Top 30 feet heavy calcareous sandstone with Q- Reedsville shale. 1000 fossils in upper part. Fossils plentiful in the limestone bands in the upper part and in the black shale at o ID the bottom; scarce in the olive-green shale of the lower part. Black shale (Utica?).______________ Black fossiliferous shale with thin black limestone layers. Graptolites. z Trenton limestone. Ot 350 Thin-bedded dark-gray to black fine-grained or nongranular limestone. Sparingly fossiliferous 11 Rodman limestone. Gray granular limestone. Fossiliferous. E Q Thick-bedded dark fine-grained to nongranular pure limestone. Moderately fossiliferous. Best quarry cc moc Lowville limestone. Ol 180 O rock o UNCONFORMITY III III Lemont argillaceous limestone member. Carlim limestone. Oc 180 Highly argillaceous siliceous limestone. Abundantly fossiliferous. Not Thick-bedded dark limestone, mostly finely crystalline. Moderately fossiliferous. Quarry rock. _ - quarried for flux. Z UNCONFORMITY _^_L_ .~ 1 !«= ' ! fj _!- Q 1 1 <=> 1 <= 1 CC 0 c E^^Ti^d^^ifj^isre Thick-bedded crystalline dolomite, mostly gray; more or less chert throughout, but especially in middle Bellefonte dolomite. Ob z> 1 c^> 1 ' * 1 tZ^>\ g'. '> j <r^; 1000 and lower parts. A few fossils in the chert. 5: 0 1 Qol o lo IQIC ol o 1 T .<=> 1 1 O o 1 1 -o 1 1 1 O ol teal loll D c ___ 1 |0|| | CC CO Axemann limestone. O £ cc 2 1^^^ id^dto^4!^^ LU <D *^ ! ^Si2n> \? *!&*?&& Ift*5^**! ^ Thick-bedded gray crystalline dolomite. Much dense chert in middle part and some chert throughout. Nittany dolomite. On >j <___$ | <j^> \(&Q& 1 @>|< 1000 S> 1 «S» j^D -«£><!lSjeJ«» tfZ3| a_j Fossils in chert; Lecanospira zone. CO ^2 I ©2£> 1 <ftSSp p@5S_> O 3| <^S 1 CST> 1 ^""""^ 1 o u-'ti^S'^'i<=» J <^* I " yj^-* 1 <is1* COLUMNAR SEGTrON-Contintied SCALE: 1 INCH = 1000 FEET s FORMATION SYMBOL SECTION THICKNESS MINOR DIVISIONS CHARACTER OF MEMBERS IN FEET. GENERAL CHARACTER OF FORMATIOMH QQ OQ 1 -_-_! ___! . 'oT- Larke dolomite. 860 Thick-bedded dolomite, without sandstone, and in most of its area without notable development of chert. d LOWER ORDOVICIAN 1 Ola / «=> l i ° i Locally, yields abundant heavy chert, which is sparingly fossiliferous. ce J Thick-bedded dolomite like that of the Gatesburg. No sandstone. Abundant development of platy O Mines dolomite. Om 860 scoriaceous oolitic chert with Cryptozoa, but without other fossils. Basal layer of dolomite loyally full 1 of gastropods (Sinuopea). TT-'.'.VJ , ;/' .:: i ii 1,1 ,i , ^ , Z ; i / _..(_ i ' '/ 'l.'- Thin-bedded limestone, bluish, fine- or medium-grained. Some thin layers il .L1 ,' ! '.'. .'.' .' !' (100) Ore Hill limestone member. with fossils, including several genera and species of trilobites, mostly undescribed, a few gastropods and brachiopods. Thick-bedded bluish coarsely crystalline dolomite and fine-grained dolomite with argillaceous bandings Gatesburg formation. i i i i i _1_ 1760 giving striped appearance to weathered surfaces.
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