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Saturday, November 14, 2020 | History

3 edition of Extensive readvance of late Pleistocene (YD?) alpine glaciers in the Nooksack River Valley, 10,000 to 12,000 years ago, following retreat of the Cordilleran ice sheet, North Cascades, Washington found in the catalog.

Extensive readvance of late Pleistocene (YD?) alpine glaciers in the Nooksack River Valley, 10,000 to 12,000 years ago, following retreat of the Cordilleran ice sheet, North Cascades, Washington

Dori J. Kovanen

Extensive readvance of late Pleistocene (YD?) alpine glaciers in the Nooksack River Valley, 10,000 to 12,000 years ago, following retreat of the Cordilleran ice sheet, North Cascades, Washington

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Published by Department of Geology, Western Washington University in Bellingham, WA .
Written in English

    Subjects:
  • Glacial epoch -- Washington (State) -- Nooksack River Valley -- Guidebooks,
  • Geology -- Washington (State) -- Nooksack River Valley -- Guidebooks,
  • Geology, Stratigraphic -- Pleistocene -- Guidebooks

  • Edition Notes

    Other titlesField trip guidebook, Friends of the Pleistocene, Pacific Coast cell, Western Collection.
    Statementby D. J. Kovanen and D. J. Easterbrook.
    GenreGuidebooks.
    ContributionsEasterbrook Don J. 1935-.
    The Physical Object
    Pagination[4], 74 p. :
    Number of Pages74
    ID Numbers
    Open LibraryOL13635001M
    OCLC/WorldCa60128613


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Extensive readvance of late Pleistocene (YD?) alpine glaciers in the Nooksack River Valley, 10,000 to 12,000 years ago, following retreat of the Cordilleran ice sheet, North Cascades, Washington by Dori J. Kovanen Download PDF EPUB FB2

Innear the town of Folsom, New Mexico, a spectacular discovery altered our understanding of early humans on the American continent. Scientists excavating a bison from the late Pleistocene age discovered a fluted projectile point wedged between the animal’s ribs—forceful evidence that humans existed during the Ice Age together with now-extinct animals.

Books Advanced Search New Releases Best Sellers & More Children's Books Textbooks Textbook Rentals Best Books of the Month of over 2, results for Books: "pleistocene. The most extensive glacier readvance, the Outer Local Glaciation, produced valley glaciers covering an area of around km 2.

Cosmogenic nuclide exposure ages from two boulders on the Hags Teeth moraine marking this event provide ages of ± and ± by: The most extensive glacier readvance, the Outer Local Glaciation, produced valley glaciers covering an area of around km2. Cosmogenic nuclide exposure ages from two boulders on the Hags Teeth.

chronologies from three mountain ranges in Alaska that reveal the timing and spatial extent of Late Pleistocene glaciation, and pay particular attention to age of the penultimate glaciation.

The most extensive glacier advance of the last glaciation occurred prior to the last global glacial maximum. Late Pleistocene Cosmogenic 36Cl Glacial Chronology of the Southwestern Ahklun Mountains, Alaska extensive position of the last glaciation early during the late Pleis- a standstill during retreat or a readvance occurred during a late phase of the Klak Creek glaciation (Briner and Kaufman, ).

The Late Pleistocene is an unofficial age in the international geologic timescale in chronostratigraphy, also known as Upper Pleistocene from a stratigraphic perspective. It is intended to be the fourth division of the Pleistocene Epoch within the ongoing Quaternary Period.

It is currently estimated to span the time between c.and c. 11, years ago. This book is the first of three volumes in which the recent knowledge of the extent and chronology of Quaternary glaciations has been compiled on a global scale.

This information is seen as a fundamental requirement, not only for the glacial workers, but for the wider user-community of general Quaternary workers. In particular the need for accurate ice-front positions is a basic requirement.

The moss floor of the forest bed comprised the most extensive group of plants found in the remains. The moss material, identified by L.

Cheney (Wilson ), was divided into 19 species. All the mosses are of existing species but are in general more northerly in their modern distribution than the Two Creeks Forest Bed location.

One explanation for such dome formation is that a late-glacial ice stream developed in the St. Lawrence Valley and drained most of the ice from central Maine before marine calving isolated an independent ice mass.

Rapid areal deglaciation ensued with only rare stillstands interrupting extensive disintegration. Ackert R. et al. Patagonian glacier response during the late glacial-holocene transition. Science (), – (). Glasser N. et al. The glacial geomorphology and Pleistocene history of South America between 38 degrees S and 56 degrees S.

