USGS OFR 2002-2: Geological Framework Data from Long Island Sound, 1981-1990: A Digital Data Release

SHIP:	R/V Atlantic Twin
CRUISE:	AT-84
CORE:	LISAT-6
LENGTH RECOVERED:	783 cm
PENETRATION:	29'
NUMBER OF SECTIONS:	5
LOCATION:	Stratford Shoal, western Long Island Sound
LATITUDE:	41^o 05.03' N
LONGITUDE:	73^o 06.33' W
LORAN:	26650.5, 43987.1
COMMENTS:	Seismic line for this core is Line AT#5 (sparker). This lines runs from 0948-0958 hrs. Core at 0955 hrs. on record. Core into lake clay (site III-1 on uniboom record line 17, UCONN 84-1). Section 1 - near the bottom is the lake clay contact - contains a concretion.
PENTROMETER RECORD:	Rapid 0-20'; moderate 20'-end
0-148 cm (Section 1) -	0-140 cm: very dark gray, 5Y 3/1. 0-48 cm: large quartz pebbles prevalent, with shell hash in silty clay and sand. 48-145 cm: no pebbles, abundant shell hash in silty clay and fine sand, very porous (air around shell fragments). 140-148 cm: lake clay varves, dark layers are brown - dark brown 7.5YR 4/2; light layers are brown, 7.5YR 5/4, clay or silty clay, no apparent difference in grain size, lighter layers are smoother; darker zones are denser. Clay concretion near bottom of section.
148-295 cm (Section 2) -	Clay, lake clay varves, dark layers are brown - dark brown 7.5YR 4/2; light layers are brown, 7.5YR 5/4, varves are mostly 1.5-2 cm in wavelength, light layers are always thinner (0.5-0.7 cm) than the dark layers (1.0-1.2).
295-448 cm (Section 3) -	Clay, lake clay varves, dark layers are brown - dark brown 7.5YR 4/2; light layers are brown, 7.5YR 5/4, varves are mostly 1.5-2 cm in wavelength, light layers are always thinner (0.5-0.7 cm) than the dark layers (1.0-1.2). Varves are more disturbed than in overling section (2-3 cm convex upward).
448-601 cm (Section 4) -	Clay, lake clay varves, dark layers are brown - dark brown 7.5YR 4/2; light layers are brown, 7.5YR 5/4, varves are mostly 2-3 cm in wavelength, light layers are usually thinner than the dark layers, 58 couplets in section, very convex upward. Dark layers 5 and 6 cm partly due to distortion in the intervals 505-511 cm and 513-517 cm, respectively.
601-692 cm (Section 5A) -	Clay, lake clay varves, dark layers are brown - dark brown 7.5YR 4/2; light layers are brown, 7.5YR 5/4, varves are mostly 2-3 cm in wavelength, greater wavelengths at 652, 656, and 663 cm.
692-783 cm (Section 5B) -	Clay, lake clay varves, dark layers are brown - dark brown 7.5YR 4/2; light layers are brown, 7.5YR 5/4, varves are mostly 1-2 cm in wavelength, thicker dark layers at 704.5-710.5, 756-759.5, and 773-777 cm.

Prepared in cooperation with with the Connecticut Department of Environmental Protection