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Logs of Wells and Test Holes

The following are logs of 95 test holes drilled in Grant and Stanton counties. Sixty-nine of these test holes were drilled by the State and Federal Geological Surveys and are headed "Sample log of test hole in . . . "

These tests were logged by the authors during drilling and supplemented by studying the formation samples. Twenty-six of the test holes were drilled by commercial well drillers for individual land owners, and formation samples were collected; these are headed "Sample logs of test holes drilled by . . . " These 26 test holes were logged by the personnel of the Geological Survey from the formation samples and the descriptions may differ somewhat from that of the drillers.

In addition, 342 test holes drilled and logged by commercial well drillers are summarized in Table 19 and Table 20. An asterisk after the well number in Tables 19 and 20 indicates that a descriptive log is also included in this report, and an "e" after the altitude means that the altitude was estimated. Table 2 presents similar information from electrical and radioactivity logs.

Grant County

27-35-4bbb--Sample log of test hole drilled in NW NW sec. 4, T. 27 S., R. 35 W., 20 feet south and 20 feet east of NW cor. sec. 4; January 15, 1959; altitude of land surface, 3,060 feet.				Thickness, feet	Depth, feet
Neogene
	Undifferentiated Pleistocene
			Silt, sandy	20	20
			Sand, fine to medium, silty; contains coarse grains	50	70
			Sand, medium to very coarse, silty	10	80
			Sand, very coarse, and fine gravel	13	93
			Gravel, fine to coarse, and very coarse sand	49	142
			Sand, fine to medium, silty	47	187
			Silt, sandy, brown	9	196
			Sand, fine to coarse, silty, and fine gravel	52	248
			Sand, fine to coarse, silty; contains thin brown clay layers, 25	273
			Sand, fine to coarse, and fine gravel	26	323
			Clay, silty, brown	7	330
			Sand, fine to coarse, and fine gravel	8	338
			Silt, sandy, brown	5	343
			Sand, fine to coarse, and fine gravel	19	362
	Pliocene
		Ogallala Formation
			Silt, clayey, tan-buff	2	364
			Sand, fine to coarse	3	367
			Sand, fine to medium; contains some coarse grains	13	380
			Sand, fine to medium, and fine gravel; contains thin brown silt layers	17+	397

27-36-1bba--Sample log of test hole drilled by Mobil Oil Co. for shot hole test in NE NW NW sec. 1, T. 27 S., R. 36 W., 0.22 mile east and 35 feet south of NW cor. sec. 1; February 5, 1960; altitude of land surface, 3,079 feet.				Thickness, feet	Depth, feet
Neogene
	Undifferentiated Pleistocene
			Topsoil	3	3
			Sand, fine to medium, silty, brown	12	15
			Sand, fine to coarse	15	31
			Sand, fine to medium; contains thin silt beds	15	46
			Sand, medium to coarse, brown	16	62
			Sand, silty, brown	10	72
			Sand, medium to coarse; contains fine gravel	5	77
			Clay, silty, yellow	5	82
			Sand, coarse; contains fine gravel	5	87
			Sand, medium to coarse; contains pea gravel	21	108
			Gravel, course; contains very coarse sand	20	128
			Sand, coarse; contains fine to medium gravel	26	154
			Clay	3	157
			Clay, silty, tan; contains fine sand strips	10	167
			Sand, medium to coarse; contains fine gravel and thin tan clay strips	10	177
			Gravel, fine to medium; contains coarse sand	13	190
			Clay, silty, yellow; contains beds of medium gravel and coarse sand	16	206
			Gravel, fine to medium, and coarse sand	8	214
			Clay, blue-gray	33	247
			Sand, medium to coarse	8	255
			Clay, blue-gray	8	263
			Sand, coarse to medium	5	268
			Clay, blue-gray	2	270
			Sand, fine to medium; with a few blue clay layers	10	280
			Clay, blue; with thin fine sand layers	15	295
			Clay, blue-gray	10	305
			Clay, tan; interbedded blue-gray clay	2	307
			Sand, fine to medium	4	311
			Clay, taii; interbedded blue-gray clay layers and thin fine sand layers	8	319
			Sand, medium to coarse, and fine gravel; interbedded gray and tan silt	53	372
	Pliocene
		Ogallala Formation
			Sand, fine to medium; with thin tan clay layers	12	384
			Sand, coarse to medium	10	394
			Clay, tan-gray	9+	403

