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J Bret Bennington geojbb@hofstra

Biostratigraphic and Lithostratigraphic Correlation of Sedimentary Strata in the Atlantic Coastal Plain. J Bret Bennington geojbb@hofstra.edu. Learning Objectives. Correlation (lithostrat. and chronostrat.) Utility of fossils for dating strata Fossils as chronostratigraphic markers

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J Bret Bennington geojbb@hofstra

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  1. Biostratigraphic and Lithostratigraphic Correlation of Sedimentary Strata in the Atlantic Coastal Plain J Bret Bennington geojbb@hofstra.edu

  2. Learning Objectives • Correlation (lithostrat. and chronostrat.) • Utility of fossils for dating strata • Fossils as chronostratigraphic markers • Transgressions and regressions • Unconformities - angular, disconformity • Subsidence rates • Group problem solving / teamwork • Discussion: sea level changes, changes in deposition, practical applications of stratigraphy, time trangressive nature of strata, subsidence of the continental margin

  3. 1. Assign ages to strata based on foraminifera index fossils.

  4. 2. Locate unconformity surfaces based on: a. biostratigraphic evidence (missing index fossils / time interval). b. lithologic evidence (paleosols).

  5. 3. Correlate unconformity surfaces that cut out the same time intervals. (Question for discussion: Why do unconformities merge landward and disappear seaward?)

  6. 4. Correlate invertebrate index fossils. (Question for discussion: Why are fossils useful for identifying unique time intervals?)

  7. 5. Draw in lithostratigraphic correlations. Discuss rules for making correlations, pinching of sands landward and muds seaward, “dead ending” of correlations into unconformities.

  8. 6. Color lithologies to complete the fence diagram.

  9. 6. Color lithologies to complete the fence diagram. Identify disconformities and angular unconformities.

  10. Downward flexure of the continental margin 85 my >90 my 135 my Subsidence Rates 140 my 150 my

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