Millions of years ago, a volcano erupted in what's now the Patagonia region of southern Argentina, leaving behind a huge caldera. Water accumulated in the crater, and eventually it became a lake teeming with countless plants, insects, and other life-forms. Over time, these creatures fossilized deep within the lake's layers of mud and ash, creating a kind of geological jackpot for today's paleontologists.
Five fossils of different individuals were found on 1961 by barite miners in Morocco. Now, on a study of a team, the fossils were suspected to be the earliest kind of Homo sapiens than what was already known in the history of evolution.
Archicebus Achilles is the known earliest primates before skeletons and fossils of the Torrejonia was discovered. Both are known tree-dwellers a few years after the dinosaur times.