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Logs of Test Holes and Wells

Listed on the following pages are logs of 31 test holes drilled by the State Geological Survey, logs of 9 test holes or irrigation wells, and the log of 1 railroad well. The locations of test holes drilled by the State Geological Survey are shown in Figure 7.

Sample logs are given for holes drilled by the State Geological Survey and from which samples were collected. Test holes 7-37-1aaa and 9-36-31ccc were drilled in 1943 as part of an investigation of the geology and ground-water resources of Thomas County. Logs of these holes were prepared by Oscar S. Fent and samples were studied by him and John C. Frye. The remainder of the state-drilled test holes were drilled in 1949; 1 collected samples of the cuttings and prepared the logs of the holes.

5-37-33cdc. Sample log of test hole in the SW SE SW sec. 33, T. 5 S., R. 37 W., Cheyenne County; drilled August 1949. Surface altitude, 3,350.7 feet; depth to water level August 14, 1949, 50.0 feet.			Thickness, feet	Depth, feet
Quaternary--Pleistocene
	Sanborn formation--Peoria silt member
		Silt, tan	1	1
Tertiary--Pliocene
	Ogallala formation
		Sand, medium to coarse, and fine gravel	9	10
		Sand, medium to coarse, and fine to coarse gravel; contains a large amount of coarse gravel	10	20
		Gravel, coarse to fine; contains a small amount of coarse sand	11	31
		Sand, medium to coarse, and fine gravel; contains greenish-brown clay	14	45
		Sand, fine to coarse, and fine to medium gravel; contains some brownish silt and clay	15	60
		Gravel, coarse to fine, and medium to coarse sand	17	77
		Mortar bed	16	93
		Silt and clay, brown	4	97
		Mortar bed containing much calcium carbonate; contains less calcium carbonate and is softer from 128 to 130 feet	33	130
		Sand, fine to medium; contains some calcium carbonate cement	12	142
		Sand, fine to medium	8	150
		Sand, fine to medium; contains some green clay	15	165
		Mortar bed; contains much lime cement	5	170
		Sand, fine to medium; contains very little cement	22	192
Cretaceous--Gulfian
	Pierre shale
		Shale, weathered, yellow-brown	5	197
		Shale, blue-black	13	210

6-38-31ccc. Sample log of test hole in the SW cor. sec. 31, T. 6 S., R. 38 W.; drilled August 1949. Surface altitude, 3,527.5 feet.			Thickness, feet	Depth, feet
Quaternary--Pleistocene
	Sanborn formation--Peoria silt member
		Silt, dark-brown	2	2
		Silt and fine to very fine sand; contains stringers of soil caliche, 10 to 25 feet	23	25
Tertiary--Pliocene
	Ogallala formation
		Silt and clay, sandy, light-brown	8	33
		Gravel, coarse, and some plastic silt and clay	8	41
		Silt and fine sand, plastic, brown; contains sand and gravel at base	9	50
		Gravel, coarse; contains a little silt and fine sand	3	53
		Silt and fine sand, plastic, brown; contains sand and gravel	8	61
		Mortar bed, soft	18	79
		Sand, medium to coarse, and fine to coarse gravel	15	94
		Sand, fine, and plastic silt	3	97
		Sand, fine to coarse; contains some fine gravel	6	103
		Sand, fine to coarse, and fine to coarse gravel	4	107
		Sand, fine to coarse, and fine to coarse gravel; contains brown plastic silt and clay	6	113
		Silt and clay, sandy, brown	17	130
		Sand, fine to coarse, and fine gravel, partially cemented; contains some silt and very fine sand	25	155
		Silt and very fine sand, plastic, brown; contains more sand from 165 to 170 feet	15	170
		Silt and very fine sand, plastic, brown; contains much sand	20	190
		Sand, fine to coarse; contains silt and clay	20	210
		Sand, fine to medium; contains silt and clay	68	278
Cretaceous--Gulfian
	Pierre shale
		Shale, yellow-brown to greenish	1	279
		Shale, dark blue-black	9	288

