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 Mill Creek Mountain's ridges to rise over the South Branch. For canoeists, The Trough officially begins at the SVBR's wooden trestle at Sycamore just below where Stony Run joins the river. The Trough continues its northwestern course with several bends in the river and large boulders dislocated from the ridges above dotting its shores. The Trough passes into Hampshire County at High Knob (2,648 feet) on Mill Creek Mountain followed by a series of knobs separated by spring gaps. It is at the third spring gap where Wickham was once located at on the railroad. Following Wickham, Mill Creek Mountain's