Esopus Shale (467 ft):

Shale, medium-dark-gray to dark-gray, very limy (may be nearly 50 percent calcite); slightly siliceous in lower part; insoluble residue of medium-light-gray silt aggregate; pyrite; brachiopods in lower part---

Shale, medium-dark-gray, very limy; insoluble residue of medium-light-gray silt aggregate; pyrite; becomes less limy downward; grades into underlying unit__

Shale, medium-dark-gray, limy; insoluble residue of mediumlight-gray to dark-gray silt aggregate; pyrite; brachiopods at 7,840 and 7,880 ft..

Shale, medium-dark-gray, slightly limy, pyrite; brachiopods at 7,935 and 8,030 ft--

Shale, medium-dark-gray--

Shale, dark-gray, finely micaceous, slightly limy--Oriskany Group:

Shriver Chert (128 ft):

Limestone, finely mottled light- and medium-gray, siliceous,
cherty, fine-grained to finely crystalline; 30 percent light-
brownish-gray translucent chert; insoluble residue of a
coarse-grained siliceous silt-nearly chert in part and
dark-gray silt aggregate in part----

Limestone, medium-brownish-gray, silty, very cherty, fine-
grained; nearly 50 percent brownish-gray conchoidal-
fracturing limy subtranslucent chert-under water, rock
shows small "cloudy" limy inclusions‒‒‒‒‒‒
Limestone, medium-gray to brownish-gray, silty, siliceous,
fine-grained; insoluble residue of siliceous silt aggregate
resembling chert; brachiopods----

Depth

(feet)

7, 725-7, 760

7,760-7, 830

7, 830-7, 910

7, 910-8, 050

8, 050-8, 155

8, 155-8, 192

8, 192-8, 205

8, 205-8, 210

8, 210-8, 220

Chert, brownish-gray to dark-gray, silty, very limy, com-
pact to fine-grained; subconchoidal fracture; medium-
gray mottled siliceous limestone beds; insoluble residue
of hard siliceous silt aggregate grades to dense chert---- 8, 220-8, 230
Chert (similar to unit above); grades downward to darker,
more silty and shaly rocks_

8, 230-8, 240

Limestone, dark-gray, very silty, very siliceous, finegrained; dark-gray very limy shale beds at 8,255-8,260 and 8,275-8,285 ft; insoluble residue of dark-gray silt aggregate that is nearly chert in part; grades downward to very limy shale of underlying unit; brachiopods_-_-_ 8, 240-8, 320 Helderberg Group:

Port Ewen Limestone equivalent (179 ft):

Shale, grayish-black, finely micaceous, very limy; trace of
pyrite at 8,420 ft; gastropods at 8,426 ft....
Siltstone, medium-gray, very limy, hard___
Shale, grayish-black, finely micaceous, limy

Siltstone, dark-gray, finely micaceous, limy; grades to
silty shale; finely crystalline pyrite...

Becraft Limestone (18 ft):

Limestone, medium- to dark-gray, finely micaceous, very
silty, fine-grained; interbedded with dark-gray very limy
shale in lower part; pyrite; very fossiliferous crinoids,
brachiopods, bryozoans?, ostracodes.

799-644 0-66- 6

8,320-8, 430

8, 430-8, 440

8, 440-8, 475

8, 475-8, 499

8, 499-8, 517

Helderbeg Group-Continued

New Scotland Limestone equivalent (66 ft):

Shale, dark-gray, finely micaceous, very limy; silty in part;
trace of thinly bedded very silty limestone in lower part;
trace of pyrite; ostracodes---.

Kalkberg Limestone (35 ft):

Limestone, medium-gray to medium-light-gray, very silty,
fine-grained; 5 percent medium-gray to light-brownish-
gray dense chert; insoluble residue of medium-light-gray
siliceous silt aggregate; pyrite; ostracodes and brachio-
pods

Total depth---

REFERENCES CITED

Depth (feet)

8, 517-8, 583

8, 583-8, 618

8, 618

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