Rockall part of the deeply eroded Rockall Igneous Centre that was formed as part of the North Atlantic Igneous Province, approximately 55 million years ago, when the ancient continent of Laurasia was split apart by plate tectonics. Greenland and Europe separated and the northeast Atlantic Ocean was formed between them, eventually leaving Rockall as an isolated islet. The RV "Celtic Explorer" surveyed the Rockall Bank in 2003. The Irish Light Vessel "Granuaile" (the same name as the steamer on the RIA 1896 botany survey) was chartered by the Geological Survey of Ireland, on behalf of the Department of Communications, Marine and
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