1) A deficient fossil record. There are few Oligocene sites in Africa that represent the appropriate time period, and although there are several early Miocene sites, many of their catarrhine taxa ...

When Earth was glaciated by unipolar ice sheets at Antarctica over the Oligocene and Miocene, about 34 to 6 million years ago, variations in the global climate-cryosphere and the marine carbon ...

Wilson collected specimens from the Eocene Willwood Formation in Wyoming, the Miocene Pawnee Creek Formation in Colorado, and the Eocene/Oligocene White River Group in Colorado. Koerner focused on the ...

"The biota of New Zealand is a mosaic of ancient lineages interspersed among arrays of relative newcomers that have diversified since the Oligocene-Miocene," Dr. Michael Engel from the American ...