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Browse more than 160,000 publications authored by our scientists over the past 100+ year history of the USGS.  Publications available are: USGS-authored journal articles, series reports, book chapters, other government publications, and more.

Filter Total Items: 6052

Paleomagnetism, potassium-argon ages, and geology of rhyolites and associated rocks of the Valles Caldera, New Mexico

Paleomagnetic and potassium-argon studies support geologic evidence that the lower member of the Bandelier Tuff was deposited 1.4 m.y. ago. The upper member erupted about 1.0 m.y. ago and was followed by caldera collapse which formed the 12- to 14-mile diameter Valles Caldera. Postcaldera activity which resulted in the eruption of rhyolite domes and pyroclastic material, has occurred at about 0.9,
Richard R. Doell, G. Brent Dalrymple, Robert L. Smith, Roy A. Bailey

Chapter 3: Television observations from Surveyor VII

Surveyor VII, the last spacecraft of the Surveyor series, successfully landed at 01:05:36 GMT, January 10, 1968, on the outer rim flank of the large crater Tycho, in the southern part of the Moon. The spacecraft landed about 30 hours after local lunar sunrise and transmitted about 21,000 pictures during the remainder of the first lunar day of operation. On January 22, after local sunset, almost 70
Eugene Merle Shoemaker, R. M. Batson, H. E. Holt, E. C. Morris, J. J. Rennilson, E. A. Whitaker

Chapter IX: Lunar theory and processes

Whereas the previous Surveyor missions were undertaken to examine mare surfaces as potential landing areas for the Apollo Program, the primary objective of the Surveyor VII mission, based on purely scientific motivations, was to explore a contrasting highland region and, specifically, to determine the chemistry of the highland material for comparison with the Surveyor V and VI chemical analyses at
D. E. Gault, J. B. Adams, R. J. Collins, G. P. Kuiper, H. Masursky, J. A. O'Keefe, R. A. Phinney, Eugene Merle Shoemaker

Chapter 3: Television observations from Surveyor VI

Surveyor VI landed on the lunar surface at 01:01:05 GMT on day 314 (November 10, 1967) in the southwestern part of Sinus Medii near the center of the visible face of the Moon. Over 30,000 pictures were transmitted from the spacecraft during the first lunar day of operation. The number of pictures taken by Surveyor VI almost equals the total number of pictures returned from the previous Surveyor mi
E. C. Morris, R. M. Batson, H. E. Holt, J. J. Rennilson, Eugene Merle Shoemaker, E. A. Whitaker

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 the Ash C
C.A. Anderson

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 erupted durin
J. M. Hoare, William H. Condon, Allan Cox, G. Brent Dalrymple

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 the crest o
R. A. Loney

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, Franzgro
J. A. O'Keefe, J. B. Adams, D. E. Gault, J. Green, G. P. Kuiper, Harold Masursky, Robert A. Phinney, Eugene Merle Shoemaker

A case study in Canada goose management: The Mississippi Valley population

No abstract available.
H.M. Reeves, A.S. Hawkins, H. Dill

Bairds's junco

No abstract available.
R.C. Banks

Bird life of the upper Potomac valley

No abstract available.
C.S. Robbins

Common faults of management

No abstract available.
J.L. Sincock