Status of geological and geophysical investigations on the Atlantic and Gulf Coastal Plain

Leet, L. Don

doi:10.1130/gsab-51-873

Cited by 3 publications

(1 citation statement)

References 3 publications

(6 reference statements)

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“…He reported four definite levels above the present flood plains of all the major streams in Holmes and vVashington counties, Florida . Prior to Vernon's work on stream terraces in \iVest Florida, H. N. Fisk ( 1938, 1939, 1940 reported on the occurrences of stream terraces in Louisiana. The reader is referred to these two workers' reports for a discussion on the origin and d escription of stream t erraces.…”

Section: Stre Am T Erracesmentioning

confidence: 99%

Geology of the area in and around the Jim Woodruff Reservoir

1958

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Section: Stre Am T Erracesmentioning

confidence: 99%

Geology of the area in and around the Jim Woodruff Reservoir

1958

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A gravity‐profile across the central Appalachians, Buckhannon, West Virginia, to Swift Run Gap, Virginia

Hammer¹,

Heck

1941

Eos Trans. AGU

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In recent years a considerable amount of geophysical work in the northern Appalachians and eastward across the crystalline rocks of the Piedmont and the Atlantic Coastal Plain has been reported and discussed, notably by Ewing [see 1, 2, 3 of “References” at end of paper], Leet [4], Longwell [5,6], Miller [7], Nettleton [8], Straley [9], Swick [10,11], and Woollard [12–18]. Thorn [19] has stated that this is one of the most favorable testing grounds in the world for geophysics in the study of fundamental geological problems as a great variety of gentle and steep folds, faults, and types of rock are encompassed in a relatively narrow belt. The present paper adds to the geophysical study of this geologic province by presenting the results of a closely spaced profile of gravimeter‐stations across the central Appalachians. The work was done at the specific suggestion of Dr. Paul H. Price, State Geologist of West Virginia, to Dr. E. A. Eckhardt of the Gulf Research and Development Company. The desirability of such work has been recognized for some time [10,19,20].

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Seismic refraction shooting in an area of the Eastern Atlantic

Hill

1952

Phil. Trans. R. Soc. Lond. A

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For the experiments described in this paper a new method of seismic refraction shooting was developed. With this method hydrophones suspended at a depth of about 100 ft. below the surface of the sea acted as receivers for the compressional waves developed by depth charges exploding at a depth of approximately 900 ft. The hydrophones were connected with sono-radio buoys which radio-transmitted the electrical signals to a recording system in the ship from which the charges were dropped. Four buoys were in use simultaneously, distributed at differing ranges from the ship. The experiments were carried out at three positions in an area of the eastern Atlantic around the point 53° 50' N, 18° 40' W, where the water depth is approximately 1300 fm. (2400 m). The results showed that the uncrystalline sedimentary layer in this area varied in thickness from 6200 ft. to 9700 ft. (1900 to 3000 m), and that the velocity of compressional waves in it increased from the value for sea water, 4900 ft./s (1.5 km/s), at the surface with an approximately constant gradient of 2.5/s to a limiting value of 8200 ft./s (2.5 km/s). Below the sedimentary layer there was a crystalline rock with compressional wave velocity of approximately 16500 ft./s (5.0 km/s) and of thickness varying between 8800 ft. (2700 m) and 11100 ft. (3400 m). The base of this layer was in both determinations at approximately 25500 ft. (7800 m) below sea-level. The lowest layer concerning which information was obtained gave a value for the compressional wave velocity of about 20500 ft./s (6.3 km/s), but was of undetermined thickness. The characteristics of the sedimentary layer were such as might be expected for a continuous succession of deep-sea sediments, the thickness on this basis being such as to indicate the long existence of the ocean in this area. On the other hand, it is possible that it represents a downwarped continental shelf. The layer below the sedimentary layer has a compressional wave velocity which is low for an igneous rock at this depth, and it is probable that it represents a crystalline sedimentary rock. From the evidence it is not possible to determine whether this rock is of continental or deep-sea origin. The lowest layer of these experiments is unlikely to have a constitution similar to that of the European granitic layer, since the compressional wave velocity in it would, on this hypothesis, be exceptionally high. The value is, however, close to that calculated by Jeffreys for the intermediate layer.

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Status of geological and geophysical investigations on the Atlantic and Gulf Coastal Plain

Cited by 3 publications

References 3 publications

Geology of the area in and around the Jim Woodruff Reservoir

Geology of the area in and around the Jim Woodruff Reservoir

A gravity‐profile across the central Appalachians, Buckhannon, West Virginia, to Swift Run Gap, Virginia

Seismic refraction shooting in an area of the Eastern Atlantic

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