27-37-26ca--Sample log of test hole drilled for Mobil Oil Co. in NE SW sec. 26, T. 27 S., R. 37 W., about 650 feet south and 650 feet west of center of sec. 26; 1959; altitude of land surface, 3,069 feet.				Thickness, feet	Depth, feet
Neogene
	Undifferentiated Pleistocene
			Topsoil and tan silt	15	15
			Clay and silt, brown	30	45
			Clay, sandy, brown	15	60
			Silt, sandy, brown	13	73
			Sand, fine, brown	7	80
			Clay, hard, tan	25	105
			Silt, tan, and gray clay strips	15	120
			Silt, tan, and very fine sand	10	130
			Silt, tan, and fine sand strips	20	150
			Sand, very fine, silty, tan; contains a few thin brown clay strips	38	188
			Sand, very fine, silty, gray	15	203
			Sand, very fine, tan	17	220
			Sand, fine, and caliche	15	235
			Sand and fine gravel; contains caliche strips	15	250
			Gravel	17	267
	Pliocene
		Ogallala Formation
			Clay and caliche	8	275
			Sand, coarse	5	280
			Sand and fine gravel	7	292
			Clay and caliche	23+	315

27-37-34ccc--Sample log of test hole drilled in SW SW sec. 34, T. 27 S., R. 37 W. at SW cor. sec. 34; 1942; allitude of land surface, 3,063 feet.				Thickness, feet	Depth, feet
	Undifferentiated Pleistocene
			Soil, compact, silty, sandy, tan and brown	1	1
			Silt, compact, sandy, gray and brown; contains caliche	9	10
			Sand, fine, silty, brown	3	13
			Silt and fine sand, brown; contains caliche	5	18
			Silt, tan; contains caliche and sand layers	19	37
			Sand, coarse	3	40
			Clay, compact, tan; contains silt and fine sand	10	50
			Silt and clay, compact, sandy, tan	20	70
			Silt, sandy, gray and green	10	80
			Sand, very fine; contains brown silt	20	100
			Silt, sandy, tan; contains caliche	10	110
			Clay, gray; and brown, fine sand	10	120
			Sand, fine, silty, tan	10	130
			Silt, sandy, brown	10	140
			Sand, very fine, silty, tan	20	160
			Sand, very fine, silty, tan; contains clay layers	15	175
			Sand, fine to medium; contains clay strips	15	190
			Silt, very sandy, and gray clay	10	200
	Pliocene
		Ogallala Formation
			Sand, fine, silty, tan	13	213
			Sand, fine to coarse, brown	7	220
			Silt and fine sand; contains caliche	10	230
			Sand, coarse, brown	8	238
			Sand and fine gravel	27	265
			Gravel, fine to coarse, sandy; contains brown silt	5	270
			Silt, sandy, yellow; contains caliche	15	285
			Clay and silt; contains weathered fragments of sandstone	15+	300

27-38-15dad--Sample log of test hole drilled in SE NE SE sec. 15, T. 27 S., R. 38 W., 0.3 mile north and 25 feet west of SE cor. sec. 15; September 25, 1959, altitude of land surface 3,101 feet.				Thickness, feet	Depth, feet
Neogene
	Undifferentiated Pleistocene
			Silt, gray-brown	10	10
			Silt, gray-brown, and fine to medium sand	10	20
			Silt, brown-gray, and fine sand	10	30
			Silt, clayey, tan, and fine sand	30	60
			Sand, fine to medium, silty	52	112
			Clay, tan; interbedded with buff, sandy silt	20	132
			Sand, fine to medium, silty, tan	5	137
			Silt, clayey, blue-gray	25	162
			Sand, medium to coarse	21	183
			Caliche	3	186
			Silt, sandy, brown	8	194
			Sand, medium to very coarse, and fine to medium gravel	27	221
	Pliocene
		Ogallala Formation
			Silt, clayey, brown	9	230
			Sand, fine to medium; contains caliche	10	240
			Silt, clayey, brown	13	253
			Sand, fine to coarse	29	282
			Clay, silty, tan	13	295
			Silt, clayey, tan; contains thin layers of silty sand and caliche	78	373
Cretaceous
	Lower Cretaceous
		Dakota Formation [Lower (?) Cretaceous]
			Sandstone, brown to yellow, and brown shale	48	411
			Sandstone, red-brown; contains thin layers of dark-brown shale	26	447
			Shale, brown-red	3	450
			Sandstone, brownish-red to gray	13	463
		Kiowa Shale
			Shale, hard, blue	12+	475