Late Pleistocene mountain glacier response to North Atlantic climate change in southwest Ireland. Quaternary Science Reviews, 29, (), There is clear geomorphological and dating evidence to suggest that the mountains of western Ireland were sensitive to North Atlantic cooling episodes throughout the Lateglacial period.

Davis (b) provides an extensive organizational framework for the late Quaternary surficial geology in the LSRC along a km-long corridor between Hammer Creek and American Bar. This framework is based on descriptions from more than 60 stratigraphic localities, with temporal control provided by 50 radio-carbon ages and six distinct tephra.

The most extensive glacier readvance, the Outer Local Glaciation, produced valley glaciers covering an area of around km 2. Cosmogenic nuclide exposure ages from two boulders on the Hags Teeth moraine marking this event provide ages of ± and ± ka. Moreover, a lake-sediment core indicates that a small cirque moraine previously thought be of early Holocene age is also likely older than the tephra and consequently of late Pleistocene age.

Lateral and end moraines and wood mats ca 2 km downvalley of the present snout of Deming Glacier indicate that an advance during the Younger Dryas. Late Pleistocene sediments, landforms and events in Scotland: a review of the terrestrial stratigraphic record - Volume Issue - Jon W.

MERRITT, Adrian. Extensive readvance of Late Pleistocene (YD?) Alpine Glaciers in the Nooksack River Valley, 10 –12 Cosmogenic Cl age constraints on the deglaciation history of the Cordilleran ice.

Pleistocene Epoch - Pleistocene Epoch - Pleistocene events and environments: Environments during the Pleistocene were dynamic and underwent dramatic change in response to cycles of climatic change and the development of large ice sheets.

Essentially all regions of the Earth were influenced by these climatic events, but the magnitude and direction of environmental change varied from place to place. The two Wisconsin glaciations are correlated with the Tahoe and Tioga glaciations of Blackwelder.

The Hobart glaciation followed the Plio-Pleistocene deformation of the Sierra Nevada and subsequent erosion of the valleys to about their present level.

Glaciers at this time appear to have been quite extensive. We present here a comprehensive record of glaciation from a New Zealand valley glacier system covering the critiy period from the local last glacial maximum (LGM) to near the end of the last ice age. This record from a key site in the midlatitude Southern Hemisphere shows that the largest glacial advance did not coincide with the coldest temperatures during this phase.

Glaciers on stratovolcanoes of the Pacific Northwest of North America offer opportunities for dating late Pleistocene and Holocene glacier advances because tephra and fossil wood are common in lateral moraines and in glacier forefields. We capitalize on this opportunity by examining the Holocene glacial record at Mount Baker, an active stratovolcano in northwest Washington.

We present evidence of a late Pleistocene readvance of Cordilleran ice occurring on the central coast of British Columbia on Calvert Island, between northern Vancouver Island and Haida Gwaii. Evidence is provided by sedimentological and paleoecological information contained in a sedimentary sequence combined with geomorphic mapping of glacial.

N2 - Extensive glaciers covered the High Atlas mountains in Morocco during the late Pleistocene. On the northern escarpments of the Marrakech High Atlas a series of cirques perched at ~ to m fed their valley glaciers which in some cases extended to as low as m.

A late Pleistocene intertidal boulder pavement from an isostatically emergent coast, Dundalk Bay, Eastern Ireland. Earth Surface Processes and Landforms, 21, – ↑ McCabe, A M, Dardis, G F, and Hanney, P. Sedimentology of a Late Pleistocene submarine moraine complex, County Down, Northern Ireland.

Pleistocene Epoch, earlier and major of the two epochs that constitute the Quaternary Period of the Earth’s history, and the time period during which a succession of glacial and interglacial climatic cycles occurred. The base of the Gelasian Stage (2, to 1, years ago) marks the beginning of Pleistocene, which is also the base of the Quarternary Period.

Simple pebble tools, ephemeral cultural features, and the remains of maritime and terrestrial foods are present in undisturbed Late Pleistocene and Early Holocene deposits underneath a large human-made mound at Huaca Prieta and nearby sites on the Pacific coast of northern Peru. Radiocarbon ages indicate an intermittent human presence dated between ~15, and calendar years ago before.

These exposures are critical to an ongoing debate on the extent and timing of a Late Wisconsinan readvance across the lowlands around St. George's by: During late Wisconsin time the major glacial advance in the western part of the region investigated reached its farthest extent south in at least three pulses: 21, 19, yrs ago.

