Abstract
Girvanella-bryozoan mud mounds of the Upper Mississippian Bluefield Formation in southeastern West Virginia formed in a very shallow marine environment in the presence of terrigenous sedimentation. The influence of both terrigenous clastic and carbonate deposition produced a characteristic sequence of mound development. The environmental stress caused by turbidity resulted in a low diversity fauna and prevented faunal succession that typically occurs in other mud mounds. Interpretation of the principal components analysis (PCA) of the point-count data suggests that the constituents of the Girvanella-bryozoan layers are autochthonous, whereas the constituents of the interbedded siliciclastic layers are allochthonous
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