Surficial geologic maps play and important role in understanding the present sea floor and the processes that shape it. Between 1984 and 1991, over 1,700 bottom sample stations were occupied in the northwestern Gulf of Maine. Although the data were originally collected for a variety of research projects, contracts, and graduate student theses, they were eventually compiled as part of a Maine Geological Survey and University of Maine program to map the inner continental shelf of this region.
The purpose of this data layer is to make available a subset of a data set produced by the Maine Geological Survey and the University of Maine. This subset contains information for those samples with raw grain size data, and which are located on the inner continental shelf from the northwestern Gulf of Maine.
publication date
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384 Woods Hole Road
Please review the cross reference information for the original data set credit to Kelley and others (1998), and Larry Poppe for creating this ArcView shapefile.
All attributes were checked by the compilers in a consistent manner.
No additional checks for topological consistency were performed on this data.
Sample locations, grain-size data, textural classifications, and sample identifiers are provided for 1,739
Navigation was variously performed with Loran C (+/- 100 m accuracy) and dfferential GPS (+/- 10 m accuracy). No location-by-location differentiation is made between these navigational systems.
Textural and lithologic data from the northwestern Gulf of Maine were clipped from the whole Maine Geological Survey and University of Maine dataset from the Surficial Geology of the Maine Inner Continental Shelf map series in Excel and exported to an ASCII file. Stations and sediment data were imported from the ASCII text file to an ArcView table. The table was later converted to an event theme and saved as the final shapefile.
384 Woods Hole Road
Metadata imported.
Internal feature number.
ESRI
Feature geometry.
ESRI
Unique number assigned to each sample location
Scientist
Name used to identify samples
Scentist
Latitude coordinate of sample location
Scientist
Longitude coordinate of sample location
Scientist
Water depth in meters
Scientist
Classification code
Scientist
Lithologic/textural descriptions of the seafloor
Scientist
Percentage of gravel
Scientist
Percentage of sand in sample
Scientist
Percentage of silt in sample
Scientist
Percentage of clay in sample
Scientist
Percentage of mud (silt plus clay) in sample
Scientist
Mean of the grain size distribution in phi
Scientist
Standard deviation of the grain size distribution in phi units
Scientist
Bay or region where the sample was collected.
Scientist
384 Woods Hole Road
Although this data set has been used by the U.S. Geological Survey, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials.
ESRI point shapefile
Five files (barnhardt.shp, barnhardt.dbf, barnhardt.shx, barnhardt.sbx, barnhardt.sbn) comprising the ArcView point shapefile components, 'prj' and 'avl' files, metadata text file and browse graphic.
384 Woods Hole Road