Thin-section photomicrograph (cross-polarized light) of a pisoid from the Yates Formation. Note
irregular, lumpy, partially concentric coatings; fracturing ("autobrecciation") of micritic-
peloidal matrix; and evaporite plugging of remnant intergranular porosity. Sample is
from 1708.1 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 = 14.5 mm

© Peter A. Scholle, 1999

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