The principal objective at this site was the recovery of Mesozoic sediment and a sample of Horizon B (or basement). The location chosen for drilling is about 40 nautical miles southeast of San Salvador in 4914 meters of water. Aside from the possibility of recovering the oldest Atlantic sediment, drilling at this site was expected to produce interesting samples for comparison stratigraphically and lithologically with those of Holes 4 and 5 of Leg 1.

From 1983 until 1989 NOAA-NCEI compiled the NOAA-MMS Marine Minerals Geochemical Database from journal articles, technical reports and unpublished sources from other institutions. At the time it was the most extended data compilation on ferromanganese deposits world wide. Initially published in a proprietary format incompatible with present day standards it was jointly decided by AWI and NOAA to transcribe this legacy data into PANGAEA. This transfer is augmented by a careful checking of the original sources when available and the encoding of ancillary information (sample description, method of analysis...) not present in the NOAA-MMS database.

Supplement to: Hollister, Charles D; Ewing, John I; Habib, Daniel; Lancelot, Yves; Luterbacher, Hanspeter; Paulus, F J; Poag, C Wylie; Wilcoxon, James A; Worstell, Paula J (1972): Site 99: Cat Gap. In: Hollister, C.D.; Ewing, J.I.; et al., Initial Reports of the Deep Sea Drilling Project, Initial Reports of the Deep Sea Drilling Project, U.S. Government Printing Office, XI, 51-73