. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. RAYMOND: CORRELATION OF THE ORDOVICIAN STRATA. 257 above), and the Clitambonites bed (zone 6). The zone 7, with its large gastropods, particularly the Fusispiras and Trochonemas, Cyclo- spira hisulcata, Rafinesquina deltoidea, and Strophomena trilohata, is an exact counterpart of the Picton of Ontario. The Chtambonites beds of both Ontario and Minnesota are char- acterized by the same species of Clitambonites and Parastrophia, and there are many more fossils common to the two. The Decorah shales of Minnesota
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. RAYMOND: CORRELATION OF THE ORDOVICIAN STRATA. 257 above), and the Clitambonites bed (zone 6). The zone 7, with its large gastropods, particularly the Fusispiras and Trochonemas, Cyclo- spira hisulcata, Rafinesquina deltoidea, and Strophomena trilohata, is an exact counterpart of the Picton of Ontario. The Chtambonites beds of both Ontario and Minnesota are char- acterized by the same species of Clitambonites and Parastrophia, and there are many more fossils common to the two. The Decorah shales of Minnesota have been correlated by Dr. Ulrich with the strata above the Leray-Black River and below the cystid beds at Kirkfield, Ontario, and on this point we are in agree- ment. The Stewartville dolomite is not present in Ontario, nor have any NORTHERN DOLGEVILLE PfiTTERSONVILLE HY. M/NN. ONTARIO NX ALBAHY TRENTON FALLS \ CMAJOHftRIE 3CHENECTADY. CYMTHIANA? '1 * I ' -" STEWARTVI ;^'^.PULA5ki:^vi:^V;>Vâ ^^^^^â¢â ::^:^^^^^ LADDER. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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