LATE ORDOVICIAN BRACHIOPODS RAFINESQUINA-LATA WHITEAVES, 1896 AND KJAERINA-HARTAE N-SP FROM SOUTHERN MANITOBA AND THE HUDSON-BAY LOWLANDS

Examination of the Late Ordovician strophomenid brachiopod Rafinesquin a lata Whiteaves, 1896 from the Selkirk Member of the Red River Format ion of southern Manitoba reveals that the two syntypes actually repres ent two genera and two species, Oepikina lata and Kjaerina hartae n.sp . Specimens typically described as Rafinesquina lata by Whiteaves are large, thick-shelled, strongly but evenly concavo-convex, with randoml y spaced, fine, concentric growth lamellae and a high ventral interare a. Affinity of the species to Oepikina lies in its unequal parvicostel lae of the ventral valve, conspicuous dorsal peripheral rim, robust ca rdinal process, and strong lateral trans-muscle septa. Kjaerina hartae is easily distinguished from O. lata by its strongly geniculate and l ess massive shell, a much lower ventral interarea, prominent concentri c rugae, and, internally, considerably weaker trans-muscle septa. The shells of O. lata and K. hartae are unusually large and suggest an ope n, shallow- and warm-water, subtidal depositional environment for the original sediments of the Selkirk Member of the Red River Formation. C ommon occurrences of K. hartae in the upper Portage Chute and Surprise Creek formations (Bad Cache Rapids Group) of the Hudson Bay Lowlands, together with other brachiopods and other groups of fossils, support the concept that the epicontinental seas once covering the Hudson Plat form and the Williston Platform were connected during Late Ordovician (Maysvillian) time.