This study focuses on the late Pleistocene glacial history of the Okpilak-Kongakut Rivers region, northeastern Brooks Range (Fig.

1), located at the eastern fringe of the extensive mountain glaciation of northern Alaska. The goal is to identify the limits of late Pleistocene glaciers and to interpret the ages of glacial landforms within the five.

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): ABSTRACT: Radiocarbon-dated sediment cores from seven lakes and two bogs spanning the Cordillera de Mérida in the Venezuelan Andes were used to identify and date the regional history of late Pleistocene and Holocene glacial activity.

Coring sites were selected at different elevations across a pronounced rain. Previous Work. NZ represents one of only three areas in the SH midlatitudes that experienced extensive late Quaternary glaciation. During the LGM, valley glaciers 70– km in length reached the alpine forelands of the eastern Southern Alps, whereas shorter and steeper glaciers in the western Alps typically terminated into the Tasman Sea.

Book Description: Articles by prominent archaeologists and geological scientists shed new light on the late Palaeo-Indian cultures of the Great Lakes during a time of staggering environmental change and challenge, as the ice sheets retreated northward.

Late Pleistocene glaciers retreated rapidly, exposing the lake basins betw and {sup 14}Cmore» The sedimentary facies suggest that after {sup 14}C B.P.

glaciers were absent from the watersheds and remained so during the middle Holocene. The Younger Dryas (aro to 11, years BP) was a return to glacial conditions after the Late Glacial Interstadial, which temporarily reversed the gradual climatic warming after the Last Glacial Maximum (LGM) started receding aro BP.

It is named after an indicator genus, the alpine-tundra wildflower Dryas octopetala, as its leaves are occasionally abundant in late glacial. of late Pleistocene glacial stages (Fig. Accumulation zones beyond this mapping extend west up to almost m amsl at the Sierra crest.

Mapping concentrated on lateral moraines or boulder lines on ridges and valley sides that were followed in serpentine traverses, crossing contacts up and down slope while progressing along valleys. However, the late Pleistocene fossil record is somewhat limited and, in some cases, incomplete.

Numerous studies of vertebrate fossils, mostly from Florida localities, show that longleaf pine savanna specialists and residents were present at least as far back as the early Pleistocene, about 2 million years ago (Miller et al.

Late Proterozoic diastrophism. Upper Cambrian marine transgression and wide-spread late Cambrian-early Ordovician sedimentation, with less extensive deposits of middle and later Ordovician and early Silurian time. Main Caledonian orogenies of late Ordovician to Silurian, and a general withdrawal of the seas during much of the Silurian.

Two late-stage readvances of Iliuk ice were recognized in the Windy Creek area. The older of these was informally named “Ukak drift” (Pinney and Begét a, Pinney ). Ukak drift represents a late Pleistocene ice readvance and is preserved in upper Margot Creek and lower Windy Creek. thickness, and demonstrates that the former PIS remained extensive and close to its LGM extent in this region until, ka.

After this time rapid ice-sheet thinning, initiated at, ka, saw ice at or near its present dimension by ka. We argue this rapid thinning was triggered by a combination of the rapid. Climate and Geography. The end of the Pleistocene epoch (20, to 12, years ago) was marked by a global ice age, which led to the extinction of many megafauna most people don't know is that this capitalized "Ice Age" was the last of no less than 11 Pleistocene ice ages, interspersed with more temperate intervals called "interglacials.'.

A regionally extensive readvance deformed and truncated the uppermost glaciomarine sediments during the oceanic highstand. Striations and other ice flow indicators which are found underlying the Presumpscot Formation consistently trend NW-SE, while those found on exposed outcrops above the Presumpscot Formation dominantly trend NE-SW.

A subsequent readvance is dated between about and ka at its type locality near the east end of Atigun Gorge. Surficial deposits of Holocene age, although less extensive than those of Pleistocene glaciation, are locally significant.Part of a mastodon tusk weathering out of the Late Pleistocene Rogers Lake Beds in Death Valley National Park; image courtesy the book, Geological Story of Death Valley, by Dr.

Thomas Clements (longtime professor of geology at the University of Southern California). This is the very photograph that first fired my fascination with fossils in Death Valley.Mountains repeatedly during late Pleistocene time, con-structing an extensive moraine belt at the range front in the Sawtooth Valley.

The glacial sequence and the numerous lakes it hosts preserve a detailed record of those fluctuations, themselves a reflection of complex climatic processes during the .