U.S. GEOLOGICAL SURVEY

                BRANCH OF ATLANTIC MARINE GEOLOGY



                      SEDIMENT DATABASE



     This database contains data on collection, location, description, and

texture of samples taken by the marine sampling programs of the Branch of 

Atlantic Marine Geology of the U.S. Geological Survey.  Most of the samples 

are from the Atlantic Continental Margin of the United States, but some 

are from as diverse locations as Lake Baikal, Russia, the Hawaiian Islands

region, Puerto Rico, the Gulf of Mexico, and Lake Michigan.  The database

contains data for about 12,000 samples and includes texture data for 

approximately 2300 samples taken or analyzed by the Atlantic Continental 

Margin Program, a joint U.S. Geological Survey/Woods Hole Oceanographic 

Institution project conducted from 1962 to 1970. This program was under 

the direction of K.O. Emery from 1962 to 1968, and the data were 

originally reported in Hathaway (WHOI Report 71-15, 1971).  



     Texture data for approximately 8000 samples analyzed by the Sediment 

Laboratory of the Branch of Atlantic Marine Geology of the U.S. Geological 

Survey, Woods Hole MA. after 1980 are also included. Considerable data 

from the period 1970 to 1980 are yet to be digitized and added. 



   The files in this subdirectory, ASCGROUP, contain the data and headings 

for the tables of data in uncompressed ASCII format.



IMPORTANT NOTE:



    This database is in "flat file" form, which means that it is not 

"normalized". While this is considered inefficient from the point of view 

of database management, it is the simplest way of presenting the basic data.  

Since I know neither the software capabilities of the user nor the 

probable uses that may be made of the data, I have made no attempt to split 

the files to reduce blank regions or remove redundancies. 

The same data may be presented in more than one form, e.g.: phi class 

frequencies and cumulative frequencies. Even though each form can be derived 

from the other, presenting both eliminates the need for the user to program  

formulas to calculate one from the other.  Although this may violate the 

principal of having a single entry for any given data item, it greatly 

simplifies the use of the file.  If the user wishes to make the data base 

more efficient through "normalization", I feel that it is better that this 

be done by the user to fit both the applications available to the user and 

the database structural logic that is familiar to the user.  The price paid 

for the "flat file" approach is additional storage space, rather wide  

records, and the possibility that corrections made here at the source may

fail to be carried through to all forms of the data affected.  We will 

make every effort to see that this last possibility does not happen.

   

    Samples of the data (about 25 records of the database) are given in

the files named "sedsampl.???" where ??? = csv for comma separated values

format; tsv for tab separated values. 

 

  See file STRUCTUR.DOC for description of the files and their data.        



                       USE OF THE FILES



1) IF YOU DO NOT HAVE A DOS/WINDOWS COMPATIBLE COMPUTER, e.g

   a UNIX or MACINTOSH PLATFORM USE THIS ASCGROUP DIRECTORY



    If applications capable of using or importing .DB (Paradox) file 

structure are not available to the user, or if the self-extracting files 

(usable with IBM PC-compatible computers under the DOS operating

system) in the PCZGROUP directory will not work, the user can download 

the files from this ASCGROUP directory.  These files are provided to 

allow importation of the data into applications available in systems 

other than IBM PC-compatible computers. Together they occupy about

13 megabytes of disk space. If the user wishes to test the data first

sample files of about 25 lines are available. These are named SEDSAMPL.CSV

for comma separated values, and SEDSAMPL.TSV for tab separated values. 



2) IF YOU HAVE AN IBM-PC COMPATIBLE COMPUTER YOU MAY USE THE COMPRESSED

   FILES IN DIRECTORY PCZGROUP, OR IN PDXGROUP (IF YOU HAVE PARADOX)



    If an IBM compatible computer using DOS is available, the user can

download either the compressed files in the PCZGROUP subdirectory (see the 

README.1ST file in that directory) or the uncompressed files from this 

subdirectory (ASCGROUP), however we recommend that the compressed files be 

used to save download time; they are self-extracting in the DOS environment.  



     However, if an application which can use .DB format database 

files is available, download the self-extracting compressed file SEDPDOX.EXE 

(2.3 Mb) from the PDXGROUP subdirectory.  See the README.1ST file in that 

subdirectory. You may test to see if a .DB format file can be read by your 

application by trying the SEDSAMPL.DB file in this (ASCGROUP) subdirectory.



FOR FURTHER INFORMATION



     Contact:

                  Polly Hastings 
                  U.S. Geological Survey

                  384 Woods Hole Road

                  Quissett Campus 

                  Woods Hole, MA 02540-1598

                  

                  Tel. 508 457 2289

                  e-mail phastings@nobska.er.usgs.gov





This database was assembled by John C. Hathaway, Geologist Emeritus, 

U.S. Geological Survey, and is now managed by Polly Hastings 


Version of

March 7, 1994



                              DISCLAIMER





This database, identified as Branch of Atlantic Marine Geology Sediment 

Database, has been approved for release and publication by the Director 

of the  USGS. Although this database has been subjected to rigorous review 

and is substantially complete, the USGS reserves the right to revise the 

data pursuant to further analysis and review.  Furthermore, it is released 

on condition that neither the USGS nor the United States Government may be 

held liable for any damages resulting from its authorized or unauthorized 

use.         

                                   END