By Jisuo Jin
This monograph is a part of an ongoing comparative learn of the biodiversity adjustments of the overdue Ordovician - Early Silurian brachiopods (the so much plentiful and numerous staff of shelly benthos at the moment) in continental-margin basins and inland seas of Canada. research of the brachiopod faunas is helping to appreciate many features (duration, quantity, depth, and timing) of the climatic alterations and their results on marine environments faraway from the location of the glaciation. The overdue Ordovician carbonate deposits now preserved within the Williston Basin include a wealthy and various benthic shelly fauna that lived within the historical equatorial epicontinental seas in advance of the past due Ordovician mass extinction occasion, and this paintings offers with the taxonomy, biostratigraphy, paleoecology, and paleobiogeography of the brachiopod fauna. The authors defined a complete of sixteen genera and 22 species and mentioned their historic residing environments and faunal provincialism.
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Extra resources for Late Ordovician Articulate Brachiopods: From the Red River and Stony Mountain Formations, Southern Manitoba
1997, pl. 5, figs. 1–4), which are unlike the largely discontinuous concentric rugae in most specimens figured by Dewing (1999). Most specimens of S. fluctuosa described by Jin et al. (1997) from the Hudson Bay Lowlands typically show criss-cross rugae that are largely confined to the disc area. The new genus Nasutimena is established mainly on the basis of S. fluctuosa, but also includes S. undulosa, which has an unusually large, nasute, resupinate shell, with very strong criss-cross rugae covering nearly the entire shell.
8, figs. 8–11. 1859 Strophomena planumbona (Hall); Hall, p. 54, fig. 7. 1973 Strophomena planumbona (Hall); Alberstadt, p. 45, pl. 5, figs. 13, 14. 1873 Strophomena planumbona (Hall); Meek, p. 79, pl. 6, figs. 3a–h. 1985 Strophomena planumbona (Hall); Davis, pl. 8, figs. 8–11. 1892 Strophomena planumbona (Hall); Hall and Clarke, pl. 9, figs. 15–17; pl. 9A, figs. 8, 9. 1988 Strophomena planumbona (Hall); Howe, p. 216, figs. 31. 1912 Strophomena planumbona (Hall); Foerste, p. 73, pl. 4, fig. 3; pl.
18, figs. 1–4; pl. 22, figs. 4–8. Types. Holotype GSC 109077, selected by Jin et al. (1995), came from the Selkirk Member, Red River Formation, Garson Quarry (GSC loc. C-205935), southern Manitoba. Additional material examined. Selkirk Member (MMMN I-94, I-686, I-2152, I-2852): 6 broken individuals with conjoined valves, and 13 ventral valves. Remarks. In terms of maximum size, Kjaerina hartae is the third largest-shelled species among the Red River brachiopods, attaining 30–40 mm in length and 40–55 mm in width.