Black dogfish to the clade formed by the granular dogfish ("C. granulatum") and combtooth dogfish ("C. nigrum"). The black dogfish is a common species, with a wide but discontinuous distribution in the temperate waters of the Atlantic Ocean; its range abuts, but does not extend into, the Arctic Ocean. In the northeast, it occurs from Iceland to Sierra Leone, including the Faroe Islands, southern Norway, and the Rockall Trough and Porcupine Seabight off Ireland. In the northwest, it is found from southern Greenland and Baffin Island to Virginia, being particularly abundant in the Laurentian Channel, and may occur further south to the
The Trough a "true whitewater run" (difficulty level = Class I-II). It is, however, a markedly beautiful stretch of river. The Trough General Store in Glebe at The Trough's mouth offers canoe rentals and shuttles canoers and kayakers to The Trough's opening near McNeill in the South Branch Wildlife Management Area. Several primitive campsites are accessible along this stretch. The area is well known as a habitat for bald eagles, hence its Potomac Eagle Scenic Railroad sightseeing train on the SBVR. Visitors can board the train at Wappocomo Station on West Virginia Route 28 in Romney. The Trough The Trough is a