Oligocene
Related Words
epochperioderapaleogeneneogeneeocenemiocenecenozoicgeologystratigraphypaleontologyfossilsedimentstratumchronostratigraphyprehistorymammalcetaceangastropodbivalveforaminiferadiatomflorafaunaevolutionextinctionclimatetemperatureglaciationcoolingwarmingtectonicsvolcanismcontinentoceantransgressionregressionlithologylimestonesandstoneshaleclaycarbonisotopeoxygengeochronologyboundarytransitionbiozonephylogenyspeciationadaptationecosystembiomegrasslandforestsavannatropicaltemperateArcticAntarcticdriftsubductionriftingbasindepositionerosionweatheringmineralogypetrologygeochemistry