devonian, pennsylvanian, shales, cretaceous, louisianan, silurian, miocene, louisianian, kentuckian, triassic, ordovician, oligocene, palaeocene, ostracod, palaeozoic, eocene, permian, turonian, caddoan, paleocene, paleozoic, arrowheads, alabaman, chickasaws, campanian, depositional, alabamian, chert, sands, virginian, zechstein, arkansan, paleogene, frontiersman, mound builders, freedman, pliocene, upper carboniferous, redneck, neocomian, slaveholder, mississipi, augustan, siltstone, sarmatian, antebellum, drilling, overthrust, wildcatter, alluvial soil, coastal plain, southerner, waterflood, south carolinian, proterozoic, landman, porosities, spud, paleo, floridian, mesozoic, dolomite, segregationist, sediments, west virginian, lithology, confederate soldier, mesolithic, choctaws, archean, wells, carboniferous, dixiecrats, roughneck, athabascan, niobrara, sedimentary rock, precambrian, sandstone, sharecropper, electrum, mudstone, stibnite, arikara, petroglyph, carboniferous period, jacksonian, footwall, nubian, graben, facies, embayment, sedimentary, stratiform, barite, cumberland plateau, harlem renaissance, wyomingite, prehistoric, bottomland, sulphides, californian, canadian, texan, anglo, yorker, georgian, australians, carolinian, congressman, egyptian, franciscan, georgians, mexicans, saxon, spaniard, american, hohokam, hopewellian, postclassic, prehispanic, puebloan, neolithic, harappan, protohistoric, algonkian, anasazi

geological period, period

lower carboniferous, lower carboniferous period, missippian period