scholarly journals Kinematics of the Chugach metamorphic complex, southern Alaska: Plate geometry in the north Pacific margin during the Late Cretaceous to Eocene

Tectonics ◽  
2012 ◽  
Vol 31 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Mitchell R. Scharman ◽  
Terry L. Pavlis
Keyword(s):  
Late Cretaceous ◽  
North Pacific ◽  
Metamorphic Complex ◽  
The North ◽  
Pacific Margin ◽  
Plate Geometry ◽  
The North Pacific

Late Cretaceous octobrachiate coleoid lower jaws from the north Pacific regions

2008 ◽  
Vol 82 (2) ◽  
pp. 398-408 ◽  
Author(s):  
Kazushige Tanabe ◽  
Pat Trask ◽  
Rick Ross ◽  
Yoshinori Hikida
Keyword(s):  
Late Cretaceous ◽  
North Pacific ◽  
Upper Cretaceous ◽  
Large Body ◽  
Three Dimensional ◽  
New Genera ◽  
Large Body Size ◽  
Diagnostic Features ◽  
The North ◽  
The North Pacific

Eight well-preserved cephalopod jaw fossils were discovered from the Upper Cretaceous (Santonian and Campanian) deposits of Vancouver Island, Canada, and Hokkaido, Japan. They occur individually in calcareous concretions and retain their three-dimensional architecture. Seven of them consist of a widely open outer lamella and a posteriorly projected inner lamella with a pointed rostrum. Both lamellae are made of fluorapatite, which may represent diagenetically altered chitin, and lack a calcareous element. Based on these diagnostic features, the seven jaw fossils are identified as lower jaws of the Coleoidea. Comparison with the lower jaws of modern coleoids allows us to distinguish the following new genera and species among them;Nanaimoteuthis jeletzkyiof the Order Vampyromorphida, andPaleocirroteuthis haggartiandP. pacificaof the Order Cirroctopodida. The lower jaws of these new taxa are clearly distinguished by having a much less projected inner lamella from those of modern and extinct species of the Superorder Decabrachia and the Order Octopodida. The maximum lengths of their outer lamellae (35.0-67.1 mm) are much larger than those of most modern vampyromorph and cirroctopodid species, indicating the large body size and weight of their owners. One of the other three lower jaws examined, characterized by a posteriorly extended outer lamella, may be assigned to the Octopodida. This study clearly demonstrates that large octobrachiate coleoids existed in the Late Cretaceous North Pacific.

Intra-seasonal and inter-annual patterns in the demographics of sand lance and response to environmental drivers in the North Pacific

2019 ◽  
Vol 617-618 ◽  
pp. 221-244 ◽  
Author(s):  
MR Baker ◽  
ME Matta ◽  
M Beaulieu ◽  
N Paris ◽  
S Huber ◽  
...  
Keyword(s):  
North Pacific ◽  
Environmental Drivers ◽  
Sand Lance ◽  
The North ◽  
The North Pacific ◽  
Annual Patterns
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