Reevaluating the Miocene Mollusk Systematics, Little Cove Point Member, St. Marys Formation, and Examining Their Paleoecology, Paleobiodiversity PDF Download
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Author: Heedar Bahman Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
The Little Cove Point Member belongs to the St. Marys Formation in Maryland, which is part of the Miocene Chesapeake Group. The objective of the research is to reevaluate the Miocene mollusk systematics, paleoecology, and paleobiodiversity of the Little Cove Point Member. Two sets of mollusk fossils were provided by the Calvert Marine Museum that represent bulk, samples of studied materiel taken from one l cubic meter area, and grab samples, samples of studied material taken from one or more small area. One set of data was obtained from the Chesapeake Bay Benthic Monitoring Program that include Holocene Mollusca fauna of the bay. The bulk sample includes 35 genera, the grab sample include 20 genera while the modern sample have 21 described genera. Four species were recorded for the first time in the Little Cove Point Member in this collection, Chesapecten santamaria, Chesacardium laqueatum laqueatum, Lirophora parkeria, and Spisula subcuneata. The paleobiodiversity was measured using the Shannon index (H). Then richness, the number of different species represented in an ecological community and evenness (E), the measure of the relative abundances of species within a community, of the species was calculated. The similarity between the community of mollusks was tested using Sorensen's coefficient. The bulk sample has higher biodiversity index than the extant fauna, while the grab sample has a lower biodiversity than the bulk sample. Bulk sampling provides a better representation of biodiversity measurements than a grab sample.
Author: Heedar Bahman Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
The Little Cove Point Member belongs to the St. Marys Formation in Maryland, which is part of the Miocene Chesapeake Group. The objective of the research is to reevaluate the Miocene mollusk systematics, paleoecology, and paleobiodiversity of the Little Cove Point Member. Two sets of mollusk fossils were provided by the Calvert Marine Museum that represent bulk, samples of studied materiel taken from one l cubic meter area, and grab samples, samples of studied material taken from one or more small area. One set of data was obtained from the Chesapeake Bay Benthic Monitoring Program that include Holocene Mollusca fauna of the bay. The bulk sample includes 35 genera, the grab sample include 20 genera while the modern sample have 21 described genera. Four species were recorded for the first time in the Little Cove Point Member in this collection, Chesapecten santamaria, Chesacardium laqueatum laqueatum, Lirophora parkeria, and Spisula subcuneata. The paleobiodiversity was measured using the Shannon index (H). Then richness, the number of different species represented in an ecological community and evenness (E), the measure of the relative abundances of species within a community, of the species was calculated. The similarity between the community of mollusks was tested using Sorensen's coefficient. The bulk sample has higher biodiversity index than the extant fauna, while the grab sample has a lower biodiversity than the bulk sample. Bulk sampling provides a better representation of biodiversity measurements than a grab sample.
Author: Heedar Bahman Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
A collection of decapod fossils from the Miocene St. Marys Formation, Little Cove Point Member, was examined. Three different genera were recognized, Necronectes A. Milne Edwards, 1881, Callinectes Stimpson, 1860, and Cancer Linnaeus, 1758, comprising 6 species. Cancer included 4 species, Cancer irroratus Say, 1817; Cancer borealis Stimpson, 1859; and two new species. Necronectes is represented by Necronectes drydeni Rathbun, 1935. Callinectes was also represented by a single species within the collection, Callinectes sapidus Rathbun, 1896. Most of the fossils were small relative to normal adult size. The paleoecology was similar to the present day ecology based on study of recent faunas, lithology, and paleoecology. The paleo-environment was shallow marine within the temperate climate zone.
Author: Edward J. Petuch Publisher: CRC Press ISBN: 1439811601 Category : Nature Languages : en Pages : 180
Book Description
The Chesapeake Miocene will always be considered a paleontological treasure. Given the richness and accessibility of the Maryland and Virginia Miocene shell beds, it seems remarkable that very few people have ever described new species from these strata over the past 185 years. Until now. Integrating elements from paleontology, geology, environmental science, and ecology, Molluscan Paleontology of the Chesapeake Miocene assembles previous research and the authors’ experience into a synoptic field guide. The most complete compendium of Miocene species created since 1904, this long-awaited resource lists nearly 500 species. It contains illustrations of 260 species, including more than 60 not found in any previous book and 26 newly discovered. It describes Chesapeake molluscan faunas in terms of local geology, paleoceanography, and marine paleobiology. Organized by stratigraphic geology, the book covers fossils of the Eastover, St Mary’s, Choptank, and Calvert Formations. It illustrates 24 collecting sites and fossil exposures, showing details of in situ specimens, along with maps of 4 Miocene paleoseas and detailed stratigraphic columns for Maryland and northern Virginia. The text is accompanied by downloadable resources with color illustrations of the forty known species of ecphora shells. Armed with these, you should be able to identify the species found in the amazingly rich shell beds of the Chesapeake Bay area.
Author: Heedar Bahman
Author: Heedar Bahman
Author: Heedar Bahman
Author: Edward J. Petuch
Author: Lauck W. Ward
Author: Robert Parr Whitfield
Author: Leonidas Chalmers Glenn
Author: Wendell Phillips Woodring
Author: Maryland Geological Survey
Author: Wendell Phillips Woodring
Author: Wendell Phillips Woodring