An example of the Great Cut was the extinction of all European primates at the Cut: the recent discovery (Kohler and Moya-Sola 1999) of a mouse-sized omomyid from the early Oligocene. , reflecting the better chances of survival of small mammals, also helped with the example of Grand Coupure. Say no to plagiarism. Get a tailor-made essay on “Why Violent Video Games Should Not Be Banned”? Get the original essay. Whether this abrupt change was caused by the climate change that accompanied the first polar glaciations and the significant drop in sea levels, or by competition with species dispersing from Asia, few could argue in favor of a single and isolated cause. Other causes are linked to the effect of one or more large bolides in present-day Siberia and in the Chesapeake Bay. This improved the correlation of successions in northwest Europe. this confirms that the Grande Coupure occurs in the early Oligocene, with a gap of approximately 350,000 years before the first record of post-Grande Coupure Asian immigrant taxa. They noted that the only families to have crossed the faunal divide without decreasing were the marsupial family Herpetotheriidae. , the rodent families Theridiidae, Dormouse and the artiodactyl family Cantharidae. The Great Cut, which was a major European turning point in the mammalian fauna around 33.5 Mya, marks the end of the last gathering phase of the Eocene, the Priabonian, and the arrival of Asian species. the oceans were warm and full of fish and other marine life. The first Carcharhinid sharks appeared, just like land mammals, they continued to grow and many other animals formed, including Brachiosaurus, which was one of the first species of whales thought to be descended from land animals, ungulate predators called nemonychidae. The first sirenians (a large plant-eating mammal), relatives of elephants. During the Eocene, plant and marine faunas became quite modern. Reptile fossils are also known from the Eocene, such as the enormous crocodile Deinosuchus, which lived as far away as Wyoming. and became larger than the modern-day saltwater crocodile. Fossils of pythons and turtles are also known in North America. Wyoming showed that most species changed gradually over time. He also discovered that mammals in the Eocene-Oligocene Beds (30-35 Mya) of the Big Badlands of South Dakota and related areas remained the same for millions of years and that if observed, they did so abruptly. . They remained stable even during an interval of climate change. Such findings fit well with the punctuated equilibrium view, as advocated by Stephen Jay Gould and Niles Eldredge, as well as theistic views of creation. Both groups of ungulate mammals spread due to major radiations between Europe and North America; with carnivorous mammals like Mesonyx. Early forms of other mammals appeared, including bats, proboscidians (animals with proboscis), rodents, and marsupials (animals born young in an immature state and maturing in a pouch). Older primitive forms of mammals became less important and rarely seen. Significant fossil remains of terrestrial fauna have been discovered in western North America, Europe, Patagonia, Egypt, and Southeast Asia. Marine wildlife is best known in South Asia and the southeastern United States. (encyclopedia) The oldest known fossils of most modern mammals are.).