Northern Rocky Mountain Science Center

Publications

Below is a list of available NOROCK peer reviewed and published science. If you are in search of a specific publication and cannot find it below or through a search, please contact twojtowicz@usgs.gov.

Filter Total Items: 990
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Year Published: 1980

Movements of radio-instrumented grizzly bears within the Yellowstone area

Grizzly bear (Ursus arctos horribilis) movement patterns were studied with the aid of 18 radio-instrumented grizzly bears in 1975 and 1976. Five bears gave minimal information because of death, transmitter failure, or loss of transmitters. Seasonal home range information is presented for 13 bears. Two bears, trapped inside Yellowstone National...

Judd, Steven L.; Knight, Richard R.

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Year Published: 1980

The natural food habits of grizzly bears in Yellowstone National Park, 1973-74

 The natural food habits of grizzly bears (Ursus arctos horribilis Ord) in Yellowstone National Park were investigated in 1973-74 to identify the grizzly's energy sources and trophic level(s), nutrient use, and distribution. Food consumption was determined by scat analysis and field observations. Food quality and digestibility were estimated...

Mealey, Stephen Patrick

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Year Published: 1978

Climate and reproduction of grizzly bears in Yellowstone National Park

Controversy surrounds the conflicts between the requirements of human safety and the preservation of grizzly bears (Ursus arctos horribilis) in western North America. It has been difficult to separate the effect of factors such as the closure of garbage dumps from that of the climate. It has also proved difficult to relate climatic data to...

Picton, Harold D.

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Year Published: 1978

Death of a radio-marked grizzly

No abstract available.

Kolz, A.L.; Roop, Larry J.; Greer, Kenneth R.

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Year Published: 1976

Mapping of mountain soils west of Denver, Colorado, for landuse planning

No abstract available.

Schmidt, P.W.; Pierce, Kenneth L.

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Year Published: 1976

Obsidian hydration dating and correlation of Bull Lake and Pinedale Glaciations near West Yellowstone, Montana

The ages of the last two glaciations near West Yellowstone, Montana, can be calculated by obsidian hydration techniques that are calibrated by K-Ar dating of obsidian-bearing lava flows. The average age of glacial abrasion of obsidian in the Pinedale terminal moraines is about 30,000 yr, with most age measurements between 20,000 and 35,000 yr. For...

Pierce, Kenneth L.; Obradovich, J.; Friedman, Irving