National Geophysical Data Center 
National Environmental Satellite, Data, 
and Information Service 
National Oceanic and Atmospheric 
Administration 
Code E/GC3 
325 Broadway 
Boulder, CO 80303 
(303) 497-6338, FTS 320-6338 
Kinds of Data 
Marine Geology and Geophysical Data Set 
Location: Outer Continental Shelf of the United States, 
includes Atlantic coast, Pacific coast, Gulf of 
Mexico, and Alaska 
Description of Data: The Marine Geology and Geophysical Data Set contains 
more than 60 sets of data files provided by the US Geological Survey (USGS), 
the Bureau of Land Management (BLM), and other agencies for public dissemina- 
tion. The majority of the collected data can be characterized by two cate- 
gories: seismic reflection data, gathered by the USGS to identify potentially 
hazardous geologic structures or other constraints to offshore oil and gas 
exploration; and well logs and auxiliary information obtained from privately 
drilled test wells. 
The content of each data file varies; however, the geophysical data files 
usually contain subbottom profiles, sparker recordings, sidescan sonar 
records, and supporting technical reports and interpretative maps. Well log 
data contain core analysis reports and information on physical formation. 
Response Format: Most of the data are on microfilm (35-mm), 
while most of the technical reports are on 
microfiche. Maps are available in either sepia 
or blackline forms. The cost of the data varies 
from hundreds of dollars to thousands of 
dollars. Users are urged to send inquiries to 
the National Geophysical Data Center (NGDC) for 
specific site information and Data Announcements 
associated with the particular data file. 
Point of Contact: National Geophysical Data Center 
National Environmental Satellite, Data, 
and Information Service 
National Oceanic and Atmospheric 
Administration 
Code E/GC3 
325 Broadway 
Boulder, CO 80303 
(303) 497-6338, FTS 320-6338 
VIII-2 
