The deep boring at Spur . Plate 3. Vertical section of oolitic dolomite, a considerable partof which has been replaced by anhydrite. The spherules are ap-pressed and many appear to have been reduced by solution externallyso as to conform to the shapes of adjacent spherules. For furtherdescription see sample 78. X 40. (The vertical axis extends from left to right.). Plate 4. A. Photograph of a piece of core from 2250 feet belowthe surface. Reduced to two-thirds natural size. Anhydrite andquartz appear light. For description see sample number 90. B. Vertical section extending through part of a c
The deep boring at Spur . Plate 3. Vertical section of oolitic dolomite, a considerable partof which has been replaced by anhydrite. The spherules are ap-pressed and many appear to have been reduced by solution externallyso as to conform to the shapes of adjacent spherules. For furtherdescription see sample 78. X 40. (The vertical axis extends from left to right.). Plate 4. A. Photograph of a piece of core from 2250 feet belowthe surface. Reduced to two-thirds natural size. Anhydrite andquartz appear light. For description see sample number 90. B. Vertical section extending through part of a concretion ofanhydrite with dim outlines of straight structures which probablyare spicules of sponges. The rock, darker part of section, shows adim stratification gently flexed upward against the anhydrite concre-tion. See description of sample 94. X 20.
Size: 1256px × 1990px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauth, bookcentury1900, bookdecade1910, bookidcu31924004622084
