USGS Science⌕ Search

Geology topics

Terry W. Offield

Publications and source records attributed to Terry W. Offield.

45 records · Page 3Linked to original sources
USGS1970

Remote Sensor Application Studies Progress Report, July L, 1968 to June 30, 1969. Controlled Field Experiments

Field Sites have been selected for controlled experiments to analyze physical and chemical parameters affecting the response of electromagnetic radiation to geological materials. Considerations in the selection of the sites are the availability of good exposures of nearly monomineralic rocks, level of geologic understanding, and ease of access. Seven sites, where work is underway or planned, contain extensive outcrops of the following rocks: stanstone, limestone, dolomite, and gypsum. Field measurement of quartz have been conducted at four sites.

Report↗
USGS1970

Remote sensor application studies report, July 1, 1968 to June 30, 1969: Remote sensing reconnaissance, Mill creek area, Arbuckle Mountains, Oklahoma

As part of the U.S. Geological Survey's Remote Sensor Application Studies program, infrared images and several kinds of photographs were obtained on reconnaissance flights over two areas in the Arbuckle Mountains near Mill Creek, Oklahoma. These data were used in a preliminary investigation (1) to determine the diagnostic reflection and emission characteristics of various rock types, and (2) io evaluate the perturbing influence of atmospheric conditions, surface coatings, rock texture, and topography on the observed reflected and emitted energy in the thermal infrared (8-14μ) part of the spectrum

Oklahoma↗
USGS1970

Geologic map of the Fra Mauro region of the Moon Apollo 14 pre-mission maps

The accompanying map shows the geology of the Fra Mauro site -- the landing site for the Apollo 14 mission to the Moon. The site lies about 80 km north of the ancient crater F ra Mauro, in a north-south belt of the predominantly hummocky uplands terrain geologically distinct from the mare terrains of the earlier Apollo landing sites. The front face of the Moon was mapped at a scale of 1:5,000,000 by Wilhelms and McCauley (1970) ; the regional setting around the Fra Mauro site is resented on a 1:250,000-scale map by Eggleton (1970). Detailed geology around the proposed landing area is shown on a scale of a 1:5,000 -scale map by Offield (1970).

IMAP↗
USGS1970

Geologic map of the Fra Mauro region of the Moon-- Apollo 13

The accompanying map shows the geology of the Fra Mauro site- the proposed landing site for the Apollo 13 mission to the Moon. This site lies about 80 km north of the ancient crater Fra Mauro, in a north-south belt of predominantly hummocky uplands terrain geologically distinct from the mare terrains of the earlier Apollo landing sites. The geologic outline of the front face of the Moon is shown by Wilhelms and McCauley (1969); the regional setting around the Fra Mauro site is presented on a 1:250,000-scale map by Eggleton (1970). Detailed geology around the proposed landing ellipse is shown on a 1:5,000 scale map by Offield (1970).

Open-File Report↗
USGS1968

Shatter cones at Sierra Madera, Texas

Shatter cones abound in the central uplift of Sierra Madera and they occur as far as 6.5 kilometers from the center. Apical angles average near 90 degrees. Whole cones and full cones represented by diversely oriented cone segments in any structural block show relatively uniform orientations of axes and a dominant direction of point. The cones predate faulting and folding in the central uplift, and, when beds are restored to horizontal, most cones point inward and upward, a pattern that supports the hypothesis of an impact origin.

Texas↗