6-40-1aaa. Sample log of test hole in the NE cor. sec. 1, T. 6 S., R. 40 W.; drilled September 1949. Surface altitude, 3,584.1 feet; depth to water level September 6, 1949, 129 feet.			Thickness, feet	Depth, feet
Quaternary--Pleistocene
	Sanborn formation--Peoria silt member
		Silt, dark-brown to tan	15	15
Tertiary--Pliocene
	Ogallala formation
		Limestone, light-tan; "Algal limestone" at the top	13	28
		Clay and silt, sandy, red	3	31
		Mortar bed	9	40
		Silt and clay, sandy, reddish-brown	18	58
		Sand, fine to coarse	10	68
		Gravel, coarse	12	80
		Sand, fine to coarse	10	90
		Sand, very fine to medium	5	95
		Silt, sandy, brown	5	100
		Silt and very fine sand, brown	40	140
		Sand, fine to coarse, and fine gravel	18	158
		Silt and clay, sandy, light-tan	12	170
		Sand, fine to coarse, and fine gravel; contains silt and clay	20	190
		Silt and very fine sand, brown	10	200
		Silt and very fine to fine sand, light-brown	20	220
		Sand, very fine to fine	15	235
		Mortar bed	5	240
		Sand, medium to coarse	64	304
Cretaceous--Gulfian
	Pierre shale
		Shale, weathered, greenish- to yellowish-brown	6	310
		Shale, dark-blue to black	5	315

6-40-36ddd. Sample log of test hole in the SE cor. sec. 36, T. 6 S., R. 40 W.; drilled September 1949. Surface altitude, 3,620.0 feet.			Thickness, feet	Depth, feet
Quaternary--Pleistocene
	Sanborn formation--Peoria silt member
		Silt, dark-brown	4	4
		Silt, tan	28	32
Tertiary--Pliocene
	Ogallala formation
		Silt and clay, calcareous, cream-colored; contains fragments of "Algal limestone"; hard layer from 38 to 39 feet	12	44
		Gravel, fine to coarse, cemented	4	48
		Silt and very fine sand, brown	2	50
		Silt and very fine sand, brown; contains some medium to coarse sand and fine to coarse gravel	15	65
		Silt and very fine sand, compact, tan to brown; greenish from 78 to 82 feet	17	82
		Sand, fine to coarse; contains silt and very fine sand and a little gravel	8	90
		Sand, fine to coarse; contains a little silt and a little fine gravel	17	107
		Gravel, fine to coarse; contains some plastic brown silt and very fine sand	3	110
		Sand, fine to coarse; contains a small amount of fine gravel	8	118
		Silt and very fine sand, compact, brown; contains a small amount of fine to coarse gravel	12	130
		Sand, fine to coarse; contains some fine gravel	5	135
		Sand, fine to coarse; contains fine to coarse gravel	5	140
		Sand, fine to coarse, and fine to coarse gravel; a little finer from 145 to 150 feet	10	150
		Sand, medium to fine; contains a little coarse sand from 156 to 160 feet	15	165
		Sand, medium to fine, light-brown	7	172
		Sand, fine to coarse; contains a little fine to medium gravel	18	190
		Sand, fine to coarse; contains a little very fine sand and silt	10	200
		Silt and very fine sand, brown, compact	10	210
		Sandstone, fine	8	218
		Sand, fine to medium; contains white calcium carbonate cement; contains a little coarse sand and fine gravel from 218 to 220 feet	12	230
		Sand, fine to medium, cemented; contains white silt and very fine sand from 238 to 246 feet	16	246
		Silt and very fine sand, green	2	248
		Sand, fine to medium; partially cemented from 268 to 270 feet	22	270
		Sand, fine to medium	33	303
Cretaceous--Gulfian
	Pierre shale
		Shale, blue-black; contains a little greenish-gray clay at top	7	310

