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Sediments recovered from Hole 918D on the continental rise of the Greenland Margin were found to contain siliceous sponge spicules, silicoflagellates, and ebridians. An extreme fossil-barren interval occurred in lower Miocene and upper Miocene sediments of the core, with sponge spicules occurring in the middle Miocene. Though generally rare, the sponge spicules were morphologically diverse, with monaxons being the most abundant. Other morphologies and an undescribed spicule type were found. Representatives of several silicoflagellate genera were found in a narrow horizon of the upper Pliocene. The silicoflagellates were of a variety of ages, showing that this layer has been reworked. This interval also included two large ebridians, Triskelion gorgon and Adonnadonna primadonna, that have not been previously described from the North Atlantic. od t no vesns specolute ugh sechisin, om red f the onge ere 31 s; 8Dcalizes rg, pisify hlpes hich ave triINTRODUCTION Ocean Drilling Program (ODP) Leg 152 recovered sediment samples from six sites off the Greenland coast in order to study the rift volcanism and history of glaciation of the area. These sites were on a northwest-southeast transect across the East Greenland Margin, approximately 130 km from the Greenland coast near the center of a seaward-dipping reflector sequence (SDRS) (Fig. 1). A diverse assemblage of siliceous sponge spicules were found in middle Miocene sediments from Site 918D. The spicules were not generally abundant but were well preserved. The assemblage was dominated by monaxons with other spicule morphologies representing a fraction of total spicule abundance. The abundance and diversity of sponge spicules at Hole 918D are tabulated in this study (Table 1). Sponge spicules from deep ocean sediments have been studied infrequently. The results of this study can be compared to those of McCartney (1987, 1990), Ahlbach and McCartney (1992) and Zolnik et al., (1992); see McCartney (1990) for a tabulation of other sponge spicule literature from deep ocean studies. These studies show a generally similar diversity, with monaxons being the predominant spicule group. Palmer (1988) and Ivanik (1983) found abundant tetraxonal and triaxonal spicules and used their relative abundances to make paleobathymetric interpretations, but these spicule types were not abundant in this study.

Siliceous sponge spicules, silicoflagellates, and ebridians from Hole 918D, continental rise of the Greenland Margin