Vibracore 27V1, north coast

Upward-coarsening succession of vaguely-laminated to bioturbated, medium- to coarse-grained, algal/coral/foraminifera carbonate sand: massive appearing (owing to extensive bioturbation) with oriented large, disarticulated and non-abraded pecten bivalves (Chlamys sp., 1.5-2.5 cm; subparallel to bedding and mostly concave down); light olive gray (5Y6/1) to moderate yellowish brown (10YR5/4) in upper 0.7 m); moderate sorting; sand size clasts angular to rounded; composed mainly of a mix of calcareous algae (36.0-42.5%), coral fragments (23.5-33.0%) and foraminifera (16.5-19.0%); common carbonate rock fragments (3.5-7.5%); minor echinoid fragments (1.0-2.0%), mollusks (2.0-3.5%) and Halimeda (0.5-3.5%). Carbonaceous, silty and slightly sandy mudstone with thin (2-3 mm) layers of highly carbonaceous mud and thin sandy layers (1-2 cm thick); probable burrows (sand-filled); brownish gray to black (5YR4/1-2/1 & N1). Thin, muddy, poorly-sorted, medium- to coarse-grained, olive gray (5Y4/1) sand at base with foraminifers and shell fragments.