Late Quaternary history of North Eurasian Norway spruce (Picea abies ) and Siberian spruce (Picea obovata ) inferred from macrofossils, pollen and cytoplasmic DNA variation

2015 ◽  
Vol 42 (8) ◽  
pp. 1431-1442 ◽  
Author(s):  
Mari Mette Tollefsrud ◽  
Małgorzata Latałowa ◽  
W. O. van der Knaap ◽  
Christian Brochmann ◽  
Christoph Sperisen
Keyword(s):  
Picea Abies ◽  
Norway Spruce ◽  
Late Quaternary ◽  
Picea Obovata ◽  
Dna Variation ◽  
Siberian Spruce ◽  
Cytoplasmic Dna ◽  
History Of ◽  
Quaternary History

The extent and meaning of hybridization and introgression between Siberian spruce (Picea obovata) and Norway spruce (Picea abies): cryptic refugia as stepping stones to the west?

2016 ◽  
Vol 25 (12) ◽  
pp. 2773-2789 ◽  
Author(s):  
Yoshiaki Tsuda ◽  
Jun Chen ◽  
Michael Stocks ◽  
Thomas Källman ◽  
Jørn Henrik Sønstebø ◽  
...  
Keyword(s):  
Picea Abies ◽  
Norway Spruce ◽  
Stepping Stones ◽  
The West ◽  
Picea Obovata ◽  
Siberian Spruce ◽  
Hybridization And Introgression

Late Quaternary history of colluvial deposition and erosion in hollows, central California Coast Ranges

1990 ◽  
Vol 102 (7) ◽  
pp. 969-982 ◽  
Author(s):  
STEVEN L. RENEAU ◽  
WILLIAM E. DIETRICH ◽  
DOUGLAS J. DONAHUE ◽  
A. J. TIMOTHY JULL ◽  
MEYER RUBIN
Keyword(s):  
Late Quaternary ◽  
California Coast ◽  
Central California ◽  
History Of ◽  
Quaternary History ◽  
Coast Ranges ◽  
California Coast Ranges

Late Quaternary glacial and interglacial environments of the Nechako River - Cheslatta Lake area, central British Columbia

2001 ◽  
Vol 38 (4) ◽  
pp. 719-731 ◽  
Author(s):  
A Plouffe ◽  
V M Levson
Keyword(s):  
British Columbia ◽  
Late Quaternary ◽  
Late Glacial ◽  
Lake Area ◽  
Glacial Lakes ◽  
Ice Flow ◽  
Coast Mountains ◽  
Quaternary Stratigraphy ◽  
History Of ◽  
Quaternary History

The Quaternary stratigraphy of the Nechako River – Cheslatta Lake area of central British Columbia is described and interpreted to reconstruct the late Quaternary history of the region. Exposures of glacial and nonglacial sediments deposited prior to the last glaciation (Fraser) are limited to three sites. Pollen assemblages from pre-Fraser nonglacial sediments at two of these sites reveal forested conditions around 39 000 BP. During the advance phase of the Fraser Glaciation, glacial lakes were ponded when trunk glaciers blocked some tributary valleys. Early in the glaciation, the drainage was free in easterly draining valleys. Subsequently, the easterly drainage was blocked either locally by sediments and ice or as a result of impoundment of the Fraser River and its tributaries east of the study area. Ice generally moved east and northeast from accumulation zones in the Coast Mountains. Ice flow was influenced by topography. Major late-glacial lakes developed in the Nechako River valley and the Knewstubb Lake region because potential drainage routes were blocked by ice.

The physical geography and geology of the estuary and Firth of Forth, Scotland

1987 ◽  
Vol 93 (3-4) ◽  
pp. 235-244 ◽  
Author(s):  
Michael A. E. Browne
Keyword(s):  
Sea Level ◽  
Late Quaternary ◽  
Physical Geography ◽  
Glacial Till ◽  
Estuarine Sediments ◽  
Volcanic Origin ◽  
Quaternary Glaciation ◽  
History Of ◽  
Quaternary History ◽  
Firth Of Forth

SynopsisThe Upper Palaeozoic bedrock, which is of sedimentary and volcanic origin, is briefly described. The origin of the Forth as a series of depressions in the bedrock surface probably owes much to erosion of a pre-existing Tertiary landscape during phases of Quaternary glaciation. The late Quaternary history of the area is described, relating the distribution of the sediments deposited in the Forth to climatic events and changes in relative sea-level. Since the acme of the last main glaciation about 20,000 years ago, late Devensian marine and estuarine sediments have been deposited on the underlying glacial till sheet at altitudes ranging from more than 120 m below O.D. to at least 46 m above O.D. Similarly, raised and buried beaches and their deposits occur at altitudes from 40 m above O.D. down to around 10 m below O.D. in the estuary. During the Flandrian, sea-level has fluctuated, reaching its maximum (about 11 to 15 m above O.D.) about 6500 years ago. The typical deposit of this period is the carse clay which forms a series of extensive, fertile raised mudflats around the estuary. The calcareous marine faunas of the carse clay and older deposits are outlined.

Late Quaternary history of the Ventura mainland shelf, California

1990 ◽  
Vol 94 (4) ◽  
pp. 