Petrographic Study of Sandstone of the Inyan Kara Group (Cretaceous) and Associated Rocks in the Black Hills, Wyoming and South Dakota Page: 3
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Abstract .. . . . . . ... . . . .
Introduction ... .. . . . ..........
Grain size and sorting .. . . . .. . .
Composition .. . . . .. .. .. .
Proportions of constituents. .....
Pebbles in the Fuson-Lakota formations .
Nonopaque heavy minerals... . . . ...
Heavy mineral zones . . .
Source . . . . . . . . . . . . . .
Summary . . . . . . . .
Tabulation of data. . . .... . . . .
Literature cited .
. . . . . 8
. . . . . 16
. . . 37
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Index map showing sample localities, Black Hills .
2. Stratigraphic sections and size analyses of samples
from the Inyan Kara group and Morrison formation,
northern Black Hills.. . . . . . . .In
3. Stratigraphic sections and size analyses of samples
from the Inyan Kara group and the Morrison and
Unkpapa formations, southern Black Hills . .In
4. Diagrams showing average grain size distribution
(Column A) and sorting (Column B) in samples of
sandstone from the Fall River, Fuson-Lakota, Mor-
rison, and Unkpapa formations, Black Hills . .
5. Varieties of quartz grains in sandstone from the Inyan
Kara group and the Unkpapa and Morrison formations,
Black Hills . . . . . . . . . .
6. Sketches from thin sections showing the texture of
some pebbles from the Fuson-Lakota formations,
northern Black Hills .. . . ...... .
7. Diagrams showing the change in proportions of some
nonopaque heavy minerals in the very fine grained
sand fraction of samples having different average grain
sizes, Fall River, Fuson-Lakota, and Morrison for-
mations, Black Hills.. ...... .. . .
. . . .
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Bergenback, R. E.; Chisholm, W. A. & Mapel, W. J. Petrographic Study of Sandstone of the Inyan Kara Group (Cretaceous) and Associated Rocks in the Black Hills, Wyoming and South Dakota, report, July 1957; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc1050359/m1/4/: accessed June 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.