MolluscaBase source details
Richardson, Eugene S. Jr. (1956). Pennsylvanian invertebrates of the Mazon Creek area, Illinois: marine fauna. Fieldiana: Geology. 12(3): 59-67.
450257
10.5962/bhl.title.3388 [view]
Richardson, Eugene S. Jr.
1956
Pennsylvanian invertebrates of the Mazon Creek area, Illinois: marine fauna.
Fieldiana: Geology
12(3): 59-67
Publication
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The occurrence of fossil invertebrates in the Middle Pennsylvanian Francis Creek shale of Will and Grundy counties, Illinois, has been discussed (this volume, no. 1). The fauna is composed almost entirely of land and fresh-water forms, inhabiting a vegetated delta plain during submergence of a coastal plain. There they were associated with the famous Mazon Creek flora. A very few fossils of marine animals are found in the spoil heaps of the strip mines, where the overburden of concretion-bearing Francis Creek shale has been piled, in mining for the underlying Number 2 (Wilmington) coal. Fossils of the plants and terrestrial invertebrates are common in the concretions.
Marine forms known to me include a serpulid worm, an amphineuran, and a pectinoid clam, all described below; a trilobite, which Professor J. Marvin Weller once saw in a private collection but which I have not seen; a few teeth of xenacanth sharks and one fragment of shark cartilage; and one coiled cephalopod. As the cephalopod came to my attention while this paper was in press, I cannot include a description of it here.
The occurrence of fossil invertebrates in the Middle Pennsylvanian Francis Creek shale of Will and Grundy counties, Illinois, has been discussed (this volume, no. 1). The fauna is composed almost entirely of land and fresh-water forms, inhabiting a vegetated delta plain during submergence of a coastal plain. There they were associated with the famous Mazon Creek flora. A very few fossils of marine animals are found in the spoil heaps of the strip mines, where the overburden of concretion-bearing Francis Creek shale has been piled, in mining for the underlying Number 2 (Wilmington) coal. Fossils of the plants and terrestrial invertebrates are common in the concretions.
Marine forms known to me include a serpulid worm, an amphineuran, and a pectinoid clam, all described below; a trilobite, which Professor J. Marvin Weller once saw in a private collection but which I have not seen; a few teeth of xenacanth sharks and one fragment of shark cartilage; and one coiled cephalopod. As the cephalopod came to my attention while this paper was in press, I cannot include a description of it here.
America, North
Paleontology, Fossils, Paleobiology
Systematics, Taxonomy
Systematics, Taxonomy
Helminthochiton concinnus E. S. Richardson, 1956 † accepted as Glaphurochiton concinnus (E. S. Richardson, 1956) † (original description)
