Data for: Late Triassic island dwarfs: terrestrial tetrapods of the Ruthin fissure (South Wales, UK) including a new genus of procolophonid

Includes lists of all of the specimens from the NHMUK and NMW used in this research.
Includes the raw data for the abundance analysis, produced by acid digesting rock samples from Ruthin provided by the NHM, and biodiversity analysis, assembled from NHM and NMW fossil collections and data from other published material.