27-38-19db--Sample log of test hole drilled by Juel Water Well Drilling Co. for L. E. Annis in NW SE sec. 19, T. 27 S., R. 38 W., 0.26 mile north of S 1/4 cor. sec. 19; November 11, 1958; altitude of land surface, 3,134 feet.				Thickness, feet	Depth, feet
Neogene
	Undifferentiated Pleistocene
			Sand, fine to meduim, silty, dark-gray	10	10
			Sand, fine to coarse; some light-gray silt	10	20
			Sand, very coarse, and fine gravel	40	60
			Gravel, fine to medium, and very coarse sand	30	90
			Sand, very coarse, and fine to very fine gravel	10	100
			Silt, sandy, gray-brown; caliche-cemented	20	120
			Sand, fine to coarse, and buff-tan silt	32	152
			Sand, medium to coarse, and fine to medium gravel	13	165
			Silt, sandy, brown	4	169
			Sand, fine to coarse, silty, tan	10	179
			Sand, fine to medium; with silt; caliche-cemented	16	195
			Sand, very coarse to medium, and fine gravel; with some caliche-cemented beds	37	232
			Sand, medium to coarse, interbedded with brown-tan silt	16	248
	Pliocene
		Ogallala Formation
			Sand, fine, silty, buff-tan	20	268
			Silt, very sandy, buff-tan; caliche-cemented	15	283
			Sand, fine to medium; some coarse quartz grains, and buff-tan silt; some caliche-cemented layers	34	317
			Silt, buff--tan, and fine to medium sand	11	328
			Sand, fine to medium, and buff-tan silt	13	342
Cretaceous
	Lower (?) Cretaceous
		Dakota Formation
			Shale, gray to yellow-brown; fine-grained sandstone, iron cemented	28+	360

27-38-25aaa--Sample log of test hole drilled in NE NE sec. 25, T. 27 S. R. 38 W., 25 feet west and 40 feet south of NE cor. sec. 25; September 16, 1959; altitude of land surface, 3,084 feet.				Thickness, feet	Depth, feet
Neogene
	Undifferentiated Pleistocene
			Silt, gray	10	10
			Sand, brown	5	15
			Sand, brown, and silt	5	20
			Silt, brown	60	80
			Silt, sandy, light-brown, and caliche	10	90
			Silt, sandy, brown and gray	20	110
			Silt, gray and brown	20	130
			Silt, brown	10	140
			Silt, brown, and very fine sand	10	150
			Silt, blue and brown	20	170
			Silt, hard, brown, and fine sand	17	187
			Sand, fine	3	190
			Sand, fine to coarse	10	200
			Sand, fine to coarse, and brown silt	10	210
			Sand, fine; contains a little brown clay	10	220
	Pliocene
		Ogallala Formation
			Gravel, fine	10	230
			Sand and gravel	55	285
			Silt, pink	2	287
			Sand	3	290
			Sand and gravel	8	298
			Caliche, hard	12	310
			Silt, hard, brown and gray	27	337
			Clay, red	1	338
			Silt, bard, brown and gray	12	350
			Silt, hard, brown; and some ironstone and sandstone chips	30	380
			Silt, hard, brown, and ironstone chips	21	401
Cretaceous
	Lower Cretaceous
		Dakota Formation [Lower (?) Cretaceous]
			Sandstone, hard, dark-brown	3	404
			Shale, hard, brown and green streaks	11	415
			Sandstone, hard, brown	1	416
			Shale, brown	7	423
			Sandstone, gray-brown	2	425
			Shale, sticky, tan	2	427
			Shale, hard, tan	2	429
			Shale, very hard, tan	0.5	429.5
			Shale, hard, black and brown	10.5	440
			Shale, hard, brown and blue	16	456
			Shale, sticky	1	457
			Shale, hard, blue and brown streaks	8	465
		Kiowa Shale
			Shale, hard, dry, brown, blue, and white	2	467
			Shale, hard, dry, brownish-yellow	8	475
			Shale, soft, brown and blue streaks	8	483
			Shale, hard, blue	5	488
			Sandstone and shale streaks, hard	6	494
			Sandstone, fine to coarse, friable	4	498
			Shale, hard, blue	10	508
			Shale, soft, blue	2	510
			Shale, soft, sticky, blue	20	530
		Cheyenne Sandstone
			Sandstone, fine-grained, soft, white	20	550
			Sandstone, fine-grained, granular, friable, limonitic, tan	10+	560

