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During Leg 50 of the Deep Sea Drilling Project (DSDP/IPOD), we used the Schlumberger Ltd. wireline well logging tools, and the Ericson-von Herzen Temperature Probe. The Schlumberger logs were grouped in each lowering operation as follows: 1) Borehole Compensated Sonic Log (BHC), Caliper (unsuccessful), Gamma Ray (GR), and Maximum Reading Thermometer (MRT). 2) Compensated Neutron Log (CNL), Compensated Formation Density Log (FDC), GR, and MRT. 3) Dual Induction Log (DIL), Laterolog-8, GR, and MRT. 4) High Resolution Temperature Log (HRT). These tools and various problems associated with their use are discussed below. Investigators may obtain the following logging data from the DSDP Data Repository: 1) Ozalid copies of original analog records at scales of 1:200 and 1:1000. 2) The analog records for Hole 415, which were not recorded on magnetic tape at the time of logging, were digitized and placed on magnetic tape by Schlumberger Ltd.; each original log is available on magnetic tape. The GR was run singly in Hole 415A and was recorded on magnetic tape at the drill site. 3) The BHC, GR (one tape), CNL-FDC, GR, (two tapes), and DIL, Laterolog-8, and GR (one tape) for Hole 416 were recorded on magnetic tapes at the drill site. The HRT analog record was later digitized and placed on magnetic tape by Schlumberger Ltd. 4) The Hole 415 BHC, CNL, FDC, DIL, Laterolog-8, and GR are all plotted to a single depth file adjusted to the same depth using GR for stratigraphic control by Schlumberger Ltd., and all data are available on a single Schlumberger Ltd. standard library tape. An additional standard library tape is available, which is corrected for borehole environment. Environmental conditions, assumptions, and tool problems are given in Table 1. These "borehole environment" corrections are the borehole-related adjustments in Schlumberger's (1972b) "Log Interpretation Charts." 5) The Hole 416A BHC, CNL, FDC, DIL, Laterolog-8, and GR are also available as a Schlumberger standard library tape and a standard library tape corrected for the borehole environment (chart corrections in Schlumberger, 1972b, are applied). Assumptions, tool problems, and environmental data are listed in Table 1. TABLE 1 Tools, Abbreviations, Caliper Problems, Estimated Hole Diameter, and Estimated Temperature Gradient Within the Sea Floor

Schlumberger Well-Log Equipment and the Ericson-Von Herzen Temperature Probe Used During Deep Sea Drilling Project Leg 50