Geosciences and Environmental Change Science Center
September 19, 2014
The contributions of Donald Lee Johnson to understanding the Quaternary geologic and biogeographic history of the California Channel Islands
By Dan Muhs. Published in Monographs of the Western North American Naturalist.
Donald Lee Johnson (1934–2013) spent over 50 years studying diverse topics related to the California Channel Islands. During that time he made a number of memorable contributions to our understanding of the geomorphology, Quaternary stratigraphy, soil science, biogeography, archaeology, and history of the islands, including clarifying the origin of Pleistocene pygmy mammoths that inhabited them. This article, part of the 8th California Islands Symposium, gives an overview of some of those contributions.
September 17, 2014
The GECSC National Unmanned Aircraft Systems Project Office and the U.S. Fish and Wildlife Service teamed up in August to conduct a second round of Unmanned Aerial Systems surveys over Chase Lake National Wildlife Refuge, North Dakota for a census of ground-nesting colonial waterbirds. This proof-of-concept project focused on improved methodology for collecting census estimates of the American white pelican, double-crested cormorants, gulls and other breeding species found at the refuge. Detection of juvenile pelicans using improved sensors was the primary focus of this survey.
September 9, 2014
Neotectonics and geomorphic evolution of the northwestern arm of the Yellowstone Tectonic Parabola: Controls on intra-cratonic extensional regimes, southwest Montana
By Cal Ruleman (GECSC), Mort Larsen, and Michael Stickney. Published in Geological Society of America Field Guide 37—Exploring the Northern Rocky Mountains.
This one-day fieldtrip, beginning and ending in Bozeman, Montana, looks at Quaternary surface ruptures that characterize prehistoric earthquake magnitudes. It includes an overview of the active tectonics within the Madison Valley and Hebgen Lake basin, site of the catastrophic Hebgen Lake earthquake of August 18, 1959. This chapter of the Exploring the Northern Rocky Mountains Field Guide includes new geologic maps and geomorphic analyses that demonstrate preexisting structural controls on surface rupture patterns along the Madison Range and Hebgen Lake-Red Canyon fault systems.
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