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Majiaogou Formation

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Journal Article

A NEW ORDOVICIAN CHIASTOCLONELLID SPONGE FROM INNER MONGOLIA, CHINA Available to Purchase

J. KEITH RIGBY, BENJAMIN J. KESSEL, BRADLEY D. RITTS, SCOTT J. FRIEDMAN
Published: 01 July 2006
Journal of Paleontology (2006) 80 (4): 775–779.
DOI: https://doi.org/10.1666/0022-3360(2006)80[775:ANOCSF]2.0.CO;2
... in shallow water ( Fig. 2 ). These storm-influenced beds are overlain by quartz sandstones that are cross-bedded with hummocky stratification and that are interbedded with dolomitic mudstones. These units underlie the sponge-bearing Ordovician beds. The sponge-bearing beds of the Majiaogou Formation...
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Figure3—Holotype of Craterospongiells sinica n. gen. and sp. from the Middle Ordovician Majiaogou Formation, Suhaitu section, Zhuozi Shan, Inner Mongolia, China. 1, Side view of the holotype with prominent parallel canals on the dermal surface, some of which are filled with dark matrix, and general form of the genus and species; spicule structure has been largely destroyed in the lighter lower part where the skeleton has been replaced by microspheroidal, limonite-stained, silica, ×1. 2, Diagonal view of the lower part of the holotype and the vertical axial section, with outer skeletal layer removed in small broken area on the right, where canals parallel to those of the dermal surface are exposed in the interior of the sponge wall, ×1. 3, Vertical axial section of the holotype shows its thin-walled, basin-shaped form and the layered nature of its skeleton, which is divided by a prominent layer of parallel canals near midwall that are filled with darker matrix. Thin darker gastral and dermal parts of the skeleton, where spicule structure has been destroyed, borders lighter intermediate parts of the skeleton where spicules are well preserved, ×1. 4, Photomicrograph shows irregular spicule structure of the middle part of the wall, with dark-stained multirayed chiastoclones (arrow) in lighter recrystallized silica, with dark replaced gastral layer, above, and dark, matrix-filled canals, below, ×20. 5, Photomicrograph showing crude-layered nature of the skeleton, as replaced and preserved, with mixed chiastoclones and dendroclones, between dark thin gastral margin layer, above, and dark matrix-filled canals, below; fragmental matrix filling of the broad spongocoel caps the dark gastral layer on the upper right, ×20. 6, Photomicrograph of isolated large chiastoclone (C) showing characteristic variation in major shaft and irregular rays within the skeleton, and associated simpler dendroclones (D), ×50

Figure 3 —Holotype of Craterospongiells sinica n. gen. and sp. from the ... Available to Purchase

Published: 01 July 2006
Figure 3 —Holotype of Craterospongiells sinica n. gen. and sp. from the Middle Ordovician Majiaogou Formation, Suhaitu section, Zhuozi Shan, Inner Mongolia, China. 1, Side view of the holotype with prominent parallel canals on the dermal surface, some of which are filled with dark matrix