Thin-section photomicrograph (plane-polarized light) of a
marine-cemented pisolitic dolomite showing transition from
pisoid to botryoidal cement crust. Note that the extremely
elongate rays of cement which extend from upper surface
of pisoid show squared crystal terminations. This has been
used as evidence for an originally aragonitic composition
for the cement (Loucks and Folk, 1976). Sample from 1739.3 ft
depth in Gulf/Chevron PDB-04 well on Northwestern Shelf of
Delaware basin, 30 km ENE of Carlsbad, Eddy Co., NM.
Long axis of photo = 16 mm

© Peter A. Scholle, 1999

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