27-38-32ddd--Sample log of test hole drilled in SE SE SE sec. 32, T. 27 S., R. 38 W., SE cor. sec. 32; 1942; altitude of land surface, 3,121 feet.				Thickness, feet	Depth, feet
Neogene
	Undifferentiated Pleistocene
			Soil, silty, gray	1	1
			Silt, sand, buff; containing gravel, sand, and clay	13	14
			Clay, silty, compact, buff to tan	6	20
			Silt, fine, sandy, buff to tan	13	33
			Silt, sand, and gravel; poorly sorted; oray to gray-green, tan, and buff	33	66
			Silt, sandy, gray to brown, containing caliche	4	70
			Silt, sandy, gray and white, containing fine gravel	7	77
			Silt, sandy, compact, buff, containing a little caliche	33	110
			Sand and gravel, fine to coarse, light gray to buff, containing silt	30	140
			Silt, fine, sandy, buff to gray, containing gravel and a little clay	40	180
			Silt, compact, dark-tan to brown, containing fragments of charcoal	10	190
			Gravel, fine to coarse; containing buff to brown silt and fine sand	40	230
			Silt, buff to tan, and fine gravel, containing sand	24	254
	Pliocene
		Ogallala Formation
			Clay, compact, blocky, dark-tan to brown; contains silt and tan, and charcoal	28	282
			Silt, sandy to clayey, compact, dark tan, containing caliche	2	290
			Silt, white to buff, and medium to coarse gravel; contains sand, caliche, and clay	10	300
			Sand, fine to very fine, semiconsolidated, red-brown to yellow; contains much silt and clay	10	310
			Clay, in part sand, dark-tan to brown and red; contains fragments of yellow-brown sandstone and ironstone	30	340
			Sand, fine to coarse, partially cemented, yellow-brown to dark rusty brown; contains a little silt and clay	10	350
			Clay, silty, compact, gray to tan, contains fragments of fine sandstone and ironstone	10	360
			Clay, silty, yellow; contains a few fine sandstone fragments	10	370
Cretaceous
	Lower Cretaceous
		Kiowa Shale
			Shale, silty, soft, dark-brown	15	385
			Shale, sandy, soft, gray	15	400
			Shale, clayey, fissile, soft, gray to dark-gray, containing fragments of pyrite and charcoal	50	450
			Shale, fine sandy, gray	30	480
			Shale, fissile, soft, dark-gray to black, containing streaks of white sandstone	22.5	502.5
			Shale, clayey to fine sandy, soft, light-gray and gray	7.5	510
			Shale, clayey, dark-gray to black	10	520
		Cheyenne Sandstone
			Sandstone, fine to coarse, friable	10	530
			Sandstone, fine, friable, white	33	563
			Shale, clayey, soft, light-gray and light-green	7	570
			Sandstone, fine, friable, white	20	590
Triassic
	Upper Triassic
		Dockum Group
			Sandstone, very fine, hard, white	1.5	591.5
			Shale, silty to clayey, soft, light-gray and green, containing streaks of hard sandstone	6.5	598
			Siltstone, soft, red	2+	600

28-35-10bbd--Sample log of test hole drilled by Juel Water Well Drilling Co. for C. L. Dew in NW NW sec. 10, T. 28 S., R. 35 W., 0.2 mile south and 0.2 mile east of NW cor. sec. 10; September 1959; altitude of land surface, 3,102 feet.				Thickness, feet	Depth, feet
Neogene
	Undifferentiated Pleistocene
			Topsoil and gray silt	10	10
			Silt, brown, and caliche	10	20
			Silt, light grayish-brown	10	30
			Silt, caliche and coarse sand	20	50
			Silt, brown and gray	20	70
			Sand, fine to medium	10	80
			Sand, fine to coarse	30	110
			Sand and fine gravel	10	120
			Sand, coarse	18	138
			Clay, silty, brown	10	148
			Sand, coarse, and fine gravel	16	164
			Sand, fine, and brown silt	5	169
			Clay, brown	9	178
			Sand, medium to coarse	14	192
			Clay, silty, brown	5	197
			Sand, medium, silty, brown-tan	38	235
			Clay, silty, brown	20	255
			Sand, medium to coarse, and fine gravel	30	285
			Clay, hard, brown	13	298
			Clay, silty, brown	47	345
			Sand, fine, brown	10	355
	Pliocene
		Ogallala Formation
			Clay, silty, sandy, brown, containing fine sand strips	53	408
			Clay, hard, silty, brown	37	445
			Clay and light-gray silt strips	10	455
			Clay, sandy, silty, containing fine to coarse sand strips	55	510
			Clay, hard, silty, brown, containing fine sand strips	85	595
Cretaceous
	Lower Cretaceous
		Kiowa Shale
			Shale, hard, blue-gray	39	634
		Cheyenne Sandstone
			Sandstone and shale, hard (Drilled for 1/2 hour at 648 feet; fishtail bit would not penetrate.)	14+	648

