Thomasia is a mammaliaform from the family Haramiyidae. from the Late Triassic of Europe. It is only known from teeth.
Distribution
Fossils of the genus have been found in:
Triassic
Sables and Grès de Mortinsart Formations, Gaume, Belgium
Microlestes Quarry, Frome, England
Exter and Trossingen Formations, Germany
Auf dem Heftgen, Syren, Luxembourg
Klettgau Formation, Switzerland
Gres à Avicula contorta Formation, Franche-Comté and Lorraine, France
Jurassic
Pant Fissure System 4, Pant Quarry, St Brides Major (community), Wales