Section of the Lewis and Eldorado Thrust Faults. Green circle marks surface exposure of Lewis fault. Red and blue arrows mark surface exposures and subsurface orientation of a consistent set of rock layers on both sides of the Lewis fault.
From “The Lewis Thrust Fault and Related Structures in the Disturbed Belt, Northwestern Montana”, by Melville R. Mudge and Robert L. Earhart (1980). http://pubs.usgs.gov/pp/1174/report.pdf . Arrows and circle added.Mudge and Earhart The Lewis Thrust Fault and Related Structures in the Disturbed Belt, Northwestern Montana, USFGS Professional paper 1174.
Originally uploaded in Integrating Research and Education:Montana Geoheritage Project:Montana Geoheritage Sites:Augusta Choteau.
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