Genevieve and St. Louis Limestones, undivided, Helderberg Formation and Keyser Limestone, Oriskany Group including Ridgeley Sandstone and Shriver Chert, SMITHVILLE DOLOMITE, POWELL DOLOMITE, COTTER DOLOMITE, JEFFERSON CITY DOLOMITE, Buttermilk Falls Limestone and Onondaga Limestones, undivided, Coeymans Formation, Kalkberg Limestone, Coeymans Limestone, Manlius Limestone, undivided, Jacksonburg Limestone and Sequence at Wantage, undivided, Minisink Limestone and New Scotland Formation, undivided, Chert, shale, argillite, siltstone, quartzite, and greenstone, Cherty limestone and sparse dolomite, shale, and sandstone, Dolomite, limestone, and minor amounts of sandstone and quartzite, Havallah sequence of Silberling and Roberts (1962), Limestone and dolomite, locally thick sequences of shale and siltstone, Limestone and minor amounts of dolomite and shale, Limestone and sparse dolomite, siltstone, and sandstone, Limestone, dolomite, shale, and quartzite, Limestone, minor amounts of dolomite, shale, and sandstone; locally thick conglomerate units, Platy limestone and limy siltstone, chert at base, Sandy and silty limestone, conglomerate, and siltstone, Shale and thin-bedded or laminated limestone; also thinly interbedded limestone and chert, Shale, chert, and minor amounts of quartzite, greenstone, and limestone, Shale, siliceous siltstone, chert, and minor amounts of limestone, Shale, siltstone, sandstone, chert-pebble conglomerate, and limestone, Siltstone, sandstone, limestone, and dolomite (commonly silty or sandy) and gypsum, Volcanic flows and flow breccias, chiefly of andesitic composition, tuffs, sparse sandstone and graywacke, Briarcliff Dolostone and Pine Plains Formation, Copake and Halcyon Lake Formations, Rochdale Limestone, Irondequoit Limestone thru Kodak Sandstone, Peebles Dolomite, Lilley and Bisher Formations, Undivided, Keokuk and Reeds Spring Formations and St. Joe Group, Mississippian Rocks above Chattanooga Shale Undifferentiated, Undifferentiated, Mississisippian, Devonian, Silurian, and Ordovician, Amphibolite of Briggs Creek (Mesozoic or Paleozoic), Colebrooke Schist (Mesozoic or Paleozoic), Condrey Mountain Schist (Triassic?
LIMESTONE AND SPARSE DOLOMITE, SILTSTONE, AND SANDSTONE-Includes units such as undivided Riepe Spring Limestone of Steele (1960) and Ely Limestone or their equivalent in Elko, White Pine, and northern Lincoln Counties and most of the Bird Spring Formation and Callville Limestone in Clark and southern Lincoln Counties. Other lesser used terms for chert (most of them archaic) Thickness ranges from 0 to 46 m (0-150 ft). In the Columbiana area of Shelby County, the Conasauga is dominated by thin to medium-bedded, dark-gray dolomitic limestone and minor dark-gray shale.

et al 1981; Pisciotto 1981; Riech 1981; Levitan 1983; Jones et al 1986; Compton Devonian Formations - Characterized by marked north-south facies variations and by very irregular distribution. Previously considered Cretaceous, but now known to contain early Tertiary microfossils in places. LIMESTONE AND MINOR AMOUNTS OF DOLOMITE AND SHALE-Includes units such as Rogers Spring and Monte Cristo Limestones. Lower contact abrupt and placed at top of calcareous quartz sandstone. Between Duttonville and Millville, grades into biohermal and nonbiohermal facies of medium- to coarse-grained limestone of Coeymans Formation of Epstein and others (1967).

Approx thickness 90 ft. Burlington Limestone- gray, fossiliferous limestone and darker gray dolomite; white and gray mottled fossiliferous chert, locally contains dolomite crystals; two widespread glauconite zones; basal sandstone locally in southeastern Iowa.

Limestone changes facies eastward into sandstone, the Elbow Ridge Sandstone Member - Medium-bedded, medium- to coarse-grained, calcarous sandstone; thickness 10 to 18 feet. The SciFest All Access virtual science festival will offer engaging STEM activities and performances extended through October 31, 2020, that celebrate the excitement of STEM for K-12 students, college students, educators, and families. Pennsylvanian beds; lowermost portion of the southern Idaho sequence (PPNs). Approx thickness 155 ft. Hampton Formation- limestone and dolomite; fossiliferous gray chert in lower portion.
age (Oles and Enlows, 1971), associated with phyllite, chlorite, and muscovite schist, and lawsonite-crossite blueschist (Swanson, 1969b), Sandstone, conglomerate, graywacke, rhythmically banded chert lenses.

Silurian(?) Gravel is composed of chert and quartz pebbles.

