Woodland, R. B. (1958). Stratigraphic significance of Mississippian Endothyroid foraminifera in central Utah. Journal of Paleontology. 32(5): 791-814.

332767

Woodland, R. B.

1958

32(5): 791-814

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Study of thin-sections from samples of the Mississippian sequence in central Utah has yielded biostratigraphic data on the occurrence of endothyroid foraminifera. Distribution of these foraminifera in the Provo Rock Canyon section suggests four faunal zones. They are from the bottom up: Granuliferella zone and Plectogyra tumula subzone, Endothyra symmetrica zone, and Plectogyra kleina zone. New species of the genera Granuliferella, Plectogyra, and Endothyra are as follows: G. asperata, G.? granulella, P. gibbosa, P. turgida, P. bullata, P. kleina, E.? lanceolata, and E. hamula. Comparative phylogeny can be used to correlate upper Mississippian time equivalents between central Utah and Mississippi Valley. Lower Mississippian forms of the two areas are dissimilar and correlation is uncertain. A vagrant benthonic habit of endothyroids during life is indicated by limited lithologic association with unabraded echinoderm stem segments, irregularity of form, and granular wall of individuals. Flood occurrence is attributed to biological and ecological agents which periodically killed and preserved sensitive populations en massé. Negligible influence of sedimentary sorting on flood abundance is shown by association with unbroken and unabraded macrofossils and echinoderm stem segments. Meaning of euhedra and subhedra of calcite in encrinal rocks is not known with certainty but may have grown contemporaneous with deposition. Endothyroid sensitivity to environment is indicated by their diminished abundance or complete absence in rocks of non-calcareous composition and non-encrinitic texture.

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