Scientific Investigations Report 2007-5191
A high-resolution aeromagnetic survey was flown in 2001 over Medina and Uvalde Counties, Texas, as part of a multi-disciplinary investigation of the geohydrologic framework of the Edwards aquifer in south-central Texas. The objective of the survey was to assist in mapping structural features that influence aquifer recharge and ground-water flow. The survey revealed hundreds of magnetic anomalies associated with igneous rocks that had previously been unmapped. This report presents an interpretation of the outcrops and subcrops of igneous rocks, based upon procedures of matched-filtering and potential field modeling.
Posted April 2008
Smith, D.V., McDougal, R.R., Smith, B.D., and Blome, C.D., 2008, Distribution of igneous rocks in Medina and Uvalde Counties, Texas, as inferred from aeromagnetic data: U.S. Geological Survey Scientific Investigations Report 2007–5191, 12 p., one plate, scale 1:250,000.
Summary and Conclusions
Appendix. Georeferenced Igneous Rock Outlines in ESRI File Formats
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