Quite a number of genera vanished at the end of the Pleistocene, precisely at the start of the Younger Dryas cold spell whose end 1300 years later marks the beginning of the Holocene epoch.
Evidence is accumulating for a multiple-bolide strike that triggered the YD and wiped out those genera, and many others in North America and even Southern Africa, along with the Clovis culture that dominated North America.
References at http://deadlyvoyager.net/References/ . The book, Deadly Voyager, is available free with on Kindle with a Prime subscription, and is a riveting read.
Evidence is accumulating for a multiple-bolide strike that triggered the YD and wiped out those genera, and many others in North America and even Southern Africa, along with the Clovis culture that dominated North America.
References at http://deadlyvoyager.net/References/ . The book, Deadly Voyager, is available free with on Kindle with a Prime subscription, and is a riveting read.