The Genus Heliophyllum (Anthozoa, Rugosa) In the Upper Middle Devonian (Givetian) Of New York (Classic Reprint) - Hardcover

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Excerpt from The Genus Heliophyllum (Anthozoa, Rugosa) In the Upper Middle Devonian (Givetian) Of New York<br/><br/>Text  figure 2.  Index map of New York showing the approximate outcrop area of Middle Devonian Strata. It is impractical to Show the minute quadrangle boundaries at this scale but the counties, some of the principal cities, and seven regional reference points are labeled as an aid in finding the approximate positions of collection localities mentioned in the text and the Appendix. Modified from various small  scale outline maps of the New York State Geological Survey.

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