Isopachs of Quaternary Deposits, Fremont 1- by 2-degree Quadrangle and Part
of Omaha Quadrangle, Nebraska, Digitized from a Published 1:250,000-Scale Geologic
Map
By Ronald B. Zelt and Erik J. Patton
ABSTRACT:
A geologic map showing the isopachs of quaternary deposits in the Fremont
and part of the Omaha, Nebraska, 1- by 2-degree quadrangles was published at a
scale of 1:250,000 in 1975 (Burchett and others, 1975). This report describes
the conversion of the quaternary thickness data into a digital geographic data
set. A film separation of the published isopachs was scan-digitized and
processed to produce digital geographic data. Geographic feature attributes
and data-set documentation also are included in the digital data set. The
digital geographic data are formatted for distribution in accordance with the
Spatial Data Transfer Standard approved by the U.S. National Institute of
Standards and Technology.
DESCRIPTORS: Geology, Quaternary, Nebraska
CITATION:
Zelt, R.B., and Patton, E.J., 1995, Isopachs of Quaternary Deposits,
Fremont 1- by 2-degree Quadrangle and Part of Omaha Quadrangle,
Nebraska, Digitized from a Published 1:250,000-Scale Geologic Map:
U.S. Geological Survey Open-File Report 95-721, diskette.
For additional information Copies of the report can be
write to: purchased from:
District Chief U.S. Geological Survey
U.S. Geological Survey, WRD Earth Science Information Center
406 Federal Building Open-File Reports Section
100 Centennial Mall, North Box 25286, MS 517
Lincoln, Nebraska 68508 Denver Federal Center
Denver, CO 80225