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News Release

11 December 2007
GSA Release No. 07-70

Contact: Christa Stratton
+1-303-357-1093
FOR
IMMEDIATE
RELEASE

Dakotas Continue to Yield Paleontological Treasures

Boulder, CO, USA – Two hundred years ago Lewis and Clark's Corps of Discovery laid the groundwork for a good deal of scientific research with its descriptions of territory acquired through the Louisiana Purchase. While Thomas Jefferson was said to be disappointed by the absence of living megafauna, the area ultimately yielded a wealth of Late Cretaceous fossils. A new volume published by the Geological Society of America makes clear that the process of discovery continues.

The Geology and Paleontology of the Late Cretaceous Marine Deposits of the Dakotas, GSA Special Paper 427, offers a new state-of-the-science overview of a stretch of land along the Missouri River. Included are the Greenhorn, Pierre, and Fox Hills Formations.

"Intense study of this area over the past twenty years led to assembly of this volume," said lead editor James Martin of the Museum of Geology and Department of Geology and Geological Engineering, South Dakota School of Mines and Technology. "The time was right to consolidate some significant breakthroughs and make them readily accessible."

Breakthroughs documented in the volume include:

*Elevation of the Pierre Shale to group status
*Naming of new Pierre Shale members
*Correlations based on geochemistry of bentonites and rare earth elements
*Identification of the stratigraphic source of the first reptile collected from the American West based on rare earth element analysis

Also examined are invertebrate fossils including some associated with a shell-crushing marine reptile, the first clear recognition of a North American mosasaur (Hainosaurus), a new species of short-necked plesiosaur, and a new species of diving bird.

Individual copies may be purchased through the Geological Society of America online store
or by contacting GSA Sales and Service,

Book editors of earth science journals/publications may request a review copy by contacting Jeanette Hammann,

The Geology and Paleontology of the Late Cretaceous Marine Deposits of the Dakotas
James E. Martin and David C. Parris (eds.)
Geological Society of America Special Paper 427
2007, 246 pages, US$60.00, GSA member price US$42.00
ISBN 978-0-8137-2427-0


www.geosociety.org
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