28-35-27bb--Sample log of test hole drilled by Juel Water Well Drilling Co. for Rolla Ulsh in NW NW sec. 27, T. 28 S., R. 35 W., 95 feet south and 100 feet east of NW cor. sec. 27; November 13, 1958; altitude of land surface, 3,041 feet.				Thickness, feet	Depth, feet
Neogene
	Undifferentiated Pleistocene
			Silt, gray, fine sand, and white caliche	13	13
			Silt, brown, fine sand, and white caliche	10	23
			Sand, fine to medium, reddish-brown	10	33
			Sand, medium to coarse	1 10	43
			Sand, medium to coarse, and fine gravel	10	53
			Sand, medium to coarse, and fine to medium gravel	10	63
			Sand, fine to coarse	10	7
			Sand, fine to coarse, and fine to medium gravel	10	83
			Sand, medium to coarse, and fine to medium gravel	10	93
			Sand, medium to coarse, and fine to coarse gravel	20	113
			Sand, medium to coarse, and fine gravel	10	123
			Silt, sandy, brownish-gray	10	133
			Sand, fine, and gray to brown silty clay	10	143
			Clay, silty, gray to brown, and brown silt	5	148
			Sand, very coarse, and fine gravel	15	163
			Clay, silty, gray to brown, and brown silt	10	173
			Silt, sandy, brown	10	183
			Silt, sandy, brown, and gray to brown clay	10	193
			Sand, fine to coarse	11	204
			Gravel, very coarse	13	217
			Silt, sandy, brown	6	223
			Sand, coarse, and fine to medium gravel	20	243
			Clay, gray to limonite-brown	9	252
			Gravel, coarse to very coarse, quartz and red granite pebbles	21	273
			Clay, gray to brown, and fine sand	10	283
			Sand, medium to coarse, caliche-cemented	10	293
			Sand, fine to coarse	10	303
			Sand, very coarse, and fine gravel	17	320
	Pliocene
		Ogallala Formation
			Clay, silty, brown	18	338
			Sand, coarse, and fine to coarse gravel	6	344
			Clay, sandy, dark-brown to gray	9	353
			Clay, brown, greenish-gray to light-gray, and very fine sand	10	363
			Sand, fine to medium, and caliche	30	393
			Clay, brown to gray; contains sandstone fragments	10	403
			Sand, fine,loose	10	413
			Clay, sandy, dark-brown	10	423
			Clay, dark-brown to gray, containing sandstone fragments	20	443
			Sand, fine to medium, loose	10	4-33

28-36-2bbb--Sample log of test hole drilled in NW NW sec. 2, T. 28 S., R. 36 W.; 1942; altitude of land surface, 3,119 feet.				Thickness, feet	Depth, feet
Neogene
	Undifferentiated Pleistocene
			Soil, fine, sandy, black	2	2
			Silt, fine, brown; some caliche	12	14
			Silt, sandy, gray and tan, and fine sand	29	43
			Silt, sandy, tan; contains sand and caliche	19	62
			Sand, coarse, and fine gravel	18	80
			Gravel, fine to very coarse	11	91
			Sand, coarse, cemented	2	93
			Silt, soft, sandy, gray and yellow	17	110
			Sand, fine to coarse; contains silt	10	120
			Sand, coarse; some fine gravel	10	130
			Sand, coarse, tan-white	17	147
			Caliche and clay, hard, light-gray and white	3	150
			Silt, soft, varicolored; some sand	10	160
			Sand, coarse, and fine gravel	7	167
			Silt and clay, white-gray	23	190
			Sand, coarse to fine gravel	24	214
			Sand, coarse, and soft, sandy, red, tan, and yellow-brown silt	8	222
			Silt, sandy, tan and light-gray, containing coarse sand	18	240
			Sand, coarse	8	248
			Silt, hard, sandy, gray, containing coarse sand	7	255
			Sand, coarse, red-brown and white	25	280
			Silt, soft, blue-oray to tan and yellow-brown	20	300
			Sand, fine gravel, and soft gray-tan and yellow-brown clay	18	318
	Pliocene
		Ogallala Formation
			Sand, fine to medium, cemented	4	322
			Sand, coarse, containing some silt	18	340
			Sand, coarse, and fine gravel	28	368
			Sand, coarse, tan; some silt	20	388
			Silt, soft, sandy, tan	8	396
			Sand, coarse	10	406
			Clay, brown, containing limonite	3	409
			Silt, hard, sandy, tan to white	21	430
			Silt, clayey, tan	10	440
			Silt, clayey, tan; some sand	10	450
			Silt, sandy, tan; fragments of caliche	20	"470