Earth History GEOL 2110. The Cenozoic Era The Modern World Emerges Climate and Life. Major Concepts.
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The Cenozoic Era
The Modern World Emerges
Climate and Life
Methane Degassing Event
USGS map of known and suspected methane hydrate deposits
Seismic profile off
Deep-sea plume of methane escaping from the sea floor
The Great Eocene-Oligocene Cool Down
Cool DownSeparation of Australia and SA from Antarctica triggers Glaciation and Major Extinction of Warm-climate Species
Mid-Miocene Cool Down
Arctic – Atlantic Connection Established
Warm, lush forests/jungles of the Eocene give way to ….
Temperate grasslands and savannas of the Miocene
“In the Late Cretaceous, no mammal was larger than a house cat. By the Eocene (40Ma) all modern orders of mammals had evolved with some the size of a rhinoceros or elephant”
Longer –limbed runners Better eye sight
Cud-eaters Hoofs replace toes
High crowned teeth that continue to grow
Isthmus established in Mid-Pliocene (4Ma)