Queen Charlotte Area Cenozoic tectonics and volcanism and their association with relative plate motions along the northeastern Pacific Margin

1993 ◽  
Vol 98 (B8) ◽  
pp. 14257-14277 ◽  
Author(s):  
R. D. Hyndman ◽  
T. S. Hamilton
Keyword(s):  
Plate Motions ◽  
Cenozoic Tectonics ◽  
Northeastern Pacific ◽  
Pacific Margin

The Pliensbachian ammonite Dayiceras dayiceroides and Early Jurassic paleogeography

1983 ◽  
Vol 20 (1) ◽  
pp. 86-91 ◽  
Author(s):  
Paul L. Smith
Keyword(s):  
British Columbia ◽  
Early Jurassic ◽  
Eastern Pacific ◽  
Western Tethys ◽  
Disjunct Population ◽  
Northeastern Pacific ◽  
Pacific Margin ◽  
Genetic Continuity ◽  
Central Atlantic ◽  
New Occurrences

Uptonia? dayiceroides Mouterde is placed in the genus Dayiceras and its age established as latest Jamesoni Zone to possibly earliest Domerian. The species is abundant and associated with faunas of Tethyan aspect along the northeastern Pacific margin. First occurrences in Oregon and Nevada and new occurrences in British Columbia are reported. Localities at apparently high paleolatitudes are attributed to post-early Pliensbachian transcurrent fault displacements. Genetic continuity with a disjunct population in Portugal is postulated via a central Atlantic seaway, here named the Hispanic Corridor, connecting the eastern Pacific and western Tethys Oceans. The existence of this corridor during the Pliensbachian is supported by several lines of independent paleobiogeographic evidence.

scholarly journals Diversity of bathyal macrofauna on the northeastern Pacific margin: the influence of methane seeps and oxygen minimum zones

2009 ◽  
Vol 31 (1) ◽  
pp. 94-110 ◽  
Author(s):  
Lisa A. Levin ◽  
Guillermo F. Mendoza ◽  
Jennifer P. Gonzalez ◽  
Andrew R. Thurber ◽  
Erik E. Cordes
Keyword(s):  
Methane Seeps ◽  
Oxygen Minimum Zones ◽  
Northeastern Pacific ◽  
Pacific Margin ◽  
Oxygen Minimum

GRAVITY TECTONICS AND PLATE MOTIONS

2008 ◽  
Vol 179 (2) ◽  
pp. 107-116 ◽  
Author(s):  
Claude Rangin ◽  
Xavier Le Pichon ◽  
Juventino Martinez-Reyes ◽  
Mario Aranda-Garcia
Keyword(s):  
North America ◽  
Gulf Of Mexico ◽  
Structural Studies ◽  
The South ◽  
Plate Motions ◽  
Western Margin ◽  
The North ◽  
Cenozoic Tectonics

Abstract This is an introduction to the series of papers presented in this volume that concerns the Cenozoic tectonics of the western margin of the Gulf of Mexico, from Texas in the north to the Veracruz area into the south. These combined offshore-onshore structural studies investigate the links between surperficial gravity slidings and deep crustal flow within the complex geodynamic framework of Mexico, located at the junction between the North America, Carribean and Pacific plates (including the earlier Farallon plate).

Malacological insights into the marine ecology and changing climate of the late Pleistocene – early Holocene Queen Charlotte Islands archipelago, western Canada, and implications for early peoples

2003 ◽  
Vol 81 (4) ◽  
pp. 626-661 ◽  
Author(s):  
Renée Hetherington ◽  
Robert G.B Reid
Keyword(s):  
Short Interval ◽  
Marine Ecology ◽  
Bivalve Species ◽  
Queen Charlotte Islands ◽  
Northeastern Pacific ◽  
Pacific Margin ◽  
High Turbidity ◽  
Cold Hardy ◽  
Cordilleran Ice Sheet ◽  
Protothaca Staminea

The first intertidal species to colonize the Queen Charlotte Islands archipelago along the northeastern Pacific margin of Canada after the last glacial maximum (LGM) was Macoma nasuta at 13 210 ± 80 14C years BP. Prior to this time, molluscs were likely excluded where grounded ice extended from the 2 km thick Cordilleran ice sheet on mainland British Columbia. Low water temperatures, high sedimentation rates, high turbidity, dilution, and low primary productivity limited invertebrate colonization subsequent to the LGM, a period of rapid sea-level and climate change. As an adult, M. nasuta is a facultative deposit-suspension feeder that tolerates high turbidity and lowered salinity, and its pediveligers and early juveniles must also have been able to survive these conditions. Subsequently, in addition to M. nasuta, Macoma irus (inquinata), Saxidomus giganteus, Protothaca staminea, Protothaca tenerrima, Hiatella pholadis, Clinocardium nuttallii, and Mytilus trossulus constituted a typical intertidal bivalve assemblage. These findings are explained in terms of the physiology, feeding mechanisms, development, and sediment preferences of living molluscs. The disappearance of most bivalve species between ~11 000 and 10 000 14C years BP indicates the onset of a short interval of low sea-surface temperatures coincident with the Younger Dryas cooling event. Some cold-hardy species persisted, including Clinocardium californiense, Mya truncata, and Serripes groenlandicus. Bivalve species not previously reported as Pleistocene fossils were collected in sediments dating older than 10 000 14C years BP. They include Macoma incongrua, Musculus taylori, Mytilimeria nuttallii, and Tellina nuculoides. Fossil assemblages of intertidal molluscs are used to map ancient shorelines and indicate which species were available as a subsistence resource for early peoples from at least 13 210 ± 80 14C years BP. Intertidal food biomass densities may have reached present commercially harvested levels on southern Moresby Island by 8800 ± 70 14C years BP and on northern Graham Island by 8990 ± 50 14C years BP. When early peoples might have been migrating along the littoral zone, the molluscan productivity of the outer coast was much higher than it is at present.

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