Upper Jurassic-Lower Cretaceous palynostratigraphy of the Aklavik Range, Northwest Territories, Arctic Canada ...

Quantitative palynostratigraphy of Lower Cretaceous rocks from the Aklavik Range, Northwest Territories, is used to provide insight into paleoenvironmental conditions in the Boreal Realm during the Jurassic-Cretaceous transition. Paleoenvironmental reconstruction of this time interval is based on pa...

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Bibliographic Details
Main Author: Nguyen, Anne Van
Format: Article in Journal/Newspaper
Language:unknown
Published: Science 2019
Subjects:
biostratigraphy
Ecology
FOS Biological sciences
Geology
FOS Earth and related environmental sciences
Paleobotany
Paleoecology
Paleontology
Palynology
Arctic
Northwest Territories
Canada
Aklavik
Aklavik Range
Online Access:https://dx.doi.org/10.11575/prism/36424
https://prism.ucalgary.ca/handle/1880/110242
Description
Summary:Quantitative palynostratigraphy of Lower Cretaceous rocks from the Aklavik Range, Northwest Territories, is used to provide insight into paleoenvironmental conditions in the Boreal Realm during the Jurassic-Cretaceous transition. Paleoenvironmental reconstruction of this time interval is based on palynoassemblages preserved in the Husky Formation (upper Tithonian – lower Berriasian). Relative abundance of ecologically-important spore and pollen taxa such as Cupressaceae-Taxaceae and Classopollis classoides pollen reveal increasing humid conditions with a seasonally arid phase during the early Berriasian. Dinoflagellate cyst assemblages preserved in the purported Martin Creek Formation (lower Berriasian) include potential biostratigraphically significant species Oligosphaeridium cf. tenuiprocessum. A revised late Albian age is proposed for the succession, which may be stratigraphically attributed to the Arctic Red Formation. High relative abundance and diversity of fern spores indicate that high moisture ...

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