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Siliceous sponge spicules occur in deposits of Oligocene to Miocene age from Sites 627 and 628, north of Little Bahama Bank, Bahamas. Spicules are abundant in only two cores from Site 627 (Cores 101-627B-18X and 101-627B-19X, early to middle Miocene age), but are the predominant siliceous component in six cores from Site 628 (Cores 101-628A14H through 101-628A-19H, late Oligocene to middle Miocene age). Previous studies of siliceous sponge spicules recovered from Deep Sea Drilling Project sites were used to indicate paleobathymetry, evidence of redeposited shallow-water material, and general stratigraphic position. The most obvious and potentially valuable aspect of siliceous spicule distribution is that the two main groups, tetraxons and triaxons (hexactinellids), are formed by sponges most abundant in shallow (0-400 m) and deeper (> 4001000 m) waters, respectively. The predominance of tetraxonal spicules in samples from Sites 627 and 628 suggests origin from, as well as deposition in, relatively shallow waters. The presence of triaxonal (hexactinellid) spicules in samples from Site 627 and the Oligocene of Site 628 indicates slightly deeper conditions and/or less influx of periplatform material during deposition of those intervals. Spicules were also examined from the Miocene section at a nearby deep basin site (Site 534, Blake-Bahama Basin), and triaxonal (hexactinellid) spicules were consistently present.

Paleoenvironmental Significance of Siliceous Sponge Spicules from Sites 627 and 628, Little Bahama Bank, Ocean Drilling Program Leg 101