Page:The Eurypterida of New York Volume 1.pdf/105

 animals. The most characteristic of eurypterid rocks is the waterlime. It is in this that the faunas of Kokomo and of the Bertie waterlime of New York are contained. How close is this association of eurypterids and waterlime, is shown by the fact that with the recurrence of waterlime formation (Rondout) in the Salina section after the close of the salt deposition and the Cobleskill dolomitic limestone stage, Eurypterus reappears, though much diminished in number, and later again, after the introduction of the Manlius fauna the upper waterlime bed of the Manlius brings back a single species. The section at Manlius given by Hartnagel [1903, p. 1165] illustrates well the intimate connection of waterlimes with eurypterids on one hand and the intercalation of limestones with Stromatopora and brachiopods on the other.