Page:The Eurypterida of New York Volume 1.pdf/107

These sections show that the Eurypterus-bearing black shales are intercalated in red and green shales with thinner beds of dolomites and mudrocks. The waterlime and shale occurrences of Eurypteri in these Salina beds are hence not expressions of different biologic facies.

---

The eurypterid fauna occurs in the black shale, nos. 8 and 10 in the foregoing table.
From wells of the neighborhood of the preceding locality the following section has been obtained by Sarle:

Salina

Top		Feet	Inches
1	Red shale or marlite	10
2	Hard, fine grained, yellowish dolomite, having an imperfect conchoidal fracture	2
3	Red shale	1
4	Break estimated at	3
5	Dolomite like no. 2	3
6	Green shale or marlite	4
7	Red shale	1	8
8	Break estimated at about	2
9	Green shale	2	5
10	Black shale, very fine textured, fissile and with 1 inch dolomite parting (eurypterid horizon)	1	6
11	Green shale	1
12	Dolomite like no. 2	2
13	Green shale or marlite	6
	From west branch of Allen creek:
14	Light colored waterlime, some pyrites and sun cracks	5
15	Pea-green shaly marlite	7
		51	7

Niagaran

16	An impure yellowish porous limestone
17	Succeeded by an impure bituminous limestone made up of imbricating, shell-like domes, etc.