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| Scientific Investigations Report 2004–5226 |

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## Three-Dimensional Geologic Framework Modeling of Faulted Hydrostratigraphic Units  within the Edwards Aquifer, Northern Bexar County, Texas

#### By Michael P. Pantea and James C. Cole

| This report includes a digital, three-dimensional (3-D) faulted hydrostratigraphic        model we have constructed to represent the geologic framework of the        Edwards aquifer system in the area of San Antonio, northern Bexar County,        Texas. The model is based on mapped geologic relationships that reflect        the complex structures of the Balcones fault zone, detailed lithologic        descriptions and interpretations of about 40 principal wells (and qualified        data from numerous other wells), and a conceptual model of the gross        geometry of the Edwards Group units derived from prior interpretations        of depositional environments and paleogeography.

The EarthVision 3-D software included in this publication is provided for use        on four platforms: Windows 2000/XP, SGI, SUN, and Linux. Please see the        Readme1.txt file for information about starting and using the software        on each platform. The 3-D model and viewer software can be downloaded        from this Web site, and they are also available on the CD-ROM version        of this report, which is available as a sales item from Information Services,        U.S. Geological Survey (1-888-ASK-USGS). 

Earth Vision software is the intellectual property of Dynamic Graphics, Inc.,        and is used here with their permission. Other than those rights granted        to the USGS and third parties to assist them in using this product (any        venue), Dynamic Graphics, Inc., reserves all rights in their software.        Any appearances of trade, product, or firm names, or private logos, in        or on this product do not, and are not intended to, imply endorsement        by the U.S. Government.

**Version 1.0**
Posted April 2004
Part or all of this report is presented in Portable Document Format. The latest              version of Adobe Acrobat Reader or similar software is required              to view it. If you wish to download the latest version of Acrobat              Reader free of charge, click here. |
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| - **Report** PDF file (1.16 MB) | **For viewing and printing.** |
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| Text-only version | *(This PDF version of the report is accessible as defined in Section 508)* |
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| **Readme** | TXT file |
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| **Metadata** | TXT file |
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| - **Downloads** Directory | Includes 3-D model data, Earth Vision viewer software, and software help files |
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| U.S. Department of the Interior | U.S. Geological Survey      URL: https://pubsdata.usgs.gov/pubs/sir/2004/5226/Questions or Assistance: USGS Web ContactPage Last Modified: Thr Dec  1 20:06 EDT 2016 |  |

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