Scientific Classification
| Kingdom: Animalia |
| Phylum: Brachiopoda |
| Class: Rhynchonellata |
| Order: Rhynchonellida |
| Family: Leiorhynchidae |
| Genus: Cherryvalleyrostrum |
| Species: Cherryvalleyrostrum limitare (Vanuxem, 1842) |
Information
Geological Range
Paleogeographic Distribution
Stratigraphic Occurrences
| Union Springs Formation |
| Bakoven Member |
| Oatka Creek Formation |
| Cardiff Member |
| Chittenango Member |
| Cherry Valley Member |
| Mount Marion Formation |
| Marcellus Formation |
| Gander Run Member |
| Delaware Formation |
References
Hall, J., 1867 (as Leiorhynchus limitaris): p. 356, pl. 56, figs. 6-21.
Wilson, K., 2014 (as Leiorhynchus limitare): pp. 106, 107.
Linsley, D., 1994 (as Camarotoechia limitare): p. 188, figs. 14-29
Sartenaer, P., 2004 (article defining the genus Cherryvalleyrostrum and the type species, Cherryvalleyrostrum limitare, as well as describing it’s stratigraphic and geographic range): Link.
Remarks
From Wilson (2014, p.107) (as Leiorhynchus limitare): “Small ovate shell, with faint plications to the sides, with 3-5 plications in the fold and sinus. To 10mm.”
From Carl Brett: Originally described as Orthis limitaris by Vanuxem in 1842. Described by Hall as Atrypa limitaris in 1842, then as Leioryhnchus limitaris in 1860. Assigned to the genus Camarotoechia by Hall and Clarke, 1893. Recombined as Cherryvalleyrostrum limitare by Sartenaer in 2004.
The genus name and described stratigraphic range of this species are particularly inconsistent in the literature, despite its former importance in defining stratigraphic units.
Cherryvalleyrostrum limitare is diagnostic of the so-called “Marcellus fauna” which is found not only in the Appalachian Basin (NY, PA, MD) but also in the lower Delaware. This brachiopod is typically very poorly preserved as highly flattened and partially decalcified specimens crowded on some bedding planes in dark gray to black fissile shales. It is common in monspecific assemblages occasionally associated with poorly preserved small bivalves and nautiloids. Typically, these fossil assemblages are interpreted as highly tolerant benthic forms perhaps specifically adapted to very dysoxic settings. C. limitare occurs mainly in the Marcellus Subgroup, in both the union Springs and Oatka Creek formations but apparently mixes with the similar ectomorph Eumetabolotoechia multicostata, which occurs very similarly in flattened monospecific bedding planes.
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