Thickness, about 850 feet (260 m). Permian), Attalla Chert Conglomerate Member of the Chickamauga Limestone, Chattanooga Shale and Frog Mountain Sandstone undifferentiated, Chepultepec and Copper Ridge Dolomites undifferentiated, Little Oak and Lenoir Limestones undifferentiated, Little Oak and Newala Limestones undifferentiated, Newala and Longview Limestones undifferentiated, Parkwood Formation and Floyd Shale undifferentiated, Silurian System undivided (Includes Wayne Group and Brassfield Limestone), Talladega Group; Lay Dam Formation, unnamed diamictite facies, Tuscumbia Limestone and Fort Payne Chert undifferentiated, Tuscumbia Limestone and Fort Payne Chert undivided, Pole Creek Shale (Upper Ordovician) and Bigfork Chert (Upper and Middle Ordovician), Mississippian, Devonian, and Cambrian sedimentary rocks, Carboniferous marine rocks, unit 3 (SE California Clastic Assemblage), Carboniferous marine rocks, unit 5 (Northwestern Sierra Nevada), Carboniferous marine rocks, unit 6 (Northeastern Sierra Nevada), Carboniferous marine rocks, unit 8 (Mono Lake), Franciscan Complex, unit 1 (Coast Ranges), Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains), Jurassic marine rocks, unit 4 (Peninsular Ranges and Western Transverse Ranges), Jurassic marine rocks, unit 5 (Northern Sierra Nevada and Eastern Klamath Mountains), Mesozoic volcanic rocks, unit 1 (Coast Ranges), Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains), Paleozoic marine rocks, undivided, unit 2 (Northern Mojave Desert and Southeastern Sierra Nevada), Paleozoic marine rocks, undivided, unit 3 (Eastern Sierra Nevada), Paleozoic marine rocks, undivided, unit 4 (Western Sierra Nevada), Paleozoic marine rocks, undivided, unit 6 (Northwestern Sierra Nevada), Paleozoic marine rocks, undivided, unit 9 (Western Klamath Mountains), Permian marine sedimentary rocks, unit 2 (Northwestern Sierra Nevada), Precambrian rocks, undivided, unit 2 (Mojave Desert and Transverse Ranges), pre-Cenozoic metasedimentary and metavolcanic rocks undivided, Schist of various types and ages, unit 3 (Santa Cruz Island), Schist of various types and ages, unit 8 (Condrey Mountain), Silurian and/or Ordovician marine rocks, unit 2 (Bishop), Silurian and/or Ordovician marine rocks, unit 3 (Eastern Klamath Mountains), Silurian and/or Ordovician marine rocks, unit 4 (Northern Sierra Nevada), Triassic marine rocks, unit 7 (Mono Lake), Undivided pre-Cenozoic metavolcanic rocks, unit 1 (Southwestern Sierra Nevada), Arenite, shale, dolostone, siltstone, conglomerate, chert, and limestone; Lower Ordovician marine outer continental-shelf deposits; central Idaho, Black argillite, quartzite, siltite, marble, chert, and syngenetic silver-lead-zinc deposits; Devonian euxinic marine-basin deposits; central Idaho, Chert, shale, phosphorite, and carbonates; Permian restricted marine epicontinental-basin deposits; southeastern Idaho, Coralline Limestone, sandstone, siltstone, shale, chert, and phosphorite; Mississippianshallow marine inner continental-shelf deposits; east-central Idaho, central Idaho, Dolostone, arenite, conglomerate, and chert; Silurian to Middle Ordovician marine outer continental-shelf deposits; east-central Idaho, Dolostone, limestone, arenite, and chert: Devonian to Ordovician marine outer continental-shelf deposits; east-central Idaho, Dolostone, limestone, arenite, chert, and conglomerate; Ordovician marine continental-shelf deposits; southeastern Idaho. Upper part of formation locally consists of light-bluish-gray laminated siltstone containing vugs lined or filled with quartz and scattered throughout the formation are interbeds of medium to greenish-gray shale, shaly limestone and siltstone. Mines Member of Gatesburg Formation - Gray dolomite containing siliceous "oolites" and chert having cryptozoon stromatolites. Stonehenge Limestone - gray, thin-bedded to massive, fossiliferous limestone, largely mechanically deposited, with small black chert nodules and beds of "edgewise" conglomerate. Permian fossils have been found in the topmost beds of the Tensleep at some localities in Washakie Range, Owl Creek Mountains, and southern Bighorn Mountains. The term “flint” is essentially synonymous with chert, but its usage is more restricted, at least in geology where “chert” is preferred. Fort Payne Formation - Bedded chert, calcareous and dolomitic, somewhat crinoidal; and minor shale. The highly resistant Stoufferstown Limestone member is found at the base. (Sumner Group) LAWTON- Maroon shale, about 130 feet (40 m) thick, with greenish-gray and black sandstone of the "Ryan Sandstone Bed" at base. Lower contact unconformable.