The Spence Shale and Its Fauna, (with Six Plates)
Author: Charles Elmer Resser
Publisher:
Published: 1939
Total Pages: 46
ISBN-13:
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Stratigraphic Paleobiology
Author: Mark E. Patzkowsky
Publisher: University of Chicago Press
Published: 2012-04-16
Total Pages: 274
ISBN-13: 0226649377
DOWNLOAD EBOOKThis work weaves important strands of the paleontological literature into a coherent worldview that emphasizes the importance of understanding the geological record.
Echinoderm Paleobiology
Author: William I. Ausich
Publisher: Indiana University Press
Published: 2008-07-18
Total Pages: 474
ISBN-13: 0253351286
DOWNLOAD EBOOKThe dominant faunal elements in shallow Paleozoic oceans, echinoderms are important to understanding these marine ecosystems. Echinoderms (which include such animals as sea stars, crinoids or sea lilies, sea urchins, sand dollars, and sea cucumbers) have left a rich and, for science, extremely useful fossil record. For various reasons, they provide the ideal source for answers to the questions that will help us develop a more complete understanding of global environmental and biodiversity changes. This volume highlights the modern study of fossil echinoderms and is organized into five parts: echinoderm paleoecology, functional morphology, and paleoecology; evolutionary paleoecology; morphology for refined phylogenetic studies; innovative applications of data encoded in echinoderms; and information on new crinoid data sets.
Fossils and the Future
Author: Richard H. Lane
Publisher:
Published: 2000
Total Pages: 308
ISBN-13:
DOWNLOAD EBOOKThe Las Vegas Formation
Author: Kathleen B. Springer
Publisher:
Published: 2018
Total Pages:
ISBN-13: 9781411342378
DOWNLOAD EBOOK"The Las Vegas Formation was established in 1965 to designate the distinctive light-colored, fine-grained, fossil-bearing sedimentary deposits exposed in and around the Las Vegas Valley, Nevada. In a coeval designation, the sediments were subdivided into informal units with stratigraphic and chronologic frameworks that have persisted in the literature. Use of the Las Vegas Formation name over the past half century has been hampered because of the lack of a robust definition and characterization of the entire lithostratigraphic sequence and its geographic distribution and chronology. This study evaluates and describes deposits attributed to the Las Vegas Formation with detailed stratigraphy, sedimentology, and field relations"--Provided by publisher.
Lower Cambrian Trilobites from the Illtyd Formation, Wernecke Mountains, Yukon Territory
Author: William Harold Fritz
Publisher: Geological Survey of Canada
Published: 1991
Total Pages: 86
ISBN-13:
DOWNLOAD EBOOKThis study focuses on a stratigraphic section in the Wernecke Mountains that represents peak transgression at the end of the Early Cambrian and thus peak availability of data. The section has a great thickness of upper Bonnia-Olenellus Zone strata containing numerous trilobite-bearing beds. The trilobites described in this study are from a 946 m thick stratigraphic section in the Lower Cambrian Illtyd Formation. Trilobites belonging to 14 genera (2 new) and 38 species (15 new) are described and a medial Bonnia-Olenellus Zone age near the base of the Illtyd Formation is documented.
Ecological Consequences of Climate Change
Author: Erik A. Beever
Publisher: CRC Press
Published: 2016-04-19
Total Pages: 320
ISBN-13: 1420087223
DOWNLOAD EBOOKContemporary climate change is a crucial management challenge for wildlife scientists, conservation biologists, and ecologists of the 21st century. Climate fingerprints are being detected and documented in the responses of hundreds of wildlife species and numerous ecosystems around the world. To mitigate and accommodate the influences of climate ch
Ontogeny, Intraspecific Variation, and Systematics of the Late Cambrian Trilobite Dikelocephalus
Author: Nigel C. Hughes
Publisher:
Published: 1994
Total Pages: 728
ISBN-13:
DOWNLOAD EBOOKBiometric 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.
An Unusual Lower Cambrian Trilobite Fauna from Nevada
Author: Allison R. Palmer
Publisher:
Published: 1964
Total Pages: 13
ISBN-13:
DOWNLOAD EBOOKTrilobites from the Lower Champlainian Formations of the Appalachian Valley
Author: Byron Nelson Cooper
Publisher: Geological Society of America
Published: 1953
Total Pages: 98
ISBN-13: 0813710553
DOWNLOAD EBOOKForty-five species of lower Middle Ordovician trilobites, including six new genera and thirty new species, are described and illustrated from the extensive collections in the United States National Museum. Most of these species occur in beds whose age and correlation have been a matter of controversy for more than a decade. The stratigraphic evidence afforded by the trilobites lends strong support to regional stratigraphic interpretations of the lower Champlainian beds in the Appalachian Valley, which have been worked out by G. Arthur Cooper and the writer fromdetailed study of brachiopod faunas and from physical stratigraphic studies. The trilobites, like brachiopods, are not so restricted in their facies distribution as are many groups of invertebrate fossils. Hence they are very useful in establishing contemporaneity of dissimilar facies. In this paper only the more common trilobites are described. The principal purpose of this study is to make available for biostratigraphic use a number of trilobite species, most of which have been confused or misidentified previously.
