Austin Chalk - Wikipedia
The Austin Chalk is an upper Cretaceous geologic formation in the Gulf Coast region of the United States. It is named after type section outcrops near Austin, Texas . The formation is made up of chalk and marl .
Lance's north Texas fossil page - Austin Chalk
black prairie region - typical austin chalk From eastern Grayson County southwards, the Austin is in general typical. It forms a wide, prominent and important outcrop, the substratum of a part of the fertile black land belt (Black Prairie) devoted largely to cotton raising.
In this study, detailed sequence stratigraphic correlations of the Austin Chalk indicate the presence of five depositional sequences. Isochore maps of these sequences show the sequential westward movement of the axis of the San Marcos Arch during Austin Chalk deposition.
An integrated outcrop and subsurface study of the Upper Cretaceous Austin Chalk Group across the San Marcos Arch was conducted to understand the influence of re-gional paleotopography on facies and sequence architecture.
Fracture Development and Mechanical Stratigraphy of Austin Chalk ...
The mechanical stratigraphy of the Upper Cretaceous Austin Chalk is established from study of fracture intensity along its outcrop trend from Dallas to San Antonio and westward to Langtry, Texas, and in the subsurface from study of cores and/or fracture identification logs from 30 wells.
Chemostratigraphic and Sequence Stratigraphic Analysis of the Austin …
The carbonate-rich Lower Austin Formation is the primary unconventional reservoir target of the Fractured Austin Chalk play across Texas. A detailed study of this lower unit was conducted in outcrop exposures along U.S. Highway 90 in Val Verde County, Texas.
Heterogeneous Geomechanical Properties Within the Austin Chalk ...
2023年6月23日 · The importance of layered, variable-strength rocks to natural fracture development is observed in an outcrop exposure of the Austin Chalk in central Texas.
Tectonic and eustatic impact on depositional features in the …
2020年5月15日 · The integration of outcrop and subsurface well log data clarifies the regional correlation of the Austin Chalk Group in south-central Texas; combined with sedimentologic data from outcrops, this approach permits establishment of a sequence stratigraphic model that highlights facies and architectural variability due to syndepositional tectonic ...
Micropetrographic characterization of a siliciclastic-rich chalk; …
2021年2月1日 · Through micropetrographic analysis, we determined Austin Chalk composition to be mainly a matrix of coccoliths and coccolith elements in 20- to 30-micron peloids (probably marine snow). The most common larger components are planktic foraminifers and bottom-dwelling inoceramids.
Mechanical stratigraphy and fault zone deformation of the Austin chalk ...
The Austin Chalk is a rhythmically bedded sequence of chalk and marl that represents carbonate deposition in the ancestral Gulf of Mexico during the Upper Cretaceous. The Austin Chalk differs from other chalk deposits due to its relatively high abundance of clay and volcanic ash.
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