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
Keywords	Cretaceous sediments dinoflagellate assemblage Paleocene sediments
Date of Defense	1975-08-03
Availability	restricted
Abstract 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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