6-41-36ddd. Sample log of test hole in the SE cor. sec. 36, T. 6 S., R. 41 W.; drilled September 1949. Surface altitude, 3,723.4 feet.			Thickness, feet	Depth, feet
Quaternary--Pleistocene
	Sanborn formation--Peoria silt member
		Silt, dark-brown	4	4
		Silt, light-tan	33	37
Tertiary--Pliocene
	Ogallala formation
		Silt, sandy, light-tan	17	54
		Sand, coarse, and fine to coarse gravel; contains reddish-brown silt and clay	21	75
		Sand, coarse, and fine to medium gravel	10	85
		Gravel, fine to coarse	10	95
		Sand, coarse, and fine to coarse gravel; contains brown silt and clay	12	107
		Sand, fine to coarse, and fine gravel; partially cemented	6	113
		Silt, sandy, brown	18	131
		Sand, medium to coarse; contains much silt and very fine sand	9	140
		Sand, coarse, and fine to coarse gravel; contains silt and very fine sand	10	150
		Sand, medium to coarse	10	160
		Sand, coarse, and fine to medium gravel	10	170
		Mortar bed	21	191
		Sand, medium to coarse	10	201
		Mortar bed	56	257
		Sandstone, medium-grained	13	270
		Sand, fine to medium	56	326
		Sand, coarse, and fine gravel	4	330
Cretaceous--Gulfian
	Pierre shale
		Shale, yellowish-green	3	333
		Shale, dark-blue to black	7	340

6-42-2aaa. Sample log of test hole in the NE cor. sec. 2, T. 6 S., R. 42 W.; drilled September 1949. Surface altitude 3,784.7 feet; depth to water level September 17, 1949, 184.8 feet.			Thickness, feet	Depth, feet
Quaternary--Pleistocene
	Sanborn formation--Peoria silt member
		Silt, dark-brown	2	2
		Silt, tan	38	40
	Sanborn formation--Loveland silt member
		Silt, red-brown	4	44
Tertiary--Pliocene
	Ogallala formation
		Silt and clay, calcareous, cream-colored	11	55
		Sand, fine to coarse, with silt and clay binder	5	60
		Mortar bed	4	64
		Sand, fine to coarse, and fine to coarse gravel	6	70
		Sand, fine to coarse, and fine gravel	7	77
		Sand, medium to coarse, and fine to coarse gravel; contains compact brown clay and silt	3	80
		Sand, fine to coarse, reddish	6	86
		Sand, fine to coarse, and a little fine to coarse gravel	14	100
		Sand, fine to coarse, partly cemented	8	108
		Sand, fine to coarse, and fine to coarse gravel	6	114
		Silt and clay, gray to brown	6	120
		Sand, fine to coarse, with brown silt and very fine sand	13	133
		Sand, fine to coarse, and fine to coarse gravel; contains compact silt and very fine sand	7	140
		Sand, fine to coarse, and fine gravel; contains very fine sand and silt	7	147
		Sand, fine to coarse, and fine to coarse gravel	14	161
		Sand, fine to coarse	3	164
		Sand, fine to coarse, and fine to coarse gravel	6	170
		Sand, fine to coarse; contains silt and very fine sand	6	176
		Sand, fine to coarse, and fine to coarse gravel	8	184
		Sand, fine to coarse, partially cemented; contains a little fine to coarse gravel	5	189
		Mortar bed	18	207
		Sand, fine to medium, brown	7	214
		Mortar bed	4	218
		Sand, fine to coarse, and fine to coarse gravel, partially cemented	6	224
		Mortar bed	6	230
		Sand, fine to coarse, and fine gravel	10	240
		Sand, fine to coarse, and fine to coarse gravel; contains silt and very fine sand as binder	10	250
		Sand, fine to coarse, and fine to coarse gravel, partially cemented	10	260
		Sand, fine to coarse, and fine gravel;, contains a small amount of medium to coarse gravel	15	275
		Gravel, coarse to fine, and medium to coarse sand	5	280
		Sand, coarse to medium, and a small amount of fine gravel	6	286
		Gravel, coarse to fine, and coarse sand	2	288
Cretaceous--Gulfian
	Pierre shale
		Shale, clayey, yellow-brown to tan	12	300
		Shale, blue-black	6	306

