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GEOLOGICAL SURVEY OF ALABAMA QUADRANGLE SERIES MAP 32 PLATE 2 EXPLANATION FOR GEOLOGIC MAP AND CROSS SECTION SYMBOLS FOR GEOLOGIC MAP Contact, located very approximately, showing location of control point Alluvium. Unconsolidated silt, sand, and gravel containing clasts of Frog Mountain Sandstone. Light-gray, poorly sorted, predominantly quartzose Qal Dfm local bedrock. Mapped only along larger streams. sandstone. Thrust fault, located very approximately, sawteeth on upper plate DEVONIAN Little Oak Limestone and Lenoir Limestone undifferentiated. Dark-gray partly QUATERNARY Pottsville Formation upper part. Dark-gray silty shale containing Olol fossiliferous stylonodular limestone locally containing chert nodules (Little Oak Contact or fault, concealed beneath mapped units P pvu intervals of light- to medium-gray primarily lithic sandstone and interbeds of coal and underclay. and Lenoir); medium- to dark-gray fenestral limestone at base (Mosheim Member of Lenoir). 45 Strike and dip of beds Pine Sandstone Member. Very light-gray quartzose sandstone commonly Odenville Limestone. Dark-gray mottled dolomitic limestone overlain by dark- Oo Ppvp containing scattered quartz pebbles and quartz pebble conglomerate; wavy- gray fossiliferous stylonodular limestone. Horizontal beds bedded sandstone and mudstone common in upper part. Newala Limestone. Medium-bluish-gray chert-free micritic limestone containing Vertical beds Hardwick Tunnel member. Predominantly dark-gray to black shale with On P pvht interbeds of light- to light-bluish-gray dolomite and medium- to dark-gray mottled occasional interbeds of thin sandstone and rare bioclastic limestone. dolomitic limestone. Overturned beds ORDOVICIAN 75 Pottsville Formation undifferentiated. Dark-gray primarily silty shale between the Shades Longview Limestone. Interbedded light- to medium-gray micritic and partly Ppv Olv and Pine Sandstone Members. sandy limestone and light-gray dolomite; commonly contains thin interbeds and Anticline, showing trace and direction of plunge PENNSYLVANIAN nodules of chert. KNOX GROUP KNOX Pottsville Formation lower part. Quartzose to quartzitic, pebbly sandstone, P POTTSVILLE FORMATION POTTSVILLE pvl strongly fractured and deformed. _ Chepultepec Dolomite and Copper Ridge Dolomite undifferentiated. Light- Syncline, showing trace and direction of plunge OCchcr to dark-gray dolomite containing intervals of interbedded light- to medium-bluish- gray limestone; produces abundant dense and cavernous chert (Chepultepec); Shades Sandstone Member. Very light-gray quartzose sandstone commonly light- to medium-gray dolomite producing abundant predominantly dense chert Ppvs containing scattered quartz pebbles and quartz pebble conglomerate; includes containing common algal laminations (Copper Ridge). thin intervals of dark-gray shale. Parkwood Formation and Floyd Shale undifferentiated. Dark-gray shale Ck Ketona Dolomite. Light- to dark-gray chert-free dolomite. P Mpwf containing interbedded greenish-gray lithic and quartzose sandstone (Parkwood Formation). Dark-gray to black shale locally containing minor laminae and thin beds Rome Formation. Grayish-red-purple and grayish-olive mudstone, shale, and Cr LOWER TO LOWER AND of light-gray sandstone (Floyd Shale); lower part includes grayish-orange fossiliferous siltstone containing interbedded sandstone, dolomite, and limestone. Not exposed chert (tongue of Bangor Limestone). on map. SYMBOLS FOR CROSS SECTION A-A' UPPER CAMBRIAN MISSISSIPPIAN PENNSYLVANIAN Hartselle Sandstone. Very light-gray crossbedded and rippled quartzose Stratigraphic contact Mh sandstone locally containing thin interbeds and partings of dark-gray shale. Fault, showing relative movement Pride Mountain Formation. Dark-gray shale commonly containing nodules, Mpm stringers, and beds of siderite. Tuscumbia Limestone, Fort Payne Chert, and Maury Formation Mtfpm undifferentiated. Light- to medium-gray coarse bioclastic limestone containing abundant echinoderm columnals (Tuscumbia); chert, light-gray to brown weathering orange-brown, thin- to medium-bedded, nodular, contains brachiopods and echinoderm columnals (Fort Payne); mudstone, maroon, medium- to thick-laminated (Maury). MISSISSIPPIAN Fort Payne Chert and Maury Formation undifferentiated. Thin-bedded, Mfpm medium-dark-gray limestone and dark-bluish-gray chert weathering to grayish- orange chert (Fort Payne). Pale-olive and grayish-red-purple mudstone locally containing discoid phosphatic concretions (Maury). CROSS SECTION A-A' A Cahaba synclinorium Coosa synclinorium Coosa deformed belt A' Jones Valley thrust sheet Helena thrust sheet Helena fault Coal City syncline Yellowleaf anticline Eden fault Yellowleaf fault ? Acmar Cahaba Valley Brompton Taylors Mountain Wolf Pen Ridge Wolf Creek U.S. Highway 411 Interstate 20 Kelly Creek (Feet) 1,000 1,000 (Feet) Ppvl 500 Olol 500 P Mpwf form line Dfm Mfpm (Sea Level) 0 0 (Sea Level) On Dfm Dfm On -500 P Mpwf -500 On Mtfpm -1,000 Ppvu -1,000 Oo Mpm -1,500 OCchcr_ -1,500 Mh -2,000 Olv -2,000 Ck P pvht -2,500 -2,500 Ppvu Cr P Mpwf -3,000 -3,000 structurally Ppv -3,500 Ppvp thickened -3,500 Ppvp -4,000 Ppvs -4,000 -4,500 -4,500 Ppvs P Mpwf -5,000 structurally -5,000 P Mpwf thickened -5,500 -5,500 Mh -6,000 -6,000 Scale 1:24,000 No vertical exaggeration CROSS SECTION A-A' AND EXPLANATION FOR THE GEOLOGIC MAP OF THE COOKS SPRINGS 7.5-MINUTE QUADRANGLE AND CROSS SECTION, ST. CLAIR AND SHELBY COUNTIES, ALABAMA By Willard E. Ward Computer graphics by Don Wheat 2004 Berry H. (Nick) Tew, Jr. State Geologist.