Systematics And Biostratigraphy Of Dunderbergia And Related Trilobites From Cambrian Mid Steptoean Strata Of Nevada Utah Texas And Newfoundland
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Author | : Robert Mayer |
Publisher | : |
Total Pages | : 184 |
Release | : 2022 |
Genre | : Geology |
ISBN | : |
Download Systematics and Biostratigraphy of Dunderbergia and Related Trilobites from Cambrian (mid-Steptoean) Strata of Nevada, Utah, Texas, and Newfoundland Book in PDF, Epub and Kindle
Author | : Graham Arthur.* Young |
Publisher | : |
Total Pages | : 378 |
Release | : 1984 |
Genre | : |
ISBN | : |
Download Systematics and Biostratigraphy of Middle Cambrian Trilobites from the Cow Head Group, Western Newfoundland Book in PDF, Epub and Kindle
Author | : Lisa Lynn Bohach |
Publisher | : |
Total Pages | : 984 |
Release | : 1997 |
Genre | : Geology, Stratigraphic |
ISBN | : |
Download Systematics and Biostratigraphy of Lower Cambrian Trilobites of Western Laurentia Book in PDF, Epub and Kindle
Author | : Donna Lynn Hunt |
Publisher | : |
Total Pages | : 310 |
Release | : 1990 |
Genre | : |
ISBN | : |
Download Trilobite Faunas and Biostratigraphy of the Lower Cambrian Wood Canyon Formation, Death Valley Region, California Book in PDF, Epub and Kindle
Author | : Jad Ryan Bean |
Publisher | : |
Total Pages | : 304 |
Release | : 2002 |
Genre | : |
ISBN | : |
Download Trilobite Paleoecology and Biostratigraphy of the Upper Cambrian (Steptoean) Dunderberg Formation, Cherry Creek Range and Schell Creek Range, Nevada Book in PDF, Epub and Kindle
Author | : Nigel C. Hughes |
Publisher | : |
Total Pages | : 728 |
Release | : 1994 |
Genre | : Science |
ISBN | : |
Download Ontogeny, Intraspecific Variation, and Systematics of the Late Cambrian Trilobite Dikelocephalus Book in PDF, Epub and Kindle
Biometric analyses of well-localized specimens of the trilobite Dikelocephalus from the St. Lawrence Formation (Upper Cambrian), northern Mississippi Valley, suggest that all specimens belong to a single, highly variable morphospecies, D. minnesotensis. A complex pattern of ontogenetically-related and ontogeny-independent variation produced a mosaic of morphotypes, which show greater diversity than previously recorded within trilobite species. There is considerable variation within collections made from single beds. Variations of characters among collections are mosaic, and are clinal in some cases. Patterns of variation within Dikelocephalus cannot be related to lithofacies occurrence. There are no obvious temporal variations in D. minnesotensis within the St. Lawrence Formation, but some Dikelocephalus from the underlying Tunnel City Group may belong to a different taxon. The validity of this early taxon is questionable due to a lack of available material. The mosaic pattern of variation in Dikelocephalus mimics that documented at higher taxonomic levels in primitive libristomate trilobites, and helps explain difficulties in providing a workable taxonomy of primitive trilobites. Results caution proposition of evolutionary scenarios that do not take account of intraspecific variation. The recovery of dorsal shields of Dikelocephalus permits the first detailed reconstruction of the entire exoskeleton. The systematics of the genus is revised and twenty-five species are suppressed as junior synonyms of D. minnesotensis.
Author | : William Thornton Dean |
Publisher | : Hull : Supply and Services Canada |
Total Pages | : 10 |
Release | : 1978 |
Genre | : Geology |
ISBN | : 9780660015118 |
Download Preliminary Account of the Trilobite Biostratigraphy of the Survey Peak and Outram Formations (late Cambrian, Early Ordovician) at Wilcox Pass, Southern Canadian Rocky Mountains, Alberta Book in PDF, Epub and Kindle
Author | : Charles Doolittle Walcott |
Publisher | : |
Total Pages | : 770 |
Release | : 1916 |
Genre | : Geology, Stratigraphic |
ISBN | : |
Download Cambrian Geology and Paleontology ...: Cambrian and Ozarkian trilobites. 1925. (Pub. 2823) Book in PDF, Epub and Kindle
Author | : Graham A. Young |
Publisher | : Geological Survey of Canada |
Total Pages | : 60 |
Release | : 1989 |
Genre | : Nature |
ISBN | : |
Download Mid-Cambrian Trilobites from the Lowest Part of the Cow Head Group, Western Newfoundland Book in PDF, Epub and Kindle
Rich mid-Cambrian trilobite faunas were recovered from limestone boulders in conglomerates that form the lowest exposures of the Cow Head Group (Shallow Bay Formation) near Broom Point in western Newfoundland. These boulders were derived from various shelf-edge and upper slope environments along the margin of Laurentia. Twenty-nine species representing twenty genera are described. Three trilobite biofacies are defined based on the abundance of the genera in separate boulders."
Author | : Katie Foster Welch |
Publisher | : |
Total Pages | : 176 |
Release | : 2020 |
Genre | : Paleontology |
ISBN | : |
Download Cambrian Trilobites from the Steptoean-Sunwaptan Boundary Interval (Jiangshanian), Nevada and Utah Book in PDF, Epub and Kindle