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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.
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 ...
This specimen was the first occurrence of a hadrosaur in south-central Alaska, one out of only four vertebrate fossils from the entire Wrangellia Composite Terrane, and the first associated skeleton of an individual dinosaur in Alaska. [73] Mama Dry [54] CM 3392 Carnegie Museum of Natural History: Dryosaurus elderae: Late Jurassic: Morrison ...
Wrangellia Terrane; Wrekin Terrane; Y. Yakutat Block; Yukon–Tanana Terrane This page was last edited on 30 May 2015, at 22:36 (UTC). Text is available under the ...
In the north, the insular belt is an accreted terrane, forming the margin. This belt extends from the Wrangellia Terrane in Alaska to the Chilliwack group of Canada. [6] A rupture in Rodinia 750 million years ago formed a passive margin in the eastern Pacific Northwest.
The decline is attributed to early phases of the Wrangellia large igneous province enriching the ocean with osmium-188. Osmium-188 is preferentially sourced directly from the mantle, while osmium-187 is a radiogenic isotope supplied from eroded land.
Wrangellia terrane This page was last edited on 2 July 2023, at 04:35 (UTC). Text is available under the Creative Commons Attribution-ShareAlike 4.0 License ...
The Gambier Group is an Early Cretaceous aged geologic group in the southern Coast Mountains of British Columbia, Canada.It was formed on the easternmost point of the Wrangellia Terrane as a volcanic arc about 100 million years ago along a west-to southwest-dipping subduction zone. [1]