6-42-31ddd. Sample log of test hole in the SE cor. sec. 31, T. 6 S., R. 42 W.; drilled September 1949. Surface altitude, 3,880.8 feet; depth to water level September 17, 1949, 171.3 feet.			Thickness, feet	Depth, feet
Quaternary--Pleistocene
	Sanborn formation--Peoria silt member
		Silt, black	2	2
		Silt, tan	24	26
		Silt, light-tan	7	33
Tertiary--Pliocene
	Ogallala formation
		Clay, calcareous, white; contains chips of "Algal limestone"; limestone layer from 36 to 37 feet	7	40
		Clay and caliche	4	44
		Sand, fine to coarse, and fine to coarse gravel	6	50
		Sand, fine to coarse; contains a little fine to coarse gravel; lower part contains silt and very fine sand as binder	10	60
		Sand, medium to coarse, and fine gravel; contains a little medium to coarse gravel	9	69
		Silt and very fine sand, brown	2	71
		Mortar bed	8	79
		Gravel, coarse	2	81
		Clay, silt, and very fine sand, gray	7	88
		Mortar bed	9	97
		Sand, medium to coarse, and fine to coarse gravel	3	100
		Gravel, coarse to fine, and coarse to medium sand	23	123
		Sand, fine to coarse, and fine to coarse gravel; finer than the preceding 23 feet	10	133
		Silt and very fine sand, brown; contains a little gravel	7	140
		Sand, fine to medium, brown	4	144
		Silt, and very fine to fine sand, brown	7	151
		Sand, fine to coarse; contains gray silt and gravel from 154 to 158 feet	13	164
		Sand, fine to coarse, and fine to coarse gravel; contains a little brown silt	11	175
		Sand, fine to coarse, brown	16	191
		Mortar bed	7	198
		Sand, fine to coarse, and fine to coarse gravel; cemented from 207 to 210 feet	12	210
		Mortar bed	6	216
		Sand, fine to coarse, brown; cemented with calcium carbonate	10	226
		Sand, fine to coarse, and fine to coarse gravel; contains brown silt and very fine sand binder	4	230
		Sand, fine to coarse, and fine gravel; contains brown silt and very fine sand binder	12	242
		Silt, and very fine to fine sand, compact	3	245
		Sand, fine to coarse, red-brown; contains a little fine gravel	22	267
		Sand, fine to coarse; contains a little fine gravel; cemented with calcium carbonate	2	269
		Sand, fine to medium, greenish	31	300
		Sand, fine to medium; contains a little coarse sand from 310 to 322 feet	22	322
Cretaceous--Gulfian
	Pierre shale
		Shale, weathered, yellow-brown	2	324
		Shale, blue-black	6	330

6-42-36ccc. Sample log of test hole in the SW cor. sec. 36, T. 6 S., R. 42 W., drilled September 1949. Surface altitude, 3,791.1 feet.			Thickness, feet	Depth, feet
Quaternary--Pleistocene
	Sanborn formation--Peoria silt member
		Silt, black	1	1
		Silt, tan	34	35
		Silt and very fine sand, tan	1	36
Tertiary--Pliocene
	Ogallala formation
		Silt, calcareous, light-tan	18	54
		Sand, coarse, and fine to coarse gravel	6	60
		Gravel, coarse to fine, and a little coarse sand	11	71
		Gravel, fine to coarse, and medium to coarse sand	21	92
		Silt and very fine sand, compact, brown	5	97
		Sand, fine to coarse, and fine to coarse gravel; contains brown silt and very fine sand	3	100
		Silt, clay, and very fine sand, light-brown; cream-colored from 120 to 123 feet	23	123
		Sand, fine to coarse, and fine to coarse gravel	20 143
		Sand, very fine to coarse; contains a little brown silt	9	152
		Sand, very fine to medium, partially cemented; contains silt and clay	6	158
		Mortar bed	2	160
		Sand, fine to medium, with white silt and very fine sand binder	12	172
		Sand, fine to medium; contains silt, very fine sand, and a small amount of coarse gravel	3	175
		Silt and very fine to fine sand, brown	13	188
		Sand, fine to medium, brown	5	193
		Mortar bed	25	218
		Sand, very fine to coarse	6	224
		Sand, very fine to coarse; contains calcium carbonate cement	6	230
		Sand, very fine to medium	20	250
		Sand, very fine to medium; contains a little coarse sand	28	278
		Clay, yellow-green	8	286
		Sand, very fine to coarse	2	288
Cretaceous--Gulfian
	Pierre shale
		Clay, yellowish-green	2	290
		Clay, yellow	4	294
		Shale, blue-black	6	300

