Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Physical Sciences and Mathematics
Paleogeography Of The Spieden Group, San Juan Islands, Washington, Patricia Allison Dean
Paleogeography Of The Spieden Group, San Juan Islands, Washington, Patricia Allison Dean
WWU Graduate School Collection
The Spieden Group in the San Juan Islands of Washington State consists of the Lower Cretaceous Sentinel Island Formation and the Upper Jurassic Spieden Bluff Formation. In order to constrain the location of its origin, paleomagnetism of the sedimentary rocks of the Spieden Group was studied to obtain paleolatitudes. Two components of magnetization were measured in most of the Sentinel Island Formation specimens. The second-removed component had a mean in-situ direction of D = 34.1°, I == 44. 2°, α95 = 12.0° and a mean tilt-corrected direction of D = 49.3°, I = 71.5°, α95 = 6.9°. Uncertainty …
Paleomagnetism Of The Jura-Cretaceous Kyuquot Group, Vancouver Island, British Columbia, Chad K. Hults
Paleomagnetism Of The Jura-Cretaceous Kyuquot Group, Vancouver Island, British Columbia, Chad K. Hults
WWU Graduate School Collection
The Kyuquot Group is a series of marine clastic deposits of Late Jurassic to Early Cretaceous age located on the NW portion of Vancouver Island. These sediments have been folded, but not metamorphosed, and so provide an attractive target for paleomagnetic study. Results from these rocks fill a significant (50 m.y.) time gap in our knowledge of the paleomagnetic paleolatitude record of Wrangellia. Paleomagnetic results from the underlying Bonanza Volcanics (Symons, 1984) show no significant relative latitudinal displacement of Wrangellia with respect to North America. This, along with geological correlations between other similar-aged clastic sediment units, has led several workers …