THE EURYPTERIDA OF NEW YORK IoL 
animals. The most characteristic of eurypterid rocks is the water- 
lime.’ 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 reap- 
pears, though much diminished in number, and later again, alter the 
introduction of the Manlius fauna the upper waterlime bed of the Manlius 
brings back a single species (E. microphthalmus). The section 
at Manlius given by Hartnagel? [1903, p. 1165] illustrates well the intimate 
connection of waterlimes with eurypterids on one hand and the inter- 
calation of limestones with Stromatopora and brachiopods on the other. 
1 The appended analysis of the Buffalo waterlime or cement rock, kindly furnished 
by Mr Lewis J. Bennett of Buffalo, shows the peculiar composition of this strongly 
magnesian limestone: 
Silica. ce eee eee eee ee eee es 11.48 
| ce) 0 .go 
Alumina... ce eee eens 17.50 
Carbonate of lime... 6... keene 42.75 
Magnesia (carbonate) ...... 2... eee eee 20.35 
PotasSIUM . 6... te eee nee e eens 1.00 
Sodium... eee eee .80 
Combined water and loss........... 2.00.0 c eee ees 5.22 
?>GENERAL SECTION AT MANLIUS, ONONDAGA COUNTY 
Top Feet 
1 Oriskany. Fossiliferous sandstone.............. 0.0.00. eee .5-2 
2 Helderbergian. Gray, compact fossiliferous limestone.................... 6 
3 Helderbergian. Blue limestone beds...............0 00.0.0... cee eee. 14 
4 Helderbergian. Stromatopora beds, upper portion much broken Lecce ees 12 
s Helderbergian. Blue limestone, fossils rare........... 0.0.0... 000. eee 14 
6 Manlius. Upper waterlime bed. Eurypterus at Split Rock................ 4 
+ Manlius. Blue limestone with Spirifer vanuxemi and Leper- 
Mitia Alta cece cece cece eet e eee eeneteeeees eve eeees 4 
Manlius. Lower waterlime bed............ 0.000000 c cee eee ee 4 
Manlius. Stromatopora bed at top. Blue layers below containing typical 
Manlius fauna... 1... tenet eee 65 
