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Susquehanna Group Continued

Catskill Formation-Continued
Zone E-Continued

75. Sandstone, brownish-gray, fine-grained, micaceous, limy,
poorly sorted____

74. Claystone, brownish-gray; basal contact sharp, even_-_-
73. Sandstone, greenish-gray, fine-grained_‒‒‒‒

72. Sandstone, greenish-gray, medium-grained, crossbedded;
some grayish-red mica_-_.

71. Sandstone, greenish-gray, fine-grained, micaceous, cross-
bedded..

70. Sandstone,

greenish-gray,

medium-grained, poorly

sorted; conglomerate lenses containing quartz pebbles
as much as 1⁄2 in. long---

69. Sandstone, greenish-gray, medium-grained; grades up-
ward to coarse-grained sandstone containing clay
pebbles----

68. Sandstone, greenish-gray, limy; fine-grained at base,
grading upward to coarse grained; quartz pebbles as
much as 1⁄2 in. in diameter___.

Part of zone E measured_

Zone D:

Feet

1

1

7

3

10

7

30

850

67. Sandstone, greenish-gray, fine-grained to very fine
grained, crossbedded; contains limy "glomerate" lenses
in upper part; basal contact sharp------
66. Siltstone, grayish-brown, micaceous, clayey, subfissile;
beds as much as 2 in. thick; plant debris; several limy
sandstone lenses; locally crossbedded "glomerate" bed
at base; upper surface fluted____.

65. Sandstone, greenish-gray, very fine to fine-grained, very
micaceous, locally ironstained; beds 4-2 in. thick;
slightly crossbedded in long sweeps; grades to grayish
brown in upper 11⁄2 ft; basal contact sharp,
conformable

64. Claystone, grayish-brown, fissile to indistinctly bedded;
sandstone lenses---

[blocks in formation]

63. Claystone, greenish-gray, fissile to indistinctly bedded,
micaceous; weak unit_---

62. Sandstone, greenish-gray, fine-grained micaceous, well-
sorted; beds 1 in. thick; incipient crossbeds; about one-
third of beds in lower 20 ft are lenticular, limy, "pock
marked"

61. Claystone, grayish-brown, silty, micaceous, locally limy;
1 or 2 "glomerate" lenses; 2 lenticular sandstone beds;
grades downward to very fine grained sandstone in
lower 2 ft.___.

3

48

30

60. Claystone, grayish-brown, silty, locally limy; basal con-
tact gradational_____

5

59. Sandstone, grayish-brown, very fine grained, micaceous;
limy zone 2 ft thick at base; lenticular; resistant to
weathering

8

Susquehanna Group-Continued

Catskill Formation-Continued
Zone D-Continued

58. Claystone, grayish-brown, silty, micaceous; limy in part ;
very fine grained brownish-gray sandstone lenses___
57. Claystone, grayish-brown, silty, poorly bedded; several
lenticular "pock-marked" limy zones; basal contact
gradational..

56. Sandstone; greenish gray in lower 5 ft, brownish gray in
upper 9 ft; very fine grained; sparse incipient
crossbeds__

55. Claystone, grayish-brown, and grayish-brown siltstone
interfingering with greenish-gray very fine grained
sandstone and long "glomerate" lenses that contain a
few clay pebbles____

54. Sandstone; greenish gray in basal 5 ft grading upward to
grayish brown in upper 6 ft; very fine grained; beds
flaggy; some crossbedding___.

53. Claystone, grayish-brown, silty, fissile; limestone nodules
as much as 1 in. in diameter in several "pock-marked"
limy zones; limy "glomerate" bed 2 ft thick______.
52. Sandstone, greenish-gray, fine-grained, crossbedded;
beds 1-8 in. thick; limy lenses in upper half; two
fissile shale lenses as much as 6 in. thick_-_-

51. Claystone, grayish-brown, silty, indistinctly bedded,
micaceous; limy and "pock-marked" in upper 8 in----
50. Sandstone, brownish-gray, very fine grained, micaceous ;
beds 6-18 in. thick; slightly crossbedded---.
49. Claystone, grayish-brown, silty, fissile to indistinctly
bedded, locally slightly limy; siltstone lenses----
48. Siltstone, brownish-gray, coarse-grained, hard, massive_
47. Claystone, grayish-brown, silty, fissile to indistinctly
bedded, locally slightly limy; limy "worm-eaten" silt-
stone in upper 1 ft; "wormholes" result from leaching
of limestone grains that average about 5 mm long____
46. Claystone, greenish-gray, silty, fissile, micaceous; grades
upward to brownish-gray siltstone in upper 1 ft______
45. Sandstone, brownish-gray, very fine grained, clayey,
micaceous, well-sorted; beds 2-12 in. thick; basal con-
tact gradational___.

