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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 5,500 book chapters authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
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Metamorphosed precambrian silicic volcanic rocks in central Arizona Metamorphosed precambrian silicic volcanic rocks in central Arizona
Silicic volcanic rocks — dacite, rhyolite, and quartz porphyry — constitute about 35 percent of the Yavapai Supergroup, an older Precambrian sequence in central Arizona. In addition, the series contains about 30 percent pillow and amygdaloidal basalt, 5 percent andesitic rocks, and the remainder is mixed andesitic and silicic-bedded tuffaceous rock. The Yavapai Supergroup is divided into...
Authors
C.A. Anderson
Geology, paleomagnetism, and potassium-argon ages of basalts from Nunivak Island, Alaska Geology, paleomagnetism, and potassium-argon ages of basalts from Nunivak Island, Alaska
Geologic mapping, paleomagnetic stratigraphy, and potassium-argon dating were used to determine the time and volume relations of tholeiitic and alkalic basalt on Nunivak Island in the Bering Sea near the coast of Alaska. Volcanism on Nunivak Island occurred in distinct episodes separated by quiet intervals that lasted from 1.6 to 0.6 m.y. During the past 6 m.y., tholeiitic basalt was...
Authors
J. M. Hoare, William H. Condon, Allan Cox, G. Dalrymple
Flow Structure and Composition of the Southern Coulee, Mono Craters, California—A Pumiceous Rhyolite Flow Flow Structure and Composition of the Southern Coulee, Mono Craters, California—A Pumiceous Rhyolite Flow
The Southern Coulee is the southernmost and largest of the four Recent pumiceous rhyolitic coulees, or stubby flows, of the Mono Craters, eastern California. It is one of the youngest volcanic deposits of the Mono Craters and is largely bare and uneroded. The coulee is 3.6 km long and averages 1.2 km in width and 75 m in thickness. It was protruded from a north-trending fissure beneath...
Authors
R. Loney
Chapter 9: Theory and processes relating to the lunar maria from the surveyor experiments Chapter 9: Theory and processes relating to the lunar maria from the surveyor experiments
Prior to the Surveyor missions, there were three principal theories about the chemical constitution of the lunar maria: that the maria were (1) chondritic, (2) basaltic, or (3) silicic. Three types of materials recovered on Earth were suspected of coming from the maria: (1) chondritic meteorites, (2) basaltic achondrites, and (3) tektites. The Surveyor chemists have now spoken: Turkevich...
Authors
J. O’Keefe, J. Adams, D. Gault, J. Green, G. Kuiper, Harold Masursky, Robert Phinney, Eugene Shoemaker
A case study in Canada goose management: The Mississippi Valley population A case study in Canada goose management: The Mississippi Valley population
No abstract available.
Authors
H.M. Reeves, A.S. Hawkins, H. Dill
Bird life of the upper Potomac valley Bird life of the upper Potomac valley
No abstract available.
Authors
C.S. Robbins
Control of predators and competitors Control of predators and competitors
No abstract available.
Authors
Frank B. McGilvrey