Skip Links

USGS - science for a changing world

Scientific Investigations Report 2007-5191

Distribution of Igneous Rocks in Medina and Uvalde Counties, Texas, as Inferred from Aeromagnetic Data

David V. Smith, Robert R. McDougal, Bruce D. Smith, and Charles D. Blome

Thumbnail of and link to report PDF (34 MB)Download Publication
Scientific Investigations Report
2007-5191 PDF (34 MB)
Abstract

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.

Version 1.0

Posted April 2008


Suggested citation:

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.



Contents

Background

Geologic Setting

Data Processing

Interpretation

Summary and Conclusions

References Cited

Appendix. Georeferenced Igneous Rock Outlines in ESRI File Formats


Document Accessibility: Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Acrobat Reader or similar software is required to view it. Download the latest version of Acrobat Reader, free of charge or go to access.adobe.com for free tools that allow visually impaired users to read PDF files.

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/sir/2007/5191/index.html
Page Contact Information: Contact USGS
Page Last Modified: Thursday, December 01 2016, 08:01:43 PM