Enumeration of Fossils Collected in the Niagara Limestone at Chicago, Illinois: With Descriptions of Several New Species (Classic Reprint) - Tapa dura

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Excerpt from Enumeration of Fossils Collected in the Niagara Limestone at Chicago, Illinois: With Descriptions of Several New Species

We do not intend to be understood by what is stated above, of the upper and lower portions of the exposure, that in our Opinion we recognize here the line of demarcation between two stages of the formation, not considering our data sufficient to justify a con elusion on this point.

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