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A new Lower Ordovician species of Calathium , and skeletal structure of western Utah calathids by Church, Stephen B. is a Earth and Planetary Sciences article available to read on EtoBox.

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Conical and vase-shaped calathids are found in the Lower Ordovician Fillmore Formation of western Utah associated with intraformational conglomerates and small patch reefs. __Calathium yersini__ n. sp. exhibits patterns of both the inner and outer walls of calathid two-wall construction. The broadly annulate walls are constructed from meroms with fused proximal merom feet forming the inner wall. The reticulate-patterned outer wall is formed by interlocking stellate ribs at the distal end of each merom. Latitudinal (horizontal) ribs interlock adjacent merom ribs side by side at the tips of ribs while meridional (vertical) ribs overlap merom shaft to merom shaft. Inner and outer walls are perforate. Pore-canal casts preserved in silicified molds suggest an exit and entrance current circulation for inner and outer wall pores. Upper ends of the calathids are not preserved, but an open cup is interpreted from infill material and encrustation of the interior cup wall by epibionts. Epibionts commonly encrust and thicken __Calathium__ outer walls, with the cyanobacterium __Girvanella__ as the dominant encrusting organism. __Calathium yersini__ n. sp., among the earliest of receptaculitids,

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Author

Church, Stephen B.

Publisher

Bioone; Cambridge University Press; Cambridge University Press (CUP) (ISSN 0022-3360)

Published

1991

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)