Carnegie Museum of Natural History

For more information, contact:
Kathleen Bodenlos
Carnegie Museum of Natural History
412.622.3361 (office)

May 13, 2016


R. W. Moriarty Science Seminar: Free Lecture Series A Diverse Vertebrate Fossil Bone Bed from the Halgaito Formation of Southeastern Utah

On May 23, Amy Henrici, collection manager and scientific preparator, Vertebrate Paleontology, will review over five decades of paleontological expeditions as part of Carnegie Museum of Natural History’s free lecture series at noon in the museum’s Earth Theater.

These expeditions, one most recently by the Carnegie Museum of Natural History (1989-present), have yielded a highly diverse assemblage of at least 16 species of fishes, sharks, amphibians, and reptiles. The fossils occur in the Rico and Halgaito formations, which span the Late Pennsylvanian-Early Permian boundary and were deposited on a low relief coastal plain, which experienced occasional marine incursions and was bisected by fluvial channels.

The bone bed covers an area of roughly 84 square feet and is densely packed with partially articulated skeletons and isolated bones, which most likely accumulated as a lag deposit at the mouth of a tributary to a main stream channel during a flood event. The large concentration of fossils necessitated the excavation of the bone bed in large blocks, using the century-old technique of encasing them in a plaster and burlap jacket. Once at the museum, the blocks were opened, and the bones were exposed, stabilized, and identified.

The lecture is a part of the R.W. Moriarty Science Seminar Series, a free lecture series established in March of 2010 by Dr. Richard Moriarty, a retired pediatrician and a former Associate Clinical Professor of Pediatrics at the University of Pittsburgh School of Medicine. Currently, Moriarty is president of the Carnegie Discoverers, a volunteer group that supports Carnegie Museum of Natural History in promoting its cultural, scientific, and educational missions and in developing new audiences for the institution.


Carnegie Museum of Natural History, one of the four Carnegie Museums of Pittsburgh, is among the top six natural history museums in the country. It maintains, preserves, and interprets an extraordinary collection of 22 million objects and scientific specimens used to broaden understanding of evolution, conservation, and biodiversity. Carnegie Museum of Natural History generates new scientific knowledge, advances science literacy, and inspires visitors of all ages to become passionate about science, nature, and world cultures. More information is available by calling 412.622.3131 or by visiting the website,