Accession Number : AD0768791

Title :   Pleistocene-Holocene Sediments Interpreted by Seismic Refraction and Wash-Bore Sampling, Plum Island-Castle Neck, Massachusetts.

Descriptive Note : Technical memo.,

Corporate Author : COASTAL ENGINEERING RESEARCH CENTER FORT BELVOIR VA

Personal Author(s) : Rhodes,Eugene G.

Report Date : JUL 1973

Pagination or Media Count : 85

Abstract : The wash-bore method of soil sampling was found to be an excellent technique for subsurface study in coastal areas. Phenomena to be considered when interpreting seismic refraction records include (a) the 'blind zone', (b) the non-zero time intercept, (c) time gaps in the time-distance photo over buried peat, and (d) variable thicknesses of dry sand layers. The seismic method successfully located Pleistocene and bedrock topography. However, glaciomarine clay did not show a seismic contrast with respect to sandy, water-soaked sediments. Topography exposed during lower sea level has a dominant influence on modern coastal geology. Barrier islands became anchored on Pleistocene features as the sea level rose and deposition occurred in the estuaries behind the barrier beaches. Major channels of the estuaries migrated landward with the sea-level rise. (Modified author abstract)

Descriptors :   (*COASTAL REGIONS, *MASSACHUSETTS), SAMPLING, STRATIGRAPHY, CLAY, MINERALS, ESTUARIES, BEACHES

Subject Categories : Physical and Dynamic Oceanography
      Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE