--> Waulsortian Facies of Tin Mountain Limestone, Bat Mountain, California, by David L. Jones; #91024 (1989)

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Waulsortian Facies of Tin Mountain Limestone, Bat Mountain, California

David L. Jones

Four Waulsortian mounds were discovered in the Tin Mountain Limestone at Bat Mountain. Rock types consistent with Waulsortian-type lithology characterize these mounds. Bryozoan-rich core facies mounds containing Stromatactis-like features are associated with coarse crinoidal flank facies beds. Bryozoa are found to be indigenous to core facies mounds. Bryozoan fronds form lattice works and mats that allowed for infiltering of lime mud, but they do not form a true framework. Lime mud was produced locally to the mounds, probably by an as-yet-unrecognized organism. Crinoids are indigenous to flanks as they are the normal Tin Mountain lithology. Mounds developed with thickets of crinoids surrounding them. Mound building was the result of sediment trapping by bryozoans and earl marine cementation. The Waulsortian facies of the Tin Mountain Limestone at Bat Mountain is late Kinderhookian and formed in an open-water marine environment, below wave base, and just below the active photic zone.

AAPG Search and Discovery Article #91024©1989 AAPG Pacific Section, May 10-12, 1989, Palm Springs, California.