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Showing 1 to 20 of 33 for “"Brachiopods"”.
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Derivation of principal strains from deformed brachiopods
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1959.
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Diagenesis and geochemical stratigraphy of Upper Pennsylvanian madera brachiopods, New Mexico
… were analyzed. Of which, about 86% of the Madera brachiopods are preserved in their pristine mineralogy, microstructure and geochemistry. Cement and matrix samples, in contrast, have been subjected to complete but variable post-deposition~1 alteration. It is confirmed that the stable isotope data …
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Ecological, Evolutionary, and Taphonomic Comparisons of Brachiopods and Bivalves at Multiple Spatial and Temporal Scales
… quantification of a worker bias in monographs of brachiopods and bivalves. Most specimens studied came from the 65th to 69th percentile of their species' bulk-collected size-frequency distribution. This indicates a significant bias toward monograph specimens that are larger than the mean size of …
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Middle Cambrian linguliformean brachiopods of the Pika and Sullivan formations, southern Canadian Rocky Mountains, Alberta, Canada
Linguliformean brachiopods were collected and described from the middle Cambrian Pika and Sullivan formations in the southern Canadian Rocky Mountains. These formations consist of coarse-grained grainstone interbedded with lime mudstones and siltstones in a storm-influenced, distal offshore …
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The record of carbon, oxygen, sulfur, and strontium isotopes and trace elements in late Paleozoic brachiopods
Embargo set by: Seth Robbins for item 104109 Lift date: 2019-11-30T21:03:43Z Reason: Electronic Theses and Dissertation
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Traces of Predation/Parasitism Recorded in Eocene Brachiopods from the Castle Hayne Limestone, North Carolina, U.S.A.
… fossils, was sampled to assess if early Cenozoic brachiopods from eastern North America record any traces of biotic interactions. Systematic surveys of two North Carolina quarries yielded 494 brachiopods, dominated by one species: Plicatoria wilmingtonensis (Lyell and Sowerby, 1845). Despite …
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Ocean warming, acidification, and chemistry of the South Pacific & North Atlantic: a brachiopod investigation
… ocean data is limited, so natural archives like brachiopods are used to understand past oceanic conditions. Brachiopod shells record seawater temperatures, chemistry, and acidity. This thesis uses brachiopods from Paterson Inlet, New Zealand (1900–2021), and the Bay of Fundy, Canada (1970–2009) …
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Petrography, Sedimentology, Diagenesis, and Reservoir Characteristics of Some Pennsylvanian Phylloid Algal Limestones: Kansas and Utah, u.s.a. (United States)
… foraminifers, fusulinids, Composita, productid brachiopods, and pelmatozoans.
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Ordovician paleoceanography: Stable isotope and carbon-sulfur-iron evidence from the Caradocian Trenton Group, Mohawk Valley, New York
… isotope evidence from Caradocian Trenton Group brachiopods in the Mohawk Valley of New York suggests that Caradocian oceans were salinity-stratified and dominated at depth by warm, saline waters. $\delta\sp{18}$O values of these brachiopods, which lived on the eastern continental slope of the …
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Spatial variability in modern brachiopod assemblages: paleoecological and geochemical implications
… of encrustation patterns on naturally occurring brachiopods and bivalves collected from the same sites, and occupying the same size range, demonstrates that the results of encrustation studies on modern bivalves cannot be directly applied to ancient brachiopods. However, careful comparisons may …
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Quantitative Estimates of Time-Averaging in Brachiopod Shell Accumulations from a Holocene Tropical Shelf (SW Brazil)
… quantitative estimates of time-averaging for brachiopods, extending our understanding of intrinsic, or group specific controls on this process. Estimates were obtained by direct dating of individual terebratulid brachiopod shells Bouchardia rosea (Mawe) collected from modern surficial shelly …
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MISSISSIPPIAN MUD MOUNDS OF DERBYSHIRE (ENGLAND, UK): FACIES ARCHITECTURE AND BIOTIC EVOLUTION
… In particular, the distribution and role of brachiopods in Mississippian mud mounds are scarcely constrained, despite brachiopods are among the most common marine benthic invertebrates in the Mississippian. The brachiopod-rich mud mounds occurring in the uppermost Monsal Dale Limestone …
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Geology of the Flathead Formation (Middle Cambrian) on the perimeter of the Bighorn Basin, Beartooth Mountains, and Little Belt Mountains in Wyoming and Montana
… upwards in their dwelling tubes. Inarticulate brachiopods are present in the upper interval in some places. The brachiopods, which are the first to be identified in the formation belong to three genera. </p><p> Comparison of the characteristics of the Flathead Formation with modern …
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Macrofossils and biostratigraphy of the Bakken Formation (Devonian and Mississippian) in western North Dakota
… 50 taxa were collected from cores of 40 wells. Brachiopods, the most common fossil, represent 17 genera, 1 of which have not been previously reported from the Bakken. Nonbrachiopod fossils of this study, mostly not previously reported from the Bakken, are a hylothyrid, a conulariid, a …
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Investigating Predation in the Fossil Record: Modern Analogs
… and cryptic or antitropical distribution of brachiopods is often explained as due to the potentially low energetic value and suspected non-palatability or toxicity of brachiopod tissues. Here we demonstrate that multiple invertebrate marine predators (crustaceans, echinoderms, and gastropods) …
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The paleoecology of the Keyser limestone: a re-evaluation
… in studying the Keyser Limestone, concluded that brachiopods were distributed randomly, casting doubt over the validity of using recurrent communities as a paleoenvironmental tool. However, a re-evaluation of the Keyser fauna, utilizing cluster analysis, polar ordination, and detrended …
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Sequence Stratigraphy and Paleoecology of the Late Mississippian Little Stone Gap Member in the Appalachians of West Virginia
… preferentially occur in carbonate facies whereas brachiopods, the most dominant taxon, are abundant in both. Results suggest the presence of significant paleoenvironmental gradients in fossil associations that correlates to changes in hydrodynamic conditions and substrate composition across the …
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BIOMINERALIZATION AND GLOBAL CHANGE: BIOTIC RESPONSE TO THE GONDWANAN GLACIATION AND SUBSEQUENT CLIMATE WARMING
… analyses. The microstructural analyses of these brachiopods showed that, as expected, the primary layer is very rarely or never preserved in the fossil material. The sec-ondary layer preservation is not correlated to the type of fabric, but the presence of tertiary layer was observed more …
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