Stratigraphy of the Ancell and Black River Groups (Ordovician) in Indiana (1982)

Item Number: OP36
Price FREE
Download Download PDF

Authors: John Droste
Talal Abdulkareem
John Patton

ABSTRACT: Stratigraphic correlations and nomenclature are here proposed for the Ordovician rocks between the Knox Dolomite and the Trenton Limestone in the Indiana subsurface. We continue the use of names now used in Indiana for some units and propose the adoption of other existing names for certain units traced into Indiana from Illinois. Two groups, and Ancell Group (adopted Missouri-Illinois name) below and the Black River Group (new rank) above, are composed of five formations. The Ancell Group consists of the St. Peter Sandstone and two units with which it is in facies relationship, the Dutchtown Formation (adopted Missouri-Illinois name) below and the Joachim Dolomite above. The Black River Group consists of the Pecatonica Formation (adopted Wisconsin-Illinois name) below and the Plattin Formation (adapted from the Illinois subgroup name) above. The distribution of continuous St. Peter rocks, the sandstone facies of the Ancell Group, is restricted to westernmost Indiana. The carbonate and terrigenous clastic rocks of the Dutchtown are much more widespread, and the carbonate and terrigenous clastic rocks of the Joachim are present throughout Indiana except where erosional topographic highs on the Knox surface lie directly below rocks of the Black River Group. The Pecatonica and Plattin Formation are continuous throughout Indiana. Earlier workers have emphasized the likelihood that some sandstone bodies encountered in wells at this position in the stratigraphic succession and identified as the St. Peter were probably actually part of the Knox. Sandstones regarded as part of the Knox because they are encountered outside the general area in which the St. Peter is expected to be present may be isolated remnants of the St. Peter, and especially in the southeastern quadrant of Indiana, they are even more likely to be what we are here terming the Dutchtown. In the northeastern quadrant of Indiana, they may be sandstone layers within the Joachim.



Droste, J. B., Abdulkareem, T. F., Patton, J. B. 1982,  Stratigraphy of the Ancell and Black River Groups (Ordovician) in Indiana: Indiana Geological Survey Occasional Paper 36, 15 p., 4 fig.


You may also like:

Keywords: Knox Dolomite, Trenton Limestone, St. Peter Sandstone, Dutchtown Formation, Joachim Dolomite, Pecatonica Formation, Plattin Formation, stratigraphy, Ancell Group, Black River Group, Ordovician

Can't find what you're looking for? Feel free to contact us directly:

Publication Sales Office
Indiana Geological and Water Survey
611 North Walnut Grove
Bloomington, IN 47405-2208
812-855-7636 (phone)
812-855-2862 (fax)
IGSINFO@indiana.edu

IGS Return Policy

All sales are final. Materials may not be returned after they have been accepted by the customer. Any discrepencies in mail orders must be reported to IGWS within 10 days of receipt of order.

The Indiana Geological and Water Survey will refund the purchase price and sales tax of products if returned with the original sales receipt within 10 days of receipt of order. Refunds will be issued with the same method of payment as indicated on the original receipt except for cash purchases, which will be refunded by check. Items must be returned in the same condition as purchased. Refunds on digital products and services are not allowed, except for defective media such as CD-ROMs, flash drives, and so on. The customer is responsible for paying shipping costs to return items.

Generating Your PDF

Your session for the Indiana Geological and Water Survey will expire in 30 minutes. Please refresh your broswer or click here to restart your session timer.