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The Wrangellia terrane (named for the Wrangell Mountains, Alaska) is a crustal fragment extending from the south-central part of Alaska and along the Coast of British Columbia in Canada. Some geologists contend that Wrangellia extends southward to Oregon , [ 1 ] although this is not generally accepted.
Stikinia (in blue) at 330, 269, and 251 Ma, or before the breakup of Pangaea. At 269 Ma Stikinia is accompanied by the Wrangellia and Alexander terranes (west) and the East Klamath terrane (southeast). View centred on 60th meridian west.
The Wrangellia terrane, as one of the largest in Alaska formed beginning 300 million years ago in the Pennsylvanian and built up with basalt, carbonate and phyllite during the Triassic (these rocks are exposed from the Alaska Range to the Wrangell Mountains). Originating as a volcanic island arc, Wrangellia exhausted its magma supply and began ...
The Cache Creek terrane is near the center and is the remains of oceanic crust, in the form of basalt, argillite, chert, gabbro, various ultramafic rocks and limestone dating from the Pennsylvanian to the Jurassic. The Yukon-Tanana and Slide Mountain terranes accreted between the Devonian and the Triassic. The Snowcap Assemblage metamorphosed ...
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