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The AAPG/Datapages Combined Publications Database
West Texas Geological Society
Abstract
Evidence for a Cretaceous 
Age
for the Bissett Formation
Abstract
Recent fossil evidence indicates that the Bissett Formation of West Texas is of Early Cretaceous (Aptian) age, after being regarded as Late Triassic for some 60 years. The paleontologic determination of a Triassic age is found to be no longer valid. More diagnostic fossils have been discovered: vertebrae of the Early Cretaceous ornithopod dinosaur Iguanodon sp., Early Cretaceous conifers Frenelopsis sp. or Pseudofrenelopsis sp., Aptian charophytes Atopochara trivolvis Peck, Clavator harrisi Peck, and the Aptian non-marine bivalve Protelliptio douglassi (Stanton). Bissett fossils improve understanding of Cretaceous paleogeography and are important biostratigraphic references for correlation
with other non-marine units in North America and Western Europe.
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