The deep boring at Spur . or potash 93 Pyrite 72 Quartz 53^ 71 Rate of drilling 20 Red Beds 53 Returns in rotary . 2I Rhombopora : 76, 82 Rock samples 21 Analyses of 91 Roller bit 20 Saccammina _ 78 Salt 54, 72 Samples, description of 22 Of rock 21 San Angelo 7 Sands, interbedded 64 Sandy dolomite beds, fossils in 84 Selenite , 53 Septarian concretion 26 Shale .— 75 Interbedded .^ 65 Shaly dolomite beds, fossils in 84 Siliceous dolomite 29 Sizes of dolomite crystals 58 Of ooliths 61 Sketch map of part of Texas 94 Speed in drilling 20 Sponge spicules 82 Stacheia 80 Swenson, S. M
The deep boring at Spur . or potash 93 Pyrite 72 Quartz 53^ 71 Rate of drilling 20 Red Beds 53 Returns in rotary . 2I Rhombopora : 76, 82 Rock samples 21 Analyses of 91 Roller bit 20 Saccammina _ 78 Salt 54, 72 Samples, description of 22 Of rock 21 San Angelo 7 Sands, interbedded 64 Sandy dolomite beds, fossils in 84 Selenite , 53 Septarian concretion 26 Shale .— 75 Interbedded .^ 65 Shaly dolomite beds, fossils in 84 Siliceous dolomite 29 Sizes of dolomite crystals 58 Of ooliths 61 Sketch map of part of Texas 94 Speed in drilling 20 Sponge spicules 82 Stacheia 80 Swenson, S. M., and 7 Terms used, explanation of 18 Tests for potash in cuttings 92 Textularia jonesi 81 multilocularis 81 Texture of dolomite 62, 63 Triassic formation 53 Trochammina 78, 85, 86 Upper part of Red Beds 53 U. S. Geological Survey 9 Valvulina 79 palaeotrochus 79 rudis .. 79 Water 87 Well waters, potash in 95 Westward dip of strata ^ 93 Wichita and Albany formations 53 Worrell, S. H 59, 88, 92 Wrather, W. E 8, 12. Plate 1. A. Thin section of oolitic dolomite from somewhere be-tween 1250 and 2042 feet below the surface. The spherules areclosely appressed and the matrix in which they are imbedded is is seen in dim light lines. Much of the oolitic rock has been re-placed by anhydrite, which appears as light striated tracts in thesection. This is one phase of the rock described under number 74(4) in the descriptions of well samples. Vertical section. X 40.
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Keywords: ., bookauth, bookcentury1900, bookdecade1910, bookidcu31924004622084
