of an extinct Pennsylvanian and Permian island arc, constitute a large igneous province, currently exposed in a long belt. Wrangellia collided and amalgamated with the Alexander Terrane by Pennsylvanian time. By the end of the Triassic, the Peninsular Terrane had also joined the Wrangellia composite terrane. A subduction zone existed on the west side of Wrangellia. Seafloor rocks too light to be subducted were compressed against the west edge of Wrangellia; these rocks are now known as the Chugach Terrane. A complex fault system, known as the Border Ranges Fault, is the modern expression of the suture zone between Wrangellia and Chugach Terranes. Over time, plate tectonics moved this amalgamation of crust generally northeastward into contact with the North American continental margin. The Wrangellia composite terrane collided with and docked to North America by Cretaceous time. Strike-slip displacement, with Wrangellia travelling northward, continued after docking, although the amount of post-accretion displacement is controversial. See also References Citations General sources External links Google search for maps of Wrangellia Large Igneous Provinces Commission: December 2008 LIP of the Month: The Accreted Late Triassic Wrangellia Oceanic Plateau in Alaska, Yukon, and British Columbia Terranes Lava plateaus Plateaus of the Pacific Ocean Flood basalts Triassic volcanism Volcanism of Alaska Volcanism of Yukon Volcanism of British Columbia Coast of British Columbia Large igneous provinces