Thamnasteria

Fossil records

This genus is known in the fossil record from the Triassic to the Eocene (from about 247.2 to 33.9 million years ago). Fossils of species within this genus have been found in Europe, United States, Canada, China, Japan, Pakistan, Colombia, India, Thailand, Indonesia, Jordan, Lebanon, Egypt, Madagascar, Russia, Ukraine, Mexico and Peru. M. LeSauvage, the author of the genus was a physician in Caen. He wrote numerous papers on medical subjects but his other interest was palaeontology and especially the fossils of Calcaires de Caen the type locality of the genus Thamnasteria.