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Pennsylvanian and Mississippian pluricolumnal assemblages (class Crinoidea) from southern Mexico and a new occurrence of a column with a tetralobate lumen
Published online by Cambridge University Press: 20 May 2016
Extract
In a series of papers on Paleozoic stratigraphy and paleontology in southern Mexico, Buitrón and colleagues (Buitrón, 1977; Velasco De León and Buitrón, 1992; Buitrón et al., 1987; Villaseñor et al., 1987; and Esquivel-Macías, 1996) utilized the crinoid pluricolumnal taxonomy of Moore and Jeffords (1968) to help establish a Pennsylvanian age for the lower Santa Rosa Formation, the del Monte Formation, and the upper Patlanoaya Formation. Since 1968, crinoid pluricolumnal taxonomy and the biostratigraphic utility of pluricolumnals has received very little attention in North America. Whereas the biological classification of crinoids is vested primarily in attributes of the crown, these papers illustrated the biostratigraphic utility of crinoid columnals and pluricolumnals where crinoid crowns are not recovered. Indeed, this was the intent of R. C. Moore, when he embarked on his studies of columnals and pluricolumnals (Moore et al., 1968; Moore and Jeffords, 1968; and Jeffords and Miller, 1968).
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