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Table of Contents

Abstract

Introduction

Geography

Geology

Ground Water

Water Bearing Formations

Well Records

Well Logs

References

Plates

Logs and Test Holes and Wells, continued

21. Log of test hole 21 in the SW corner sec. 31, T. 9 S., R. 36 W. Surface altitude, 3,450.2 feet.			Thickness, feet	Depth, feet
	Soil, dark gray downward to light gray		3	3
Sanborn formation
	Silt and very fine sand; yellow-gray		27	30
	Silt, buff, containing sand and fine gravel		10	40
	Silt, compact, light gray		10	50
Ogallala formation
	Silt, gray, containing sand and gravel		9	59
	Gravel and sand		5	64
	Silt, pink-tan, containing gravel and sand		23	87
	Gravel and sand		15	102
	Silt, sand, and caliche; buff		16	118
	Gravel, sand, silt, and caliche; yellow-gray		14	132
	Clay, silt, and caliche; white		12	144
	Gravel and sand; yellow and gray; containing silt. A few zones are cemented		26	170
	Silt, sand, and caliche; tan		9	179
	Gravel and sand; gray; containing silt		23	202
Pierre shale
	Shale, yellow-green and gray		8	210
	Shale, dark gray		10	220

22. Log of test hole 22 in the SE corner sec. 17, T. 10 S., R. 36 W. Surface altitude, 3,352.7 feet.			Thickness, feet	Depth, feet
Sanborn formation
	Silt and very fine sand; gray to tan		27	27
	Silt, gray, containing clay, sand, gravel, and caliche		1	28
	Silt and very fine sand; yellow-gray		1	29
	Silt with clay; yellow-buff; containing sand, caliche, gravel, and fragments of snails		11	40
Ogallala formation
	Gravel and sand; partly cemented		26	66
	Silt, pink-tan, containing sand, gravel, and caliche		12	78
	Gravel and sand		6	84
	Silt, sand, and gravel; gray-buff		6	90
	Gravel and sand		32	122
	Silt, sand, and gravel; tan		4	126
	Gravel and sand		10	136
	Silt, light yellow-gray		2	138
	Gravel and sand; gray; containing silt		12	150
	Silt, gray-buff, containing sand, caliche and gravel		10	160
	Gravel and sand		16	176
Pierre shale
	Shale, light gray-green		4	180
	Shale, dark gray		5	185

23. Log of test hole 23 in the NE 1/4 SE 1/4 sec. 20, T. 10 S., R. 36 W. Surface altitude, 3,322.5 feet.			Thickness, feet	Depth, feet
Sanborn formation
	Clay and silt; compact; gray		10	10
	Clay and silt; light gray; containing nodules of caliche and pebbles		16	26
	Silt and clay; buff; containing gravel and sand		14	40
	Gravel, sand, and silt; containing abraded pebbles of caliche		16	56
Ogallala formation
	Gravel, sand, and silt; cemented; buff		4	60
	Silt, buff; containing sand		6	66
	Gravel and sand; containing silt		24	90
	Silt, buff, containing sand and caliche		7	97
	Gravel and sand		37	134
	Silt, sand, and caliche; buff		7	141
	Gravel, sand, silt, clay, and caliche; white		9	150
	Silt and clay; light buff; containing caliche, sand, and gravel		24	174
	Gravel and sand		4	178
	Clay, white, containing silt and sand		7	185
	Gravel and sand; buff; containing silt and caliche		9	194
Pierre shale
	Shale, yellow in upper part to light blue-gray in lower part		6	200
	Shale, dark gray		20	220

24. Log of test hole 24 in the NE 1/4 NE 1/4 sec. 29, T. 10 S., R. 36 W. Surface altitude, 3,365.9 feet.			Thickness, feet	Depth, feet
	Soil, light gray-brown		2	2
Sanborn formation
	Silt and very fine sand; buff		44	46
	Clay and silt; light gray-green; containing sand and gravel		19	65
	Gravel and sand; buff; interbedded with silt and pebbles of caliche		17	82
	Silt, light buff		6	88
Ogallala formation
	Gravel and sand; cemented in zones		37	125
	Silt, caliche, sand, and gravel; gray		10	135
	Gravel and sand		3	138
	Silt, light gray; containing sand, gravel, and caliche		4	142
	Gravel and sand		4	146
	Silt, yellow-gray; containing sand, gravel and caliche		4	150
	Gravel, sand, and caliche		20	170
	Silt, gravel, sand, and caliche; yellow-buff		6	176
	Gravel and sand; containing clay		9	185
	Silt and caliche; gray; containing sand		2	187
	Gravel and sand		18	205
	Silt, light gray; containing sand and caliche		7	212
	Gravel and sand		11	223
	Silt, buff; containing gravel, sand, and caliche		9	232
	Gravel and sand		15	247
Pierre shale
	Shale, light yellow-green in upper part to gray in lower part		8	255

25. Log of test hole 25 in the SW corner sec. 31, T. 10 S., R. 35 W. Surface altitude, 3,353.4 feet.			Thickness, feet	Depth, feet
	Road fill		2	2
Sanborn formation
	Silt and very fine sand; yellow-gray		15	17
	Silt, gray-brown to white; containing sand, gravel, and caliche		3	20
Ogallala formation
	Silt, clay, sand, gravel, and caliche; white		12	32
	Gravel and sand; cemented		13	45
	Silt, caliche, sand, and gravel; light brown		10	55
	Gravel, sand, and caliche		14	69
	Silt, clay, sand, and caliche; light green-yellow to light brown		29	98
	Sand, cemented		22	120
	Gravel and sand		20	140
	Silt, green and brown; containing sand, caliche and clay		24	164
	Sand, yellow-brown; containing silt		12	176
	Silt, clay, sand, and caliche; yellow-brown		11	187
	Gravel and sand		7	194
	Clay and silt; yellow-buff and light gray-green		7	201
	Gravel and sand		14	215
Pierre shale
	Shale, light gray-green and gray		5	220
	Shale, gray		10	230

