The Secrets of Earth’s History — Part 4

<p>This was the case for&nbsp;<a href="https://en.wikipedia.org/wiki/Mammal" rel="noopener ugc nofollow" target="_blank">mammals</a>, which became the dominant group on the planet. However, the most numerous group remained the&nbsp;<a href="https://en.wikipedia.org/wiki/Bird" rel="noopener ugc nofollow" target="_blank">birds</a>. In terms of plants, it was the&nbsp;<a href="https://en.wikipedia.org/wiki/Flowering_plant" rel="noopener ugc nofollow" target="_blank">flowering plants</a>&nbsp;that colonized the Earth&rsquo;s surface.</p> <p><strong>Some&nbsp;</strong><a href="https://en.wikipedia.org/wiki/Dinosaur" rel="noopener ugc nofollow" target="_blank"><strong>dinosaurs</strong></a><strong>&nbsp;managed to survive the crisis</strong>, and&nbsp;<a href="https://en.wikipedia.org/wiki/Bird" rel="noopener ugc nofollow" target="_blank">birds</a>&nbsp;as well as present-day&nbsp;<a href="https://en.wikipedia.org/wiki/Crocodile" rel="noopener ugc nofollow" target="_blank">crocodiles</a>&nbsp;are their descendants.</p> <p>After the crisis episode, the climate continued to warm until reaching an optimum in the early&nbsp;<a href="https://en.wikipedia.org/wiki/Paleogene" rel="noopener ugc nofollow" target="_blank">Paleogene</a>. In the meantime,&nbsp;<strong>the Paleocene-Eocene Thermal Maximum (</strong><a href="https://en.wikipedia.org/wiki/Paleocene%E2%80%93Eocene_Thermal_Maximum" rel="noopener ugc nofollow" target="_blank"><strong>PETM</strong></a><strong>)</strong>, an abrupt event that started 55 million years ago and lasted 100,000 years, occurred. The temperatures of the deep and surface oceans rose abruptly. For instance,&nbsp;<a href="https://en.wikipedia.org/wiki/Southern_Ocean" rel="noopener ugc nofollow" target="_blank"><strong>Antarctic</strong></a><strong>&nbsp;waters reached 21&deg;C, with palm trees growing there</strong>.</p> <p><a href="https://medium.com/@Hydrau/the-secrets-of-earths-history-part-4-c075dfdaa561"><strong>Website</strong></a></p>
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