7-37-1aaa. Sample log of test hole in the NE cor. sec. 1, T. 7 S., R. 37 W.; drilled September 1943. Surface altitude, 3,417.5 feet; depth to water level October 194~3, 140.0 feet.			Thickness, feet	Depth, feet
Quaternary--Pleistocene
	Sanborn formation
		Soil, dark gray-brown	4	4
		Silt, soft, yellow-gray; contains some very fine sand	33	37
		Silt, partly clayey, compact, light brown-gray and light-buff; contains a little fine sand; contains a little coarse sand near 50 feet	13	50
		Silt, clayey, cream and light-buff; contains a little caliche and fine to medium gravel	10	60
		Silt, white to tan; contains much caliche, a little fine gravel, and fine to coarse sand	7	67
Tertiary--Pliocene
	Ogallala formation
		Gravel, coarse to fine, cemented	3	70
		Gravel, coarse to fine, and sand; contains a little caliche	3	73
		Silt, greenish-gray downward to buff; contains some medium to fine gravel, coarse to fine sand, and a little caliche	15	88
		Gravel, coarse to fine, and sand; contains a little light-buff silt; contains caliche from 97 to 98 feet	12	100
		Gravel, medium to fine, and sand; contains some coarse gravel	7	107
		Silt, buff and white; contains much fine gravel, coarse to fine sand, and caliche	23	130
		Gravel, fine, and sand, partly cemented by caliche	6	136
		Silt, gray-green and buff; contains some coarse to fine sand and a little caliche	4	140
		Silt, soft, light brown-green and gray; contains a little caliche and a little coarse to fine sand	13	153
		Gravel, fine, and sand; contains a little caliche	4.5	157.5
		Silt, soft, light green-gray and light-brown; contains a little caliche	1.5	159
		Gravel, coarse to fine, and sand; mostly firmly cemented	11	170
		Gravel, medium to fine, and sand; contains some caliche	7	177
		Silt, light-gray and tan; contains much coarse to fine sand and caliche and some fine to medium gravel	13	190
		Silt, buff and white, and caliche; contains some fine to medium sand	6	196
		Gravel, medium to fine, and sand	4	200
		Sand, coarse to fine, buff silt, and caliche	7	207
		Gravel, medium to fine, and sand; contains much gray and buff silt and a little caliche	15	222
		Silt, yellow-gray, and caliche	4	226
		Sand, coarse to fine; contains a little fine gravel and caliche	24	250
		Sand, coarse to fine; contains some medium to fine gravel and silt; light gray-green	13	263
		Clay, light gray-green and white; contains some medium to fine sand and some caliche	9	272
		Gravel, fine, and sand; light-gray	9	281
		Silt, light gray-green; contains much medium to fine sand	3	284
		Gravel, fine, and sand; light-gray	6	290
		Gravel, medium to fine, and sand; gray	8	298
Cretaceous--Gulfian
	Pierre shale
		Shale, clayey, light blue-gray and yellow	2	300
		Shale, dark-gray and light-green	10	310

