Sediment diagenesis, fossil preservation, and depositional environment in the Stone City/Lower Cook Mountain transgression (Middle Eocene, southeast Texas) : a test of chemical taphofacies in the rock record /
a great need to test the taphofacies concept on the rock
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1994.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | a great need to test the taphofacies concept on the rock bivalves) control shell preservation. Shells preserved well City/Cook Mountain formations, middle Eocene, in Southeast clay consistently possessed poorly preserved shells. Units cohorts in other environments, underlining the importance of composition and microstructure underwent differential Composition and microstructurewere not tested because composition, and total carbonate content were not linearly containing both pyrite and green clay possessed the best control shell dissolution were tested. Life position/habit controlled by geochemical conditions in the sediment, the controlling shell preservation are not well known. correlate with preservation, nor does valve type (for correlated with preservation. However, fossils did show depositional bias present in the fossil assemblage. Because depositional environment, sediment geochemistry, and post- depositional environment. Pyrite content, sediment diagenetic mineral formation and fossil preservation are diagenetic minerals present may be useful indices of sediment differential preservation within lithologic type for all during life. Shells of closely related taxa with the same environments when taphonomic condition was compared to any framboidal pyrite and green marine clay, as well as sediment geochemistry and the preservational condition of fossils. important because it provides information about the in one environment frequently fared much worse than their Most taphonomic studies are of modern sediments, and there is observations on concretions. Several factors thought to other variable. Brown shales containing pyrite but no green preservation. preservation. Additional information was obtained through record. The taphofacies concept has been tested in the Stone several depositional environments. Two diagenetic minerals, shales, green shales, and quartose event units, representing shell preservation regardless of pyrite content, indicating taphonomic preservation, indicating that all the factors Texas. The strata consist of brown shales, pelleted green texture and composition were compared to mollusk that iron cycling may buffer pH and lead to good The recognition of taphonomic loss in the fossil record is the use of organic carbon data, carbon/sulfur ratios, and they did not vary in the taxa analyzed. Shell size does not three variables. Data clustered within depositional was found to be of some importance in dissolution acquired |
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| Item Description: | "Major subject: Geology". Includes one computer disk: 3.5" high density IBM format." Vita. |
| Physical Description: | xiv, 189 leaves : illustrations, map ; 28 cm. + 1 computer disk Also available online. |
| Bibliography: | Includes bibliographical references. |