Title page for ETD etd-07072010-020304

Type of Document Master's Thesis
Author Benson, Don Gehr
URN etd-07072010-020304
Title Dinoflagellate biostratigraphy of the Cretaceous-Tertiary boundary, Round Bay, Maryland.
Degree Master of Science
Department Geological Sciences
Advisory Committee
Advisor Name Title
McLean, Dewey M. Committee Chair
Bambach, Richard K. Committee Member
Tillman, C. G. Committee Member
  • Cretaceous sediments
  • dinoflagellate assemblage
  • Paleocene sediments
Date of Defense 1975-08-03
Availability restricted
The Monmouth and Brightseat Formations contain a rich and diverse dinoflagellate assemblage. Thirty-five genera and sixty-six species, of which two genera and eight species are new, are described in this study. The stratigraphic distribution of the taxa is summarized in Figure 4. The content of the assemblage changes suddenly at the Cretaceous-Tertiary boundary with thirteen species making the~r first appearance at or just above the boundary. Nineteen species cross the boundary and thirty-five species are restricted to the Cretaceous. The rather sudden change in the nature of the dinoflagellate assemblage at the boundary is interpreted by the author to indicate a paraconformable relationship between the Cretaceous and Paleocene sediments. The term paraconformity is used since there is little field evidence (a few pebbles, some lignite, and evidence of boring) indicating any extensive period of erosion at the boundary.
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