7-37-5bbb. Sample log of test hole in the NW cor. sec. 5, T. 7 S., R. 3 7 W.; drilled August 1949. Surface altitude, 3,465.7 feet.			Thickness, feet	Depth, feet
Quaternary--Pleistocene
	Sanborn formation--Peoria silt member
		Silt, black	5	5
		Silt, tan	33	38
Tertiary--Pliocene
	Ogallala formation
		Clay, calcareous, light-tan	7	45
		Silt and fine sand, brown to light-tan	12	57
		Sand, medium to coarse, and fine to coarse gravel	3	60
		Sand, fine to coarse, and fine gravel; contains some medium to coarse gravel	12	72
		Sand, medium to coarse, and fine to coarse gravel; contains clay layer from 75 to 76 feet	6	78
		Sand, medium to coarse, and fine to coarse gravel; contains brown silt and fine sand	13	91
		Sand, medium to coarse, and fine to coarse gravel; contains little silt and clay	11	102
		Mortar bed	11	113
		Silt and fine sand, gray	6	119
		Sand, medium to coarse, and fine to coarse gravel; contains brown silt and fine sand from 138 to 141 feet	22	141
		Mortar bed, poorly cemented	9	150
		Sand, medium to coarse, and fine to medium gravel	6	156
		Sand, medium to coarse, and fine to medium gravel; contains much brown plastic silt and fine sand. . . .	4	160
		Sand, fine to coarse; contains some silt and clay	15	175
		Sand, medium to coarse, and fine to coarse gravel; contains some silt and clay	5	180
		Sand, fine to coarse; contains clay and silt and some gravel at the base	10	190
		Sand, medium to coarse	9	199
		Sand, medium to coarse; contains some cemented layers and a little gravel	16	215
		Sand, medium to coarse, partially cemented; contains silt and clay	10	225
		Silt and clay, sandy, brown	4	229
		Sand, fine to medium; contains some silt and clay from 240 to 250 feet	21	250
		Sand, fine to medium; contains greenish-clay and a little fine to medium gravel	20	270
		Sand, fine to coarse; contains some fine gravel	11	281
Cretaceous--Gulfian
	Pierre shale
		Shale, weathered, light-green to yellow-brown	4	285
		Shale, blue-black	5	290

7-39-20bad. Driller's log of irrigation well in the SE NE NW sec. 20, T. 7 S., R. 89 W.; drilled by Reddig and Hubalek, 1940. Surface altitude, 3,531.8 feet.			Thickness, feet	Depth, feet
Quaternary--Pleistocene
	Sanborn formation
		Soil	25	25
Tertiary--Pliocene
	Ogallala formation
		Sand and gravel	57	82
		Rock	1	83
		Gravel, large, and clay	7	90
		Clay, sand, and rock	35	125
		Gravel, excellent	17	142

7-40-36ddd. Sample log of test hole in the SE cor. sec. 36, T. 7 S., R. 40 W.; drilled August 1949. Surface altitude, 3,647.9 feet; depth to water level, August 20, 1949, 111.60 feet.			Thickness, feet	Depth, feet
Quaternary--Pleistocene
	Sanborn formation--Peoria silt member
		Silt, dark-brown	6	6
		Silt, tan	28	34
		Silt, light reddish-brown	8	42
Tertiary--Pliocene
	Ogallala formation
		Clay and silt, calcareous, cream to light-brown; contains a little sand	8	50
		Sand, fine to medium, partially cemented, reddish	7	57
		Mortar bed	13	70
		Sand, fine to coarse, and fine gravel; partially cemented at base	10	80
		Sand, fine to coarse, partially cemented	20	100
		Sand, fine to coarse, and fine gravel	20	120
		Clay, calcareous, cream-colored	5	125
		Sand, medium to coarse, and fine to medium gravel; contains silt and clay	15	140
		Sand, medium to coarse, and fine to medium gravel; contains some coarse gravel, silt, and clay	19	159
		Gravel, coarse	6	165
		Gravel, fine to coarse, and medium to coarse sand	15	180
		Sand, fine to coarse, and fine gravel; contains brown silt and very fine sand	10	190
		Sand, very fine to coarse, with some silt	10	200
		Sand, fine to coarse; contains some fine gravel	10	210
		Sand, fine to coarse; contains fine to coarse gravel and some cemented layers	15	225
		Sand, fine to coarse; contains a little very fine sand and silt; contains a little yellowish clay from 246 to 250 feet	41	266
		Sand, fine to coarse; contains a little gravel and clay	4	270
		Sand, fine to coarse; contains silt and a little clay	12	282
		Mortar bed; contains much calcium carbonate cement,	8	290
		Sand, fine to coarse; contains fine gravel from 320 to 338 feet	48	338
Cretaceous--Gulfian
	Pierre shale
		Shale, blue-black	7	345

