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Full-Text Articles in Physical Sciences and Mathematics
Reconstructing Wildfire Regime During The Warm Paleocene-Eocene Climate Using Molecular Biomarkers From The Chuckanut Formation In Northwest Washington, U.S.A., Alexandra Thompson
Reconstructing Wildfire Regime During The Warm Paleocene-Eocene Climate Using Molecular Biomarkers From The Chuckanut Formation In Northwest Washington, U.S.A., Alexandra Thompson
WWU Graduate School Collection
Wildfires are expected to increase in frequency and severity as climate changes in the Pacific Northwest of North America. To better understand the effect of warming climate on wildfire regimes, I present the first reconstruction of past wildfire frequency and severity during the Paleocene-Eocene transition in northwest Washington state, U.S.A. The Chuckanut Formation is a late Paleocene to Eocene sedimentary unit with a robust paleobotanical record showing the existence of subtropical forests in northwest Washington during the Paleocene, transitioning to a relatively cooler Eocene, dominated by temperate mixed forests. Geochemical records of environmental change coinciding with Paleocene-Eocene climatic change in …
Testing Potential Triggering Mechanisms Of Long-Runout Catastrophic Rock Avalanches In The Nooksack River Basin, Whatcom County, Washington, Eric R. Brown
WWU Graduate School Collection
The Nooksack basin contains five large Holocene long-runout rock avalanche deposits. Similarities and spatial proximity of the deposits suggest that they may share a common triggering mechanism. Two of the deposits, Van Zandt Landslide Complex (VZLC) and Church Mountain Sturzstrom (CMS) have published ages that overlap with prehistoric earthquakes, suggesting seismicity may be the cause. To further test this idea, I mapped and dated the remaining three deposits, Racehorse Creek (RHC), Middle Fork (MFN), and Maple Falls (MF). To establish ages for the slides, I combined radiocarbon dating of organics in sediment cores from bogs in the debris fields and …
Palynological Differences Between The Chuckanut And Huntingdon Formations, Northwestern Washington, Kenneth Norman Reiswig
Palynological Differences Between The Chuckanut And Huntingdon Formations, Northwestern Washington, Kenneth Norman Reiswig
WWU Graduate School Collection
Pollen and spore assemblages from the Tertiary coal-bearing Chuckanut and Huntingdon Formations were studied to determine the existence and location of the southern boundary of the Bellingham Basin. Ages of deposition were determined for each formation based on the flora recovered. The age of the Chuckanut Formation ranges from Middle Paleocene at its base to Late Eocene at its top. The age of the Huntingdon in northwestern Washington is Late Eocene to perhaps Earliest Oligocene. From the evidence of palynomorph ranges, no definite age breaks were found within the Chuckanut Formation, or between the Chuckanut and Huntingdon Formations. The structure …
The Geology And Mineralogy Of Bentonites And Associated Rocks Of The Chuckanut Formation, Mt. Higgins Area, North Cascades, Washington, Susan Kinder Cruver
The Geology And Mineralogy Of Bentonites And Associated Rocks Of The Chuckanut Formation, Mt. Higgins Area, North Cascades, Washington, Susan Kinder Cruver
WWU Graduate School Collection
In the Mt. Higgins area, the Chuckanut Formation is in probable fault contact with pre-Tertiary metamorphlc rocks. The Chuckanut is over- lain by Oso volcanics (zircon fission track age of 43.2 ± 1.9 MY). A diorite body (k/At date = 53 ± 8 MY) crops out in the Granite Lake area and is thought to be intrusive into the Chuckanut. Sedimentary rocks of much of the study area are dominantly thick- bedded arkoses that are generally cross-bedded, and resemble the Chuckanut type section. Sediments cropping out along and near Deer Creek are different; black, bituminous shale is the dominant rock …
A Paleocurrent Analysis Of A Portion Of The Chuckanut Depositional Basin Near Bellingham, Washington, James Norman Hartwell
A Paleocurrent Analysis Of A Portion Of The Chuckanut Depositional Basin Near Bellingham, Washington, James Norman Hartwell
WWU Graduate School Collection
The Chuckanut Formation is an upper Cretaceous to lower Tertiary sequence of conglomerate, sandstone, siltstone, and some coal deposited by streams near Bellingham, in western Whatcom County, Washington. Paleocurrent analysis of an area in the northwestern portion of the Chuckanut Formation shows two stream directions: to the south or southeast for the lower and middle sections and to the west or northwest for the upper section of the unit. Distinct differences in the lithology of clasts in the conglomerates support this conclusion. Angular phyllitic and quartz clasts in the lower and middle sections probably were derived locally from the Barrington …