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
Gulf Trough of roughly , material born of erosion began building up more rapidly in the Gulf Trough, due to the uplifting of the Appalachian Mountains to the north, which provided the primary source of siliciclastic material transported south via rivers and streams. By the Early Miocene, the trough was filled, and materials continued to move southward covering and replacing the carbonate-depositing marine environment with sands, silts, and clays; these sediments created the peninsula on which terrestrial flora and fauna could become established. Gulf Trough The Gulf Trough, also known as the Suwanee Straits, is an ancient geologic feature of Florida present