44. Sandstone, greenish-gray to slightly grayish-brown, fine-
grained, clayey; abundant coarse-grained mica; beds
2-12 in. thick.......

43. Claystone, grayish-brown, silty; grades upward and
laterally to limy fine-grained crossbedded sandstone
that contains pebbles of shale; grades to greenish-gray
claystone in places----

42. Sandstone, greenish-gray, fine-grained, micaceous; a few
long sweeping crossbeds; contains 2 greenish-gray
claystone lenses__.

Feet

8

23

14

8

11

17

12

3

4

6

5

4

10

17

41. Claystone, grayish-brown, silty, indistinctly bedded; some
interbeds of greenish-gray siltstone; limy zones..

3

Susquehanna Group-Continued

Catskill Formation-Continued

Zone D-Continued

40. Sandstone, greenish-gray, medium-grained, micaceous;
beds indistinct, 2-6 in. thick; slightly crossbedded ;
angular to subrounded grains_

39. Claystone, grayish-brown, silty; grades upward to very
fine grained sandstone; slightly limy; 2 limy fine-
grained sandstone lenses about 4 in. thick; weak unit.
38. Sandstone, grayish-brown, fine-grained; beds 1-4 in.
thick; moderately crossbedded; slightly limy; basal
contact gradational__.

37. Sandstone, greenish-gray, slightly limy; medium grained
in basal 5 ft, fine grained above; beds 1-4 in. thick;
moderately crossbedded; several limy and clayey
"pock-marked" zones; shale chips as much as 11⁄2 in.
long and poorly preserved plant debris in basal 1 ft--
36. Sandstone, greenish-gray, fine- to medium-grained;
grades upward to silty claystone in upper 11⁄2 ft; beds
3 in. thick; moderately crossbedded; limy "pock-
marked" very fine grained sandstone lens as much as
8 ft thick; a few clay pebbles; resistant to weather-
ing; flute casts at base___

35. Sandstone, greenish-gray, fine- to coarse-grained, mica-
ceous, poorly sorted; beds 4 in. thick; incipient cross-
beds; greenish-gray shale lenses 1 in.-1 ft thick;
fluted casts at base; basal contact sharp, irregular___
34. Claystone, grayish-brown; grades upward to greenish
gray at top; silty, sandy, coarsely micaceous; beds
fissile to indistinct; limy lens 6 ft below top; grades
laterally to siltstone lenses and very fine grained sand-
stone lenses; weak unit; basal contact gradational--
33. Sandstone, brownish-gray; fine grained at base, grades
upward to massive grayish-brown siltstone; basal con-
tact gradational_.

32. Sandstone, greenish-gray, fine-grained; crossbedded in
both long and short sweeps; angular to subangular
grains; greenish-gray shale lens as much as 1 ft thick
5 ft above base; limy sandstone lens 8 in. thick con-
taining clay pebbles about 3 ft above base of unit;
basal contact gradational___.

31. Sandstone, greenish-gray, coarsely micaceous; scattered
white quartz granules and pebbles as much as 4 in.
long in a predominantly fine-grained matrix; beds in-
distinct, 1-4 in. thick; crossbedded in both long and
short sweeps: poorly sorted; angular to subangular
grains ironstains give unit "salt-and-pepper" appear-
ance; limestone and shale pebbles as much as 1 in.
long in basal 1 ft; shale lens 1 ft thick 8 ft above base.
County-line marker on west side of highway, at base
of unit, in Ransom quadrangle___

Total zone D..

Feet

5

11

4

14

20

7

9

19

20

423

Feet

20

3

2

223

9

9

Susquehanna Group-Continued

Catskill Formation-Continued

Zone C:

30. Sandstone, greenish-gray, fine-grained, slightly cross-
bedded; beds 1-4 in. thick; grades into fissile siltstone
in upper 1 ft; weak unit__
29. Sandstone, greenish-gray,

fine-grained, nonbedded;
weathers to knobby yellowish-green surface; coalified-
plant beds as much as 2 in. thick. Unit is lens 30 ft
long that is equivalent, laterally, to a “glomerate”----
28. Claystone, greenish-gray, silty, fissile to indistinctly
bedded---

27. Sandstone, greenish-gray, very fine grained, micaceous;
beds 1-3 in. thick; crossbedded in lower 15 ft; forms
ledge----

