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Lower Cretaceous samples from Holes 417D and 418B in the Bermuda Rise were investigated for Calcisphaerulidae and spherules incertae sedis. It was thought that they may be present at these sites, as is the case in sediments of comparable age in several sites from the Indian Ocean (Leg 27) with Calcisphaerulidae present in only one site from the South Atlantic (Leg 40). Apparently because of strong dissolution effects, no Calcisphaerulidae were seen in the investigated Bermuda Rise samples. However, Aptian Sample 417D-21-3, 109-111 cm was found to contain well-preserved, small spheres of 60 to 70 μm in diameter, virtually identical to those described and figured from the Aptian and Albian of the Indian Ocean, DSDP Sites 260, 261, and 263 (Bolli, 1974). Similarly, the Bermuda Rise specimens consist predominantly of calcite and react very strongly to diluted HC1. The washed residue which contained the spheres is very poor in CaCθ3, as are those from the Indian Ocean. It contains only occasional, strongly corroded fragments of calcareous benthic foraminifers (nodosariids, lenticulinids). This and the presence of some fish debris points to strong CaCθ3 dissolution of the sediment. However, there is an abundance of moderately preserved calcareous nannoplankton with its higher resistance, including the zonal marker Parhabdolithus angustus which is indicative of an Aptian age.

Aptian Calcareous Spherules Incertae Sedis from Deep Sea Drilling Project Leg 51, Hole 417D, Bermuda Rise