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Showing 1 to 6 of 6 for “"spicule"”.
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The biology and taxonomy of Mesozoic stromatoporoids
The presence of spicule pseudomorphs and an aquiferous filtration system in Mesozoic stromatoporoids confirms poriferan affinity for this previously problematic group. The form, and postulated original siliceous nature of most of the spicules, indicates that the possessors of these were calcified …
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Petrography and paragenesis of diagenetic mineral phases in cherty and dolomitic spiculite strata, Mississippian, South-central Kansas
… history in variable cherty and dolomitic sponge-spicule-rich facies. The cores described comprises a series of lithofacies that are representative of inner-, mid and outer-ramp depositional environments, and depict conditions in which colonization of siliceous-sponges suppressed the deposition of …
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Multiscale Structures and Mechanics of Biomineralized Lattices in Hexactinellid sponges and Echinoderms
… biogenic silica; 2) micron-sized fibrous spicule with cylindrically laminated silica layers separated by organic interfaces; 3) spicule bundles where the individual spicules merged by secondary silica deposition; 4) a centimeter-sized Voronoi-like cellular dome known as sieve plate; and 5) …
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Sequence Stratigraphy of Middle-Mississippian Carbonates of the Southern Appalachians: Tuscumbia Limestone, Tuscumbia, AL
… packstone/grainstone facies, F3: echinoderm, spicule cherty mud facies, and F4: fine-grained quartz sandstone facies. Fland Fla are interpreted to be midramp deposits. F2 is interpreted to be shallow inner ramp deposits. F4 is interpreted to be a beach environment. Additionally, a spicule-rich …
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High Resolution Paleothermometry Using Biogenic Silica: A Feasibility Study
… established that siliceous marine demosponge spicules undergo changes to their infrared absorbance spectra upon heating (Sandford, 2003), and dehydration work by him and Jensen et al., offer encouraging indications that comprehensive alterations occur to siliceous sponge spicules heated …