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RI0002D. Ouachita Facies in Central Texas - Downloadable PDF

RI0002D

RI0002D. Ouachita Facies in Central Texas, by V. E. Barnes. 12 p., 2 figs., 1948.  doi.org/10.23867/RI0002D. Downloadable PDF. To purchase this publication in book format, please order RI0002.

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RI0002D. Ouachita Facies in Central Texas, by V. E. Barnes. 12 p., 2 figs., 1948. doi.org/10.23867/RI0002D. Downloadable PDF.

To purchase this publication in book format, please order RI0002.


ABSTRACT
Steeply dipping shales and interbedded sandstones presumably of the Ouachita facies have been discovered along the Colorado River in Burnet and Travis counties, Texas. Previously the Ouachita facies was known in Texas only from bore-hole samples. The outcropping rocks are not metamorphosed, whereas many of the borehole samples described in the literature are metamorphosed. A re-examination shows that the bore-hole samples nearest the outcrop lack metamorphism, except for slight changes along slickensides, whereas away from the outcrop the rocks are progressively more metamorphosed, until in Caldwell County, the farthest point reached, the rocks are schist. Lithologies and grade of metamorphism suggest that the Caldwell County bore holes enter the Ouachita facies rather than rocks of pre-Cambrian age.

 

[Author’s Note: This paper was read at the annual meeting of the Geological Society of America, New York, N.Y., November 12, 1948; abstract published on p. 16 of official program.]


Keywords: Burnet County, Caldwell County, Central Texas, facies, Ouachita, Travis County, Texas


CONTENTS
Abstract

Introduction

Surface geology

Stratigraphy

Structure

Subsurface geology

Gravity data

Conclusions

References


Figures

1. Geologic map of Turkey Bend area, Burnet and Travis counties, Texas

2. Map showing variation in the degree of metamorphism of the Ouachita facies southeastward from its outcrop in central Texas


Citation
Barnes, V. E., 1928, Ouachita Facies in Central Texas: The University of Texas at Austin, Bureau of Economic Geology, Report of Investigations No. 2, 12 p. doi.org/10.23867/RI0002D.