Comparative petrography of intra- and extra-macrofossil sediment within Pleistocene to Cretaceous strata of the North Carolina coastal plain / by Charlotte M. Varlashkin.
| Author/creator | Varlashkin, Charlotte M. author. |
| Other author | Otte, Lee J., degree supervisor. |
| Other author | East Carolina University. Department of Geology. |
| Format | Theses and dissertations |
| Production | 1986. |
| Description | 105 leaves : illustrations, maps ; 28 cm |
| Supplemental Content | Access via ScholarShip |
| Subjects |
| Summary | Macrofossils can protect the enclosed sediment from certain diagenetic agents. The protected intra-macrofossil sediment can then be a useful device for interpreting primary sediment character if the shell has had sufficient closure. The frequency of variation in sediment character between intra- and extra-macrofossil deposits, if not caused by depositional processes, is a measure of diagenetic barrier capability of the shell. Twenty-six percent of the samples in this study are effective diagenetic barriers. Brachiopods, bivalves, and gastropods appear to be the most efficient barriers. Carbonate rock type and finegrain size also increase the frequency of variation between intra- and extra-macrofossil sediment character. The samples in this study are Pleistocene to Cretaceous in age. The frequency of variation between intra- and extra-macrofossil sediment character increases with age. Usefulness of intra-macrofossil deposits therefore increases with age. The youthfulness of samples in this study provided less opportunity for diagenetic change and therefore less opportunity to produce a variation between intra- and extra-macrofossil sediment character. Older deposits would likely have a greater percentage of variations. The processes which produced the most frequent diagenetic variations in this study include compaction, calcite spar precipitation, dissolution, aggradation of lime mud grain size, glauconitization, pyritization, and dolomitization. |
| General note | "Presented to the faculty of the Department of Geology ... in partial fulfillment of the requirements for the degree Master of Science in Geology." |
| General note | Advisor: Lee J. Otte |
| Dissertation note | M.S. East Carolina University 1986 |
| Bibliography note | Includes bibliographical references (leaves 78-81). |
| Genre/form | dissertations. |
| Genre/form | Academic theses. |
| Genre/form | Academic theses. |
| Genre/form | Thèses et écrits académiques. |
Availability
| Library | Location | Call Number | Status | Item Actions |
|---|---|---|---|---|
| Joyner | University Archives | ASK AT SPECIAL COLLECTIONS DESK | ✔ Available | Request Material |
| Joyner | NC Microforms | MICROFILM | ✔ Available | |
| Electronic Resources | Access Content Online | ✔ Available |