WILLIAMS AND 
KINDLE. 
GULF BROOK SECTION. 93 
Mr. A. T. Lilley, of Leroy, published a description of the Gulf 
Brook section in 1886/' Lilley's section was republished by Lesley in 
1892.* The writer is indebted to Mr. Lilley, who generously assisted 
in remeasuring and in collecting from the several zones of the section. 
Beds 63 to ()C} of Lilley's section are omitted from the present section, 
since it is intended to include only those shown in the continuous sec- 
tion of Gulf Brook Gorge. The position of these beds with reference 
to the rest of the section, moreover, is problematical, since they out- 
crop in a horizontal position about 2 miles north of the Gulf Brook 
Gorge, near the axis of the Towanda anticline. The beds of the 
Leroy section dip to the south at angles varying from a maximum of 
60° or more at the south end of the gorge to 5° or 6° at the north end, 
and expose the following strata: 
Section 1455 A at Gulf Brook, Bradford County, Pa. 
Ft. in. 
99. Olive-gray sandy shale 90 
98. Olive-gray flags 12 
97. Olive-gray sandy shale 40 
96. Calcareous gray sandstone 1 
95. Brownish to olive, thin-bedded sandstone 6 
94. Olive sandy shale and thin-bedded sandstone 20 
93. Hard gray flagstone 8 
92. Olive sandy shale 28 
91. Reddish and gray sandy beds 10 
90. Reddish sandy beds 14 
89. Olive-gray shelly sandstone 12 
88. Olive-green sandy shale 9 
87. Gray limestone 4 
86. Argillaceous green and reddish shale 7 
85. Hard dark-red and mottled red and green bed 3 
84. Soft argillaceous red shale 3 
83. Covered 15 
82. Hard red sand y beds 5 
81. Dark-red ferruginous beds 3 6 
80. Dark-red to greenish sandy beds 5 
79. Dark-red low-grade iron ore 3 6 
78. Dark-red to purple and gray sandy beds 9 
77. Greenish shale and hard bluish-gray thin-bedded sandstone 20 
76. Dark-colored shale with bands of iron ore 4 
75. Reddish crinoidal limestone 3 
74. Olive sandy shale 8 6 
73. Reddish limestone 10 
72. Olive-gray sandy shale with calcareous bands 17 
71. Olive-green shaly sandstone, weathering brown, containing small chalco- 
pyrite crystals 3 
70. Hard bluish-gray to olive sandstone 20 
69. Reddish to gray sandstone with limestone bands 4 
68. Olive-gray shaly sandstone 20 
aProc. Am. Philos. Soc, vol. 23, pp. 291-293. 
& Summary Final Rept. Second Pennsylvania Geol. Survey, vol. 2, pp. 1448-1450. 
Bull. 244—05—7 
