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Estimating earthquake frequency and patterns in the Puget Lowland
Date:7/17/2014

ledge of how earthquake ruptures pass through a complex network, cascading from one fault to another.


Paleogene Grand Canyon incompatible with Tertiary paleogeography and stratigraphy
Richard A. Young and Ryan Crow, Dept. of Geological Sciences, State University of New York, 1 College Circle, Geneseo, New York 14454, USA; Dept. of Earth & Planetary Sciences, University of New Mexico, MSC03-2040, Albuquerque, New Mexico 87131, USA. Published online 25 June 2014; http://dx.doi.org/10.1130/GES00973.1. Special series: Crevolution 2: Origin and Evolution of the Colorado River System II.

The western Grand Canyon region on the Hualapai Plateau in Arizona contains an unusually long sedimentary record of the local geologic history extending back at least 50 million years. The evidence is contained in a series of abandoned canyons, associated river gravels, and lava flows that existed prior to the modern Grand Canyon. The older rivers flowed toward the northeast in the opposite direction from the modern Colorado River. The early Tertiary age of the old river sediments has been confirmed by radiometric dates acquired on a recently discovered volcanic ash layer, as well as by the presence of gastropod (snail) fossils that lived in isolated lake basins created by damming of the old rivers during folding and faulting of the bedrock. The field research that documents the geologic history of this region fills in a lengthy gap in the controversial and incomplete history leading up to the formation of the western Grand Canyon. The location and distribution of the sediments deposited prior to the erosion of the younger Grand Canyon also demonstrate that there is no space or evidence for an ancestral Grand Canyon existing more than 50 million years ago, as has recently been proposed by other geologists. The improved geologic time constraints clearly support the prevailing evi
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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