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Ultrastructure and Composition of Brown Bodies in Some Ordovician Trepostome Bryozoans
Stanley J. Morrison and Robert L. Anstey
Journal of Paleontology
Vol. 53, No. 4 (Jul., 1979), pp. 943-949
Published by: SEPM Society for Sedimentary Geology
Stable URL: http://www.jstor.org/stable/1304117
Page Count: 7
You can always find the topics here!Topics: Fossils, Carbon, Calcite, Crystals, Electrons, Silicon, Chemical composition, Electron micrographs, Paleontology, Body tissues
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Brown bodies in Ordovician trepostome bryozoans are permineralized pseudomorphs of the original brown bodies, which were degeneration remnants of the soft tissues of the polypide. Ordovician brown body cellular grains appear in light micrographs as mottled, puffy spheroids, and are morphologically indistinguishable from those in Holocene brown bodies. They also contain organic compounds, based on positive histological staining and high carbon concentrations determined from electron microprobe analysis. However, no cellular fine structure has been preserved. Transmission electron microscopy indicates that they are extensively permineralized by a bladelike mineral, probably an authigenic aluminosilicate.
Journal of Paleontology © 1979 SEPM Society for Sedimentary Geology