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Hole 391C (28°13.61'N, 75°37.00'W) drilled during Leg 44 is located just east of the Blake Plateau east of the Blake Escarpment in the Blake-Bahama Basin, which is separated from the Hatteras Abyssal Plain by the Blake-Bahama Outer Ridge. The water depth at the location is 4963 meters, and the hole penetrated 1412 meters of sediment. A.W.Gorody (DSDP East Coast Repository at Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York) collected 21 samples, of which 17 contained aptychi, two remains of ammonites, and one a rhyncholite. The material was received at the Museum of Natural History in Basel during April 1976. The prime objective at the present stage of investigations on aptychi is to attempt correlations between holes. Hole 391C continuously cored section covering Late Jurassic and Early Cretaceous providing an opportunity to establish some correlation lines on the basis of aptychi from the Blake-Bahama Basin to Hole 387 of Leg 43 on the western Bermuda Rise, and to Hole 367 of Leg 41 on the Cape Verde Basin (Figure 1). Fourteen species of aptychi suggesting an Early Cretaceous age, a rhyncholite of presumably Oxfordian age, and a few remains of ammonites were recovered from Hole 391C from an interval of 207 meters. New aspects regarding the stratigraphic position of single species, and information regarding the vertical distribution of groups of aptychi consisting of related species resulted from the new material (Figure 2). Of interest are indications of possible phylogenetic connections within certain groups of aptychi, as for instance the Lamellaptychus mortilleti group from the Berriasian present in the Holes 387 and 391C (Figure 3).

Aptychi (Ammonoidea) from the Early Cretaceous of the Blake-Bahama Basin, Leg 44, Hole 391C, DSDP