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Geosciences 2015, 5(3), 243-263; doi:10.3390/geosciences5030243

Geologic History of Eocene Stonerose Fossil Beds, Republic, Washington, USA

Geology Department, Western Washington University, Bellingham WA 98225, USA
Academic Editor: Jesus Martinez-Frias
Received: 13 April 2015 / Revised: 19 June 2015 / Accepted: 19 June 2015 / Published: 6 July 2015
View Full-Text   |   Download PDF [27506 KB, uploaded 6 July 2015]   |  


Eocene lakebed sediments at Stonerose Interpretive Center in Republic, Washington, USA are one of the most important Cenozoic fossil sites in North America, having gained international attention because of the abundance and diversity of plant, insect, and fish fossils. This report describes the first detailed geologic investigation of this unusual lagerstätten. Strata are gradationally divided into three units: Siliceous shale that originated as diatomite, overlain by laminated mudstone, which is in turn overlain by massive beds of lithic sandstone. The sedimentary sequence records topographic and hydrologic changes that caused a deep lake to become progressively filled with volcaniclastic detritus from earlier volcanic episodes. The location of the ancient lake within an active graben suggests that displacements along the boundary faults were the most likely trigger for changes in depositional processes. View Full-Text
Keywords: paleontology; paleolimnology; sedimentology; stratigraphy; Klondike Mountain Formation paleontology; paleolimnology; sedimentology; stratigraphy; Klondike Mountain Formation

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Mustoe, G.E. Geologic History of Eocene Stonerose Fossil Beds, Republic, Washington, USA. Geosciences 2015, 5, 243-263.

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