Full Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Contourites in Lake Superior.
Author Johnson, T. C. ; Carlson, T. W. ; Evans, J. E. ;
CORP Author Minnesota Univ., Minneapolis. Dept. of Geology and Geophysics.;Environmental Research Lab.-Duluth, MN.
Year Published 1980
Report Number EPA-R-805172; EPA-600/J-80/447;
Stock Number PB84-142447
Additional Subjects Sediments ; Water flow ; Lake Superior ; Geological sedimentation ; Seismic reflection method ; Profiles ; Sands ; Sampling ; Kewaenaw Peninsula ; Particle size ; Reprints ; Contourites
Library Call Number Additional Info Location Last
NTIS  PB84-142447 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 9p
Abstract Contour currents influence sedimentation in an area 15 km wide and 65 km long at the base of the slope off the Keweenaw Peninsula in Lake Superior, northwestern Michigan. Seismic-reflection profiles (3.5 kHz) from this area show distinct wavy reflectors in a scoured trough at a depth of 200 m at the base of the slope, hyperbolic echoes adjacent to the trough, and overlapping echos farther lakeward. These acoustic features are identical to those in marine environments where contourites are deposited. Box cores from the lakeward margin of this area contain what appeared to be contourites: irregular, thin sand layers with sharp upper and lower contacts, interbedded with sandy clay. This is the first report of contourites in a lacustrine environment.
Availability Notes Pub. in Geology 8, p437-441 1980.
NTIS Title Notes Journal article.
Title Annotations Reprint: Contourites in Lake Superior.
PUB Date Free Form c1980
Category Codes 8G; 8H; 48F; 48G
NTIS Prices Not available NTIS
Primary Description 600/03
Document Type NT
Cataloging Source NTIS/MT
Control Number 409018058
Origin NTIS
Type CAT