26. Log of test hole 26 in the NW 1/4 NW 1/4 sec. 36, T. 10 S., R. 34 W. Surface altitude, 3,192.6 feet.			Thickness, feet	Depth, feet
Sanborn formation
	Silt and very fine sand; yellow-gray		23	23
	Silt and clay; tan; containing sand and gravel		7	30
	Silt and clay; light buff		6	36
Ogallala formation
	Silt, clay, sand, and gravel; buff		6	42
	Gravel, sand, and caliche; buff		15	57
	Silt, pink-tan; containing gravel and sand		10	67
	Gravel and sand		21	88
	Silt, tan; containing gravel and sand		6	94
	Gravel and sand		7	101
	Silt, pink-tan; containing sand and gravel		4	105
	Gravel, sand, silt, and caliche; tan		5	110
	Silt and clay; gray; containing gravel, sand and caliche		12	122
	Sand and gravel		8	130
	Gravel and sand; containing silt and caliche		17	147
Pierre shale
	Shale, greenish-gray, mottled yellow-brown and red		11	158
	Shale, dark gray		7	165

27. Log of test hole 27 in the SE 1/4 SE 1/4 sec. 36, T. 10 S., R. 34 W. Surface altitude, 3,182.6 feet.			Thickness, feet	Depth, feet
Sanborn formation
	Clay and silt; compact; gray		6	6
	Silt and clay; yellow-gray; containing very fine sand		14	20
	Silt and clay; yellow-gray; containing a small amount of fine gravel		12	32
Ogallala formation
	Silt, dull tan; containing clay, sand, and gravel		3	35
	Gravel, sand, silt, and caliche; tan		7	42
	Silt and clay; tan and gray; containing sand and caliche		16	58
	Gravel and sand		20	78
	Silt, tan, containing sand		5	83
	Gravel, sand, and caliche		5	88
	Silt and sand; compact; tan		4	92
	Gravel, sand, silt, and caliche; tan and gray		8	100
	Silt, sand, and gravel; gray and tan		8	108
	Gravel, sand, and caliche		29	137
	Silt, clay, sand, and caliche		10	147
Pierre shale
	Shale, light green-gray mottled with yellow and brown		8	155

28. Log of test hole 28 in the SE 1/4 SE 1/4 sec. 36, T. 10 S., R. 34 W. Surface altitude, 3,191.2 feet.			Thickness, feet	Depth, feet
	Soil, silty, gray		2	2
Sanborn formation
	Silt and very fine sand; tan-gray		21	23
	Silt and clay; gray-brown		12	35
	Silt and clay; tan-buff; containing gravel and caliche		12	47
Ogallala formation
	Gravel, sand, silt, and caliche; buff		9	56
	Silt, sand, gravel, and caliche; tan		2	58
	Gravel and sand; partly cemented		3	61
	Clay, bentonitic (?), silty, yellow-buff		4	65
	Silt, tan and gray; containing sand and gravel		9	74
	Gravel, sand, and caliche; gray and buff		30	104
	Silt, caliche, and sand; tan to gray		7	111
	Gravel, sand, and caliche; yellow-gray		19	130
	Sand, gravel, and clay; yellow-gray		15	145
	Silt, caliche, and sand; yellow-gray		7	152
	Gravel		4	156
Pierre shale
	Shale, light green, mottled yellow		4	160
	Shale, gray-green and gray		15	175

29. Log of test hole 29 in the SE corner sec. 36, T. 10 S., R. 32 W. Surface altitude, 3,053.8 feet.			Thickness, feet	Depth, feet
	Soil, gray-brown to black		3	3
Sanborn formation
	Silt and very fine sand; yellow-gray		20	23
	Silt, buff to white; containing clay, fine gravel, and caliche		2	25
Ogallala formation
	Gravel, sand, and caliche		13	38
	Silt, pink-tan; containing sand, caliche, and gravel		32	70
	Gravel and sand		12	82
	Silt, sand, and caliche; tan		6	88
	Gravel and sand; buff		6	94
	Silt, gravel, and sand; buff		21	115
	Gravel and sand; buff		10	125
	Silt, sand, and gravel; gray		9	134
	Gravel and sand		7	141
	Silt, gravel, and sand		2	143
	Gravel, sand, and silt; buff		13	156
	Silt, sand, and gravel, tan		8	164
	Gravel, sand, and silt; cemented with calcium carbonate; gray		16	180
	Silt, gravel, sand, and caliche; tan to gray		35	215
Pierre shale
	Shale, green-gray and yellow		5	220
	Shale, yellow to light gray-blue		10	230
	Shale, gray		20	250

30. Log of irrigation well at Colby Experiment Station, in the NE 1/4 sec. 2, T. 8 S., R. 34 W.			Thickness, feet	Depth, feet
	Soil		6	6
Sanborn formation
	Clay, white		30	36
Ogallala formation
	Sand rock		3	39
	Sand, fine		10	49
	Clay, red		52	101
	Sand (good water sand)		7	108
	Clay, red		9	117
	Sand (good water sand)		32	149
	Clay, red		11	160

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