Publications
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Preliminary geologic investigation of the Apollo 12 landing site: Part A: Geology of the Apollo 12 Landing Site
This report provides a preliminary description of the geologic setting of the lunar samples returned fromt he Apollo 12 mission. A more complete interpretation of the geology of the site will be prepared after thorough analysis of the data.
Authors
E.M. Shoemaker, R. M. Batson, A.L. Bean, C. Conrad, D.H. Dahlem, E. N. Goddard, M. H. Hait, K.B. Larson, G. G. Schaber, D. L. Schleicher, R. L. Sutton, G.A. Swann, A. C. Waters
Bibliography of the lunar surface
The term "surface" in this bibliography is defined to include landforms and surface materials and the nature of, and processes responsible for, their physical characteristics. References are divided into two listings: (1) Surface features and materials; and (2) Telescopic observations. The former is accompanied by a subject index, the latter by a locality index.
Authors
Jacquelyn H. Freeberg
A computer program to trace seismic ray distribution in complex two-dimensional geological models
A computer program has been developed to trace seismic rays and their amplitudes and energies through complex two-dimensional geological models, for which boundaries between elastic units are defined by a series of digitized X-, Y-coordinate values. Input data for the program includes problem identification, control parameters, model coordinates and elastic parameter for the elastic units. The pro
Authors
Nazieh K. Yacoub, James H. Scott
Map showing relative amounts of landslides in California
No abstract available.
Authors
Dorothy H. Radbruch, Kenneth C. Crowther
Micromineralogy of silver-bearing sphalerite from Flat River, Missouri
Detailed mineralogical and chemical study of sphalerite-rich lead ores from Flat River, Mo., confirms the presence of anomalous amounts of silver in the sphalerite. Although silver is closely associated with chlorine and no silver sulfide minerals were identified, geochemical considerations indicate the silver may be in the form of discrete submicron-size grains of sulfide rather than chloride. Ho
Authors
Charles M. Taylor, Arthur S. Radtke
Structural geology of the Quad-Wyoming-Line Creeks area, Beartooth Mountains, Montana
The Quad-Wyoming-Line Creeks area is in the northeastern part of the Beartooth Mountains of Montana. The rocks of the area consist mainly of banded migmatite, granitic gneisses, amphibolite, quartzite, and agmatite; small amounts of biotite schist and biotite gneiss, iron-silicate rocks, ultramafic rocks, mafic dikes, and felsic porphyries are also present. Quartzite outcrops continuously around t
Authors
Lawrence C. Rowan
Photogrammetry with surface-based images
Stereoscopic pictures returned by surface-based imaging systems can be used to reconstruct the topography of landing sites on Mars and other planets. Large surface relief with respect to distance and the large scale variation inherent in surface-based pictures produce problems in stereoscopic measurement very different from those presented by high altitude photography. Optical-mechanical scanning
Authors
Raymond M. Batson
Geomagnetic reversals
Although decreasing rapidly, the earth's magnetic field is probably not now reversing.
Authors
A. Cox
The morphology and chronology of a landslide near Dillon Dam, Dillon, Colorado
Investigations were made of a landslide at the Dillon Dam site, Dillon, Colo., that included detailed laboratory and field analyses of the mineralogy, chemistry, and physical properties of landslide materials and the bedrock formations from which they were derived. These investigations provide an understanding of the relative importance of various factors contributing to the origin and reactivatio
Authors
E.E. Wahlstrom, T. C. Nichols
Geologic structure between the Murray fracture zone and the Transverse Ranges
The Murray fracture has been thought to extend ashore into the Transverse Ranges of California, but a geophysical study shows no evidence of structural continuity between these features. Instead, basement morphology typical of the Murray fracture zone ends where its known magnetic and bathymetric expression dies out. Similarly, east-west Transverse Range structures change direction so that they ar
Authors
Roland E. von Huene
Geologic setting of the lunar samples returned by the Apollo 11 mission
The Apollo 11 LM landed approximately 20 km south-southwest of the crater Sabine D in the southwestern part of Mare Tranquillitatis ( fig. 3-1 ). The landing site is 41.5 km north-northeast of the western promontory of the Kant Plateau (ref. 3-1 ), which is the nearest highland region. The Surveyor 5 spacecraft is approximately 25 km north-northwest of the Apollo 11 landing site, and the impact cr
Authors
E.M. Shoemaker, N. G. Bailey, R. M. Batson, D.H. Dahlem, T.H. Foss, M. J. Grolier, E. N. Goddard, M. H. Hait, H. E. Holt, K.B. Larson, J. J. Rennilson, G. G. Schaber, D. L. Schleicher, H.H. Schmitt, R. L. Sutton, G.A. Swann, A. C. Waters, M.N. West
History of the geomagnetic field
Direct measurements of the direction and strength of the earth's magnetic field have provided a knowledge of the field's form and behavior during the last few hundreds of years. For older times, however, it has been necessary to measure the magnetism of certain rocks to learn what the geomagnetic field was like. For example, when a lava flow solidifies (at temperatures near 1000°C) and cools throu
Authors
Richard R. Doell