8-37-6aaa. Sample log of test hole in the NE cor. sec. 6, T. 8 S., R. 37 W.; drilled August 1949. Surface altitude, 3,503.2 feet.			Thickness, feet	Depth, feet
Quaternary--Pleistocene
	Sanborn formation--Peoria silt member
		Silt, dark-brown	3	3
		Silt, tan	24	27
Tertiary--Pliocene
	Ogallala formation
		Silt and clay, sandy	3	30
		Silt and clay; contains much sand and gravel	9	39
		Sand, coarse, and fine to coarse gravel; contains clay layer from 46 to 48 feet	18	57
		Gravel, coarse; contains brown plastic silt and clay	11	68
		Silt and clay, plastic, brown; contains much fine sand; contains gravel from 80 to 85 feet	17	85
		Sand, medium to coarse, and fine to medium gravel	9	94
		Clay, silt, and fine sand; contains medium to coarse sand and fine to coarse gravel	13	107
		Gravel, fine to coarse, and medium to coarse sand	23	130
		Gravel, fine to coarse, and medium to coarse sand; contains brown plastic silt and fine sand	10	140
		Sand, medium to coarse, and fine to coarse gravel	5	145
		Silt, fine sand, and clay; plastic, light-tan to brown; contains much fine to medium sand from 150 to 162 feet	7	162
		Sand, fine to medium; contains much silt and clay	7	169
		Sand, fine to medium, compact	9	178
		Sand, fine to medium; contains a little clay and gravel,	3	181
		Mortar bed	17	198
		Sand, medium to coarse, and fine to medium gravel; contains a little coarse gravel	4	202
		Sand, medium to coarse, and fine to coarse gravel, partially cemented	6	208
		Clay, yellow	4	212
		Sand, medium to coarse, and fine to medium gravel; contains streaks of yellow clay	8	220
		Sand, medium to coarse, and fine to medium gravel; contains a little coarse gravel	20	240
		Sand, medium to coarse, and fine to coarse gravel.	8	248
Cretaceous--Gulfian
	Pierre shale
		Clay, yellow-brown	4	252
		Shale, sticky, light-gray	4	256
		Shale, dark blue-black	4	260

8-37-31dcc. Driller's log of irrigation test hole in SW cor. SE sec. 31, T. 8 S., R. 37 W.; drilled by A. J. Foust, 1949. Surface altitude, 3,519.3 feet.			Thickness, feet	Depth, feet
Quaternary--Pleistocene
	Sanborn formation
		Surface soil and clay	50	50
Tertiary--Pliocene
	Ogallala formation
		Gravel and sand	13	63
		Clay, sandy	20	83
		Sand and gravel	16	99
		Pack sand	7	106
		Clay, sandy	3	109
		Sand, fine	7	116
		Rock, white	2	118
		Sand, fine	6	124
		Clay, sandy, red	7	131
		Sand and gravel	5	136
		Clay, sandy, red and white	7	143
		Gravel and sand, heavy	6	149
		Sand rock	2	151
		Sand and gravel, with heavy clay	9	160
		Pack sand, with shells and rock	21	181
Cretaceous--Gulfian
	Pierre shale
		Soapstone	1	182

8-38-26aba. Driller's log of irrigation well in the NE NW NE sec. 26, T. 8 S., R. 38 W.; drilled by A. J. Foust, 1948. Surface altitude, 3,552.8 feet.			Thickness, feet	Depth, feet
Quaternary--Pleistocene
	Sanborn formation
		Surface soil	38	38
Tertiary--Pliocene
	Ogallala formation
		Clay	19	57
		Sand and gravel, heavy	5	62
		Clay, red	11	73
		Clay, sandy; 1 foot thick shell rock at 82 feet	11.5	84.5
		Gravel and sand, heavy, sandy, red	4.5	89
		Clay, sticky	2	91
		Clay, firm, white	7	98
		Clay, sandy, red, carrying shell rocks	28	126
		Sand and gravel	5	131
		Clay, sandy	1	132
		Sand and gravel, heavy	10.5	142.5
		Clay, sandy	16.5	159
		Gravel and sand	7	166
		Clay, sandy	20	186
		Sand, fine, red	3	189
		Clay, sandy	44	233
		Sand	4	237
Cretaceous--Gulfian
	Pierre shale
		Soapstone	1.5	238.5
		Shale	1.5	240

