Facies Interpretations in Mississippi Delta Borings

Lankford, Robert R.; Shepard, Francis P.

doi:10.1086/626674

Cited by 10 publications

(2 citation statements)

References 8 publications

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“…KOLB and VAN LOPIK (1958) did not note this contact in their description of cores taken by the U. S. Army Engineers for the Mississippi River-Gulf outlet channel. LANKFORD and SHEPARD (1960), however, did note a faunal change to a marsh fauna, thus corroborating the conclusion of a subaerial surface at this level. A general decrease in water content in the cores also is present at the contact, suggesting a period of dessication.…”

Section: Geological Significancesupporting

confidence: 81%

“…Lithology, nature of layering, presence and nature of shells and wood fragments, and color or color variations of the sediments are criteria for recognition of facies units (Fig.4, 5). These criteria have been discussed at length as observable features of sediment samples (TREADWELL, 1955;SCRUTON, 1955;SHEPARD, 1956;MOORE and SCRUTON, 1957;VAN STRAATEN, 1959;LANKFORD and SHEPARD, 1960;forexample).…”

Section: Resultsmentioning

confidence: 99%

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FACIES DELINEATION BY ACOUSTIC‐REFLECTION: NORTHERN GULF OF MEXICO¹

Curray

Moore

1963

Sedimentology

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This study in Breton, Chandeleur, and Mississippi Sounds combines the use of bottom‐penetrating acoustic‐reflection records with lithologic descriptions of piston and gravity cores for construction of sections showing boundaries of depositional facies units. Continuous acoustic records delineate morphology of buried horizons (lithologic breaks, changes in density, water content, or degree of lithification). Lithologic descriptions give internal structure and variations of particle size, color, components such as shells and wood fragments, and consistency. With these criteria, deposits were divided into the major broad facies units of sound deposits, delta deposits, basal and barrier island sands and Pleistocene clays. Delta deposits are recognized as being of two distinct periods of the St. Bernard subdelta, which has subsided beneath Breton and Chandeleur Sounds. Probable buried distributaries of these delta phases are recognized in the records. Sand bodies connecting islands in Mississippi Sound are suggested as remnants of an extensive barrier island which fronted the area previous to the subdelta growth and had its beginnings about 7,000 B. P.

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Section: Geological Significancesupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%