The deep boring at Spur . n+oi BoMinn r\f oi-wo+nllino rtrAomite from near the depth. Plate 11. Horizontal section of dolomite from near 3405 feetbelow the surface. The dolomite crystals are gathered into clusterswhich are separated by a reticular matrix containing some secondaryanhydrite. This condition appears to be the beginning of a change,which in a more advanced stage has resulted in the production of arock consisting mainly of anhydrite but with crystals of dolomitescattered like the centers of these clusters in the rock mass. Thetwo phases are closely associated in the samples. X 80.

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Keywords: ., bookauth, bookcentury1900, bookdecade1910, bookidcu31924004622084