The oldest record of drepanosaurids (Reptilia, Diapsida) from the Late Triassic (Adamanian Placerias Quarry, Arizona, USA) and the stratigraphic range of the Drepanosauridae

Authors: Renesto, Silvio C.; Spielmann, Justin A.; Lucas, Spencer G.

Source: Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen, Volume 252, Number 3, June 2009 , pp. 315-325(11)

Publisher: E. Schweizerbart'sche Verlagsbuchhandlung

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Abstract:

Previous detailed descriptions of relatively complete drepanosaurid material make it possible to recognize isolated drepanosaurid elements from other localities. The identification of isolated elements from the USA and Great Britain extended the geographical distribution of the group and encouraged a review of Triassic collections for characteristic elements of this family. In this paper, isolated vertebrae previously described as problematic reptiles from the famous Placerias Quarry, near St. Johns, Arizona, USA are re-identified as drepanosaurids. These specimens represent the oldest occurrence of this family, which is earliest Adamanian.

Keywords: DREPANOSAURIDAE (REPTILIA DIAPSIDA); CHINLE GROUP; ISOLATED VERTEBRAE; BIOSTRATIGRAPHY

Document Type: Research article

DOI: 10.1127/0077-7749/2009/0252-0315

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