oligocene Definition

oligocene epoch, miocene, eocene, paleogene, paleocene, pliocene, ordovician, cretaceous, triassic, paleozoic, neogene, devonian, mesozoic, turonian, cenozoic, silurian, pleistocene, proterozoic, depositional, campanian, precambrian, phanerozoic, clastic, archaean, archean, sedimentary, interglacial, stratigraphy, deglaciation, geological, palaeozoic, zechstein, neocomian, dolomites, graben, palaeocene, ostracod, tertiary period, porosities, creodont, limestones, evaporite, anticlines, upper carboniferous, turaco, upper paleolithic, facies, foreland, eocene epoch, metamorphism, permeabilities, hornfels, pannonian, claystone, triassic period, candelilla, craton, schists, embayment, anticline, andesite, shales, peridotite, amphibolite, lithology, faunas, siderite, ankerite, lamprophyre, miocene epoch, breccia, hornblende, sarmatian, cretaceous period, noachian, pelite, basalts, overthrust, greisen, devonian period, orogenic, hypogene, porphyry, covellite, stibnite, pyroxenite, gabbro, brachiopods, alunite, phyllosilicate, eluvial, halite, diabase, middle paleolithic, batholith, lower carboniferous, sulphide, proximal, stratiform, mineralization,