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Year Published: 1974

Preliminary geologic map of Marin and San Francisco Counties and parts of Alameda, Contra Costa and Sonoma counties, California

Blake, M.C.; Bartow, J.A.; Frizzell, V.A.; Schlocker, J.; Sorg, D.; Wentworth, C.M.; Wright, R.H.
Preliminary geologic map of Marin and San Francisco Counties and parts of Alameda, Contra Costa and Sonoma counties, California; 1974; MF; 574; Blake, M. C., Jr.; Bartow, J. A.; Frizzell, V. A., Jr.; Schlocker, J.; Sorg, D.; Wentworth, C. M.; Wright, R. H.

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Year Published: 1974

Reconnaissance geologic map of the Hayfork Quadrangle, Trinity County, California

Irwin, W.P.
Reconnaissance geologic map of the Hayfork Quadrangle, Trinity County, California; 1974; MF; 576; Irwin, W. P.

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Year Published: 1974

Major chemical characteristics of Mesozoic Coast Range ophiolite in California

Sixty-four major element analyses of rocks representative of the Coast Range ophiolite in California were compared with analyses of other onland ophiolite sequences and those of rocks from oceanic ridges. The rocks can be classed in five groups harzburgite-dunite, clinopyroxenite-wehrlite, gabbro, basalt-spilite, and keratophyre-quartz keratophyre...

Bailey, E.H.; Blake, Jr., M.C.

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Year Published: 1974

Fresh lunar impact craters: Review of variations in size

Thirty-three morphologic characteristics are reviewed for fresh lunar impact craters wide than1 km. Bar graphs express the way each characteristic varies with crater size. The features are grouped as crater structure, ejecta, and downhill flow features. Major structural transition occur at diameters of about 15 and 200 km. Details of the ejecta...

Howard, Keith A.

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Year Published: 1974

Gravity anomalies in the Galapagos Islands area

No abstract available.

Watts, Anthony B.; Cochran, J.R.; Case, J.E.; Ryland, S.L.; Simkin, Tom; Howard, Keith A.

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Year Published: 1974

Lunar basin formation and highland stratigraphy

Multiring impact basins, formed after solidification of the lunar crust, account for most or all premare regional deposits and structures expressed in the lunar landscape and for major topographic and gravity variations. A fresh basin has two or more concentric mountain rings, a lineated ejecta blanket, and secondary impact craters. Crackled...

Howard, Keith A.; Wilhelms, D.E.; Scott, D.H.

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Year Published: 1974

Origin of Franciscan melanges in Northern California

In northern California, chaotic Franciscan melange occurs beneath the overlying ophiolite and Great Valley Sequence. Identical melanges occur to the west, separating well-bedded, coherent Franciscan units that differ markedly in age. Detailed studies in several places indicate that these melanges mark the boundaries of imbricate thrust sheets, and...

Blake, M. Clark; Jones, D.L.

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Year Published: 1973

Preliminary geologic analysis of the Apollo 17 site

No abstract available.

Preliminary geologic analysis of the Apollo 17 site; 1973; OFR; 73-313; Geological Survey (U.S.), Apollo Lunar Geology Investigation Team

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Year Published: 1973

Preliminary report on the geology and field petrology at the Apollo 17 landing site

No abstract available.

Preliminary report on the geology and field petrology at the Apollo 17 landing site; 1973; OFR; 73-314; Geological Survey (U.S.), Apollo Lunar Geology Investigation Team