Oligocene
Related Words
epocheraperiodagepaleogeneneogeneeocenemiocenepaleocenecenozoicgeologystratigraphypaleontologyfossilsedimentstratumrocklimestonesandstoneshalechronologytimelineevolutionmammalcetaceanwhalegastropodmolluskflorafaunaclimatetemperatureglaciationcoolingwarmingcontinenttectonicsdriftplatemountainoceanseacoastlineecosystembiodiversityextinctionspeciationadaptationmorphologyphylogenytaxonomygenusspeciesfamilyorderclassphylumkingdomgeochronologyisotopecarbonoxygendatingradiometriclithologydepositionerosionweatheringbasinoutcropcoresamplemineralcrystalbiostratigraphyindex fossil