8-38-28acc. Driller's log of irrigation well in the SW cor. NE sec. 28, T. 8 S., R. 38 W.; drilled by A. J. Foust, 1949. Surface altitude, 3,586.6 feet.			Thickness, feet	Depth, feet
Quaternary--Pleistocene
	Sanborn formation
		Surface soil and clay	66	66
Tertiary--Pliocene
	Ogallala formation
		Sand and gravel	12	78
		Clay, sandy	4	82
		Gravel, heavy	11	93
		Clay, sandy	4	97
		Sand and gravel	4	101
		Clay, sandy	9	110
		Gravel, heavy	16	126
		Clay, sandy, red	5	131
		Gravel, heavy	5	136
		Clay, red	9	145
		Gravel, heavy	14	159
		Sand rock and clay	14	173
		Gravel, heavy	11	184
		Clay, sandy	9	193
		Gravel, heavy	14	207
		Rock, sandy, soft	3	210
		Gravel, medium	4	214
		Clay, white	1	215
		Rock, hard	3	218
		Clay, sandy	2	220
		Rock, hard	9	229
		Clay, sandy	2	231
Cretaceous--Gulfian
	Pierre shale
		Soapstone	4	235

8-39-1aaa. Sample log of test hole in the NE cor. sec. 1, T. 8 S., R. 39 W.; drilled August 1949. Surface altitude, 3,588.2 feet.			Thickness, feet	Depth, feet
Quaternary--Pleistocene
	Sanborn formation--Peoria silt member
		Silt, black	2	2
		Silt, sandy, tan	26	28
Tertiary--Pliocene
	Ogallala formation
		Clay, sandy, calcareous	2	30
		Limestone, white to cream; "Algal limestone" at top,	8	38
		Silt and clay, calcareous, brown to cream	4	42
		Caliche, sandy, red-brown	4	46
		Mortar bed	4	50
		Sand, medium to coarse, and fine to coarse gravel; contains a little silt and clay	19	69
		Sand, fine to coarse, and fine to coarse gravel; partially cemented	11	80
		Sand, fine to coarse; contains some coarse to fine gravel and silt; partially cemented from 92 to 94 feet	14	94
		Gravel, fine to coarse	10	104
		Gravel, fine to coarse; contains medium to coarse sand	20	124
		Silt and fine sand, plastic, brown	6	130
		Mortar bed	8	138
		Sand, fine to coarse, brown	4	142
		Sand, fine to coarse, partially cemented	9	151
		Sand, fine to coarse, and fine to coarse gravel	9	160
		Sand, fine to coarse; contains a little fine to coarse gravel and silt and clay binder	10	170
		Sand, fine to coarse; contains silt and clay; cemented from 205 to 210 feet	55	225
		Sand, fine to coarse; contains a little fine to coarse gravel	3	228
		Sand, fine to coarse; contains much white silt and clay,	2	230
		Sand, fine to coarse; contains a little fine gravel	8	238
		Gravel, fine to coarse, and fine to coarse sand, partially cemented	2	240
		Mortar bed, well cemented	10	250
		Sand, fine to coarse; contains fine gravel from 280 to 290 feet	40	290
		Sand, fine to coarse; contains fine to medium gravel	5	295
Cretaceous--Gulfian
	Pierre shale
		Clay, yellow-brown	2	297
		Shale, blue-black	3	300

8-39-15ccc. Driller's log of irrigation well in the SW cor. sec. 15, T. 8 S., R. 39 W.; drilled by C. A. Robben. Surface altitude, 3,640.9 feet.			Thickness, feet	Depth, feet
Quaternary--Pleistocene
	Sanborn formation
		Soil	40	40
Tertiary--Pliocene
	Ogallala formation
		Gravel	21	61
		Clay, light	5	66
		Rock	1	67
		Molding sand	10	77