We have arrived in the Devonian period, some 420 to 360 million years ... Because all later land vertebrates, or tetrapods, can be traced back to a fish. This encompasses not only amphibians ...

At that time, known as the Devonian ... earliest tetrapods -- four-legged animals that walked on land -- has long been of intense interest to biologists. Many of the most telling fossils have ...

Learn about the time period that took place 416 ... such as the famous "living fossil" fish, the coelacanth. A fossil creature from the Devonian discovered more recently has been hailed as a ...

Depositional setting, taphonomy and geochronology of new fossil sites in the Catskill Formation (Upper Devonian) of north-central Pennsylvania, USA, including a new early tetrapod fossil.

“Buena vista” hypothesis suggests that changes in the sizes of eyes, rather than a shift from fins to limbs, led fish to transition to land more than 300 million years ago. During the Devonian period, ...

which goes back to the mid-Devonian period about 400 million years ago. By examining the rocks surrounding these fossils, scientists determined that the environment back then was probably a ...

Late Devonian brachiopod fossils were preserved as molds in a fine-grained sandstone (Big Creek, Hornell, New York, N 42.364361, W 77.645760). Individual fossil samples like this are the basis for ...

Hyneria udlezinye is shown together with the tetrapods Umzantsia amazana and Tutusius umlambo, the placoderms Groenlandaspis riniensis and Bothriolepis africana, the coelacanth Serenichthys ...

Proceedings of the Academy of Natural Sciences of Philadelphia, Vol. 23, No. 1 (Jan. - Mar., 1871), pp. 57-88 (32 pages) ...