26. Claystone, grayish-brown, silty, indistinctly bedded;
"glomerate" lens 2-3 ft thick at top weak unit‒‒‒‒‒
25. Sandstone, greenish-gray; grades to brownish gray in
upper 3 ft; very fine grained____

24. Siltstone, grayish-brown, fissile to distinctly bedded____
23. Sandstone, greenish-gray, slightly limy, fine-grained;

beds 1-6 in. thick; slightly crossbedded; "glomerate"
5 ft thick 5 ft above base. Base of unit is at road level
beneath powerline that crosses river to powerplant_-_-

22. Siltstone and claystone, grayish brown; greenish gray in
upper 2 ft; "glomerate" lenses locally in upper 2 ft.
21. Sandstone, light-brownish-gray, fine-grained_.

20. Claystone, grayish-brown, silty; “glomerate" lens 6 in.
thick in middle of unit..

19. Sandstone, grayish-brown, fine-grained..

18. Claystone, grayish-brown, silty---.

17. Siltstone, greenish-gray; basal contact irregular___

16. Sandstone, greenish-gray, fine-grained well-sorted; many
accessory minerals; massive when fresh; beds 1-4 ft
thick; basal contact sharp_---

[blocks in formation]

15. Claystone, grayish-brown, silty, fissile to indistinctly
bedded----

14. Siltstone, greenish-gray; "blobs" of grayish-brown clay;
partly crossbedded____.

3

13. Sandstone, greenish-gray, very fine to fine-grained; beds
1-4 in. thick; shale and "glomerate" lens 3 ft thick
8 ft above base; "glomerates" also at 14 and 27 ft
above base; crossbedded and more flaggy in upper 3 ft
12. Claystone, grayish-brown, silty; "glomerate" lens 1 ft
thick at top; weak but persistent unit-------

[blocks in formation]

11. Sandstone, greenish-gray, very fine grained and brown-
ish-gray siltstone; beds 4-1 in. thick; micaceous, well
sorted; brownish gray in upper 4 ft; basal contact
sharp

10. Siltstone, grayish-brown, fissile to indistinctly bedded;
few crossbeds_-_-

15

11

Susquehanna Group Continued

Catskill Formation-Continued
Zone C-Continued

9. Sandstone, greenish-gray, very fine grained, well-sorted,
micaceous; beds 1-6 in. thick; forms slope..

8. Covered interval..

7. Shale, brownish-gray, and interbeds of greenish-gray
sandstone; beds 1 in-1 ft thick; 1 shale bed 3 ft thick
3 ft below top; forms slope; partly covered_

6. Covered Interval..

5. Sandstone, olive-gray, very fine to fine-grained; beds
4 in. thick to massive; slightly crossbedded, mica-
ceous, clayey, dirty-

4. Covered interval_._.

3. Sandstone, as in unit 5 above..

2. Covered interval..

1. Sandstone, greenish-gray, very fine to fine-grained,
slightly micaceous, well-sorted; beds 4-2 in. thick;
slightly crossbedded; most crossbedding in upper part;
"glomerate" beds in middle; shale lenses near base,
middle, and top; forms isolated ledges along slope.
Unit is 50-75 percent covered in lower 25 ft. Top of
unit is approximately the top of Buttermilk Creek
section_____

Part of zone C measured___

Part of Catskill Formation measured__.

BUTTERMILK CREEK

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The Buttermilk Creek section begins at road level on the east side of the Susquehanna River at the north end of the cliff about 600 ft south of the bridge over Buttermilk Creek at Falls, Pa. The section extends up the steepest accessible part of the north end of the cliff. The upper 60 feet is the approximate stratigraphic equivalent of the lower 60 feet of the Powerline C section.

Susquehanna Group:

Catskill Formation:

Zone C:

24. Sandstone, greenish-gray to olive-gray, fine-grained to
very fine grained; beds 4-2 in. thick; slightly cross-
bedded in long sweeps; "glomerate" beds at 15 to 20 ft
above base: 4-ft-thick grayish-brown siltstone unit in
14-in.-thick beds 35 ft above base; poorly exposed to
partly covered in upper 20 ft----

23. Covered interval; forms slope..

22. Sandstone, olive-gray, fine-grained, micaceous; some me-
dium grains in lower part; angular to subangular
grains; beds 4-1 in. thick; abundant crossbedding :
basal surface fluted; basal contact sharp. Base is ap-
proximate stratigraphic top of Ransom A section____.

Feet

64

20

13

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