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A large concretion in the black shale above Springfield Coal Member (No. V), Desmoinesian Series, Pennsylvanian, from the Blackfoot #5 mine, Pike County, Indiana, contains a piece of fossil wood with excellent preservation of cell structure. Both ends of the wood extending outward to the extremities of the ovoid concretion are replaced by a black calcareous rock in which there is no fossil wood structure. These end zones have sharp contacts with the concretion matrix and their dimensions correspond to those of the fossil wood plus associated calcite veins. These relations indicate that the concretion must have been well-established before the wood had suffered any structural disintegration through bacterial activity. The preservation of the central section of the wood was the result of early concretion formation, while the ends continued to rot away as they were open to the environment. -- This is further evidence for the rapid early diagenetic origin of many concretions, particularlly those associated with well-preserved fossils.
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Subjects
Paleobotany, Fossil Trees, Black shales, ShalePlaces
Indiana, Pike CountyTimes
PennsylvanianShowing 2 featured editions. View all 2 editions?
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Time factors of differentially preserved wood in two calcitic concretions in Pennsylvanian black shale from Indiana
1975, Field Museum of Natural History
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Time factors of differentially preserved wood in two calcitic concretions in Pennsylvanian black shale from Indiana
1975, Field Museum of Natural History
in English
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- Created April 1, 2008
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February 11, 2012 | Edited by ImportBot | import new book |
April 14, 2010 | Edited by Open Library Bot | Linked existing covers to the edition. |
December 14, 2009 | Edited by WorkBot | link works |
April 1, 2008 | Created by an anonymous user | Imported from Internet Archive item record |