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Transcript of Oligocene
34 - 24 million years ago By: Samantha Moore Dominant Life Forms Apperance of the first elephants with trunks, early horses, and the apperance of many grasses http://www.ucmp.berkeley.edu/tertiary/oli.html Major Extinctions Tectonic Activity Tectonic plate movement is still changing
Africa and Europe nearly colide
India crashes into Asia; forms Himalayans
Australia separates from Antarctica
http://www.sdnhm.org/exhibits/mystery/fg_timeline.html Rock Type of Oligocene Period Most of the rock formed in the Oligocene period is sedimentary.
Some mountain building occurred
Fossils found of clams, shells, leaves, and tree branches http://www.wenval.cc/rdawes/lectures/lect8.html unidentified shell fossil from the Oligocene period Climate The temperature got much cooler in the Oligocene Period.
Antarctica was freezing up
Temperature was mild and temperate in North America http://www.infoplease.com/ce6/sci/A0836567.html http://library.thinkquest.org/20886/oligocene.html mesothermal dicotyledons (a group of flowering plants) went extinct
the "true rhinoceros" family went extinct
A major extinction event called the "Grande Coupure" occurred. www.ucmp.berkeley.edu/tertiary/oli.html Species! "hyaenodon" "mesohippus" "mesonyx" "basilosaurus" "prorastomus" "rhinocerotoids" "chalicotheriids" "anthracotheres" "didymictus" "potamotherium" "cashews trees" "lychee trees" "beech trees" "cyperaceae" "typha" "clupea" "pseudo" "serranus" "brontotherium" "bahinia" The End! :)