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Showing 1 to 7 of 7 for “"Sponge spicules"”.
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Sequence Stratigraphy of Middle-Mississippian Carbonates of the Southern Appalachians: Tuscumbia Limestone, Tuscumbia, AL
… mud facies (F3) with echinoderms (0-37%), sponge spicules (3-30%), silt grains (0- 25%), and solenoporoid algae (< 1%) between 0.25-4.75 meters in thickness was described. In outcrop, F3 exhibits mound-shaped geometry. Based on these observations, the F3 exposures of the Tuscumbia Limestone …
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A Petrologic and Diagenetic Study of the Onondaga Formation, New Jersey
… of silica for chert nodule growth consisted of sponge spicules, dissolution of terrigenous sediment, influx of silica rich fluids from meteoric waters, and minor volcanic ash dissolution. These sediments were formed close to their source of origin during the incipient Acadian Orogeny. The small …
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High Resolution Paleothermometry Using Biogenic Silica: A Feasibility Study
… as well as marine and freshwater diatoms and sponges (Simpson and Volcani, 1981). It is therefore not uncommon for biogenic silica to be found in environments subject to wildfires. Experimental work on plant-derived opaline phytoliths by Elbaum et al. suggests that the refractive indices …
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Foraminifera from outcrops of the Pierre Shale (Upper Cretaceous) of North Dakota
… to the writer, include Foraminifera, Radiolaria, sponge spicules and Ostracoda. It was hoped that a study of the Foraminifera would provide a basis and illustrate the affinity to the Pierre of calcareous, buff colored strata that crop out in the valley of the Sheyenne River, from North Valley …
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SILICON ISOTOPE AND PETROGRAPHIC INVESTIGATIONS OF SILICIFIED CARBONATE ROCKS: IMPLICATIONS FOR IMPROVED PARAGENETIC SEQUENCING AND PROXIES FOR PALEOZOIC OCEAN CHEMISTRY
… is proposed to the fractionation factor of sponge spicules used in the model. The correction is based on a Michaelis–Menten enzyme kinetics model and estimates ancient sponge fractionation factor values of -4.68 ‰. Using this correction, the dissolved Si was estimated at +1.99 ‰ to +2.28 ‰ …
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Micropalaeontology, Palaeoenvironments and Sequence Stratigraphy of the Sulaiy Formation of Eastern Saudi Arabia
… calcareous algae, calcispheres, stromatoporoids, sponge spicules, problematica (e.g. Lithocodium aggregatum), molluscs, corals, echinoderms and ostracods. Systematics of planktic and benthic foraminifera is accomplished using the foraminiferal classification by Loeblich and Tappan (1988) as the …
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Tephrostratigraphy, petrography, geochemistry, age and fossil record of the Ganigobis Shale Member and associated glaciomarine deposits of the Dwyka Group, Late Carboniferous, southern Africa
… bivalves, gastropods, scyphozoa, crinoid stalks, sponges and sponge spicules, radiolaria, coprolites and permineralised wood. These mostly marine body and trace fossils record the extent of the first of a series of marine incursions into the disintegrating Gondwanan interior as early as the …