Geologic formations for the 1:250,000-scale Sherman quadrangle in Texas and Oklahoma. The data was created by the U.S. Geological Survey for a regional groundwater modeling project and is based on the 1967 Geologic Atlas of Texas, revised in 1991. It was reviewed for topological consistency and attribute accuracy against source maps.
Use Cases
- Model groundwater flow in the Lake Texoma watershed using geologic formation boundaries as input layers.
- Create a geologic map of north-central Texas by visualizing the polygon features representing different rock units.
- Calculate approximate surface areas of specific geologic units within the quadrangle using polygon attributes.
- Assess watershed assimilative capacity by integrating formation data with other environmental datasets.
Strengths
- Based on a published 1:250,000-scale geologic atlas from the Bureau of Economic Geology.
- Underwent formal USGS review for topological consistency and attribute accuracy.
- Projected to a standard Albers Equal Area projection on the NAD83 datum for spatial analysis.
Limitations
- Original source map data is from 1967, revised 1991, and may not reflect recent surface changes.
- Specific column names, attribute details, and sample size are not provided in the description.
- Spatial coverage is limited to a single quadrangle in Texas and Oklahoma.
Provenance
- Source
- Bureau of Economic Geology publication 'Geologic Atlas of Texas, Sherman sheet' (1967, revised 1991).
- Collection Method
- Digitized from the original paper geologic map, projected, and reviewed.
- Time Range
- Publication date of source material is 1967/1991.
- Freshness
- 1991-01-01
- Geography
- Sherman quadrangle in north-central Texas and southern Oklahoma.