Bartonian life

Notharctus is a genus of adapiform primate that lived in North America and Europe during the early to middle Eocene. left|thumb|N. tenebrosus (left) compared to Plesiadapis|Plesiadapis cookei (right), a plesiadapiform. Both come from [[Eocene Wyoming, though the latter is slightly geologically older (Museum of Natural Sciences, Brussels).]] The body form of Notharctus is similar to that of modern rats. Its fingers were elongated for clamping onto branches, including the development of a thumb. Its spine is flexible and the animal was about in length, excluding the long tail.

Ginglymostoma (from the Ancient Greek words γίγγλυμος (gínglumos), meaning "hinge", and στόμα (stóma), meaning "mouth") is a genus of shark in the family Ginglymostomatidae. There are two members in the genus. Members of this genus eat small fish and crustaceans, and are commonly quite lethargic unless provoked. Members of this genus have the ability to suck in water in order to remove snails from their shells in a manner that can be described as 'vacuum-like'.

Niolamia is an extinct genus of South American meiolaniid turtle with a long and complex history. Like its relatives, Niolamia was a robust and heavily armored terrestrial turtle with large, horn like scales covering its head and a tail encased by rings of bone. This heavily armored build may have served the animal during intraspecific combat during courtship, though such encounters likely did not involve the horns and frill, which are thought to serve more of a display function. Scans of the skull reveal that Niolamia likely had a great sense of smell but only low frequency hearing, indicatin

Campanorco is an extinct genus of notoungulate mammal from the Middle Eocene Lumbrera Formation, Argentina, South America and the only member of the family Campanorcidae. It contains only a single species, Campanorco inauguralis.

Leptadapis is an extinct genus of adapiform primate that lived in Europe during the middle Eocene. Fossils of the genus have been found in the Escanilla Formation of Spain, at the sites of La Bouffie and Perrière in France, and at Egerkingen in Switzerland.