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(Davidsion Co., TN)
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(Decatur Co, TN)
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Site #3
(McNairy Co., TN)
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For the second exercise, I will start by identifying our fossils.
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(Davidsion Co., TN)
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(Decatur Co, TN)
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Site #3
(McNairy Co., TN)
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We don't yet know for sure whether these three collections of fossils were deposited at the same time or not.
To get a better view of this issue, we neet a way to identify
| Region | Towns | Strata |
| Middle Tennessee | Nashville, Murfreesboro, Lebanon, Carthage | Stones River Group
Nashville Group |
| Upper Mississippi Valey | Minneapolis-St. Paul, MN; Rochester, MN; Appleton, WI; Galena, IL; Decorah, IA | Galena Group, Decorah Shale, Dunleith Formation |
| Eastern Missouri | Allenton, Pevely, Ste. Genevieve, Altenburg, Cape Giradeau | Platin Group, Decorah Shale |
| North Central Kentucky,
Southern Ohio |
Cincinnati, OH; Frankfurt, KY; Lexington, KY | Tyrone Limestone, Lexington Limestone |
| Northern Virginia,
Eastern West Virginia |
Shenandoah Valley, Martinsburg, Strasburg, Mauzy, Colliersville | Martinsburg Formation |
| Central Pennsylvania | Nittany Valley, Harrisburg | Nealmont Formation, Salona Formation |
| Upstate New York | Mohawk Valley, Booneville, Middleville | Black River Group, Trenton Group |
| Southern Ontario | Toronto, Kingston, Ottawa, Montreal | Black River Group, Trenton Group |
Dennis R. Colata, Warren D. Huff, and Stig M. Bergstrom, Ordovician K-Bentonites of Eastern North America, Geological Society of America, Special Paper 313, 1996.
Are the fossils found near the bentonite from the Taconic Orogeny in Davidson County, also found in other strata laid down at the same time?
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Missouri 2 |
Ohio 3 |
West Virginia 4 |
Pennsylvania 5 |
New York 6 |
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- | - | - |
| fossils found in Decatur County, TN (Ross Formation) | Upper Mississippi Valley | Eastern Missouri | Kentucky, Ohio | Virginia,
West Virginia |
Central Pennsylvania | Upstate New York | Southern Ontario |
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Do strata deposited at different times have the same fossils?
| fossils found in McNairy County (Coon Creek Formation) | Upper Mississippi Valley 1 | Eastern Missouri | Kentucky, Ohio | Virginia,
West Virginia |
Central Pennsylvania | Upstate New York | Southern Ontario |
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How can you explain that the fossils found in Nashville are so similar
to fossils which were deposited at the same time elsewhere in the country,
while so different from fossils found at the other two sites in Tennessee?
1. Robert E Sloan (ed) Middle and Late Ordovician Lithostratigraphy and Biostratigraphy of the Upper Mississippi Valey, University of Minnesota Report of Investigations # 35 Saint Paul, 1987. 2. Fenton, C.L., 1928, The St4ratigraphy and Larger fossils of the Plattin Group in Ste. Genevieve County, Missouri. American Midland Naturalist (Notre Dame), 11(2): 86-96. 6. Wright, T.O. & Caldemeyer, R.D. 1977. Invertebrate fossils from Schochary Ridge, Berks and Lehigh Counties, Pennsylvania. Pennsylvania Academy of Science Proceedings (University Park), 51 (2): 153-156. 7. Wilson, A.E. 1946. Brachiopoda of the Ottawa Formation of the Ottawa-St. Lawrence Lowland. Geological Survey of Canada, Bulletin (Ottawa), 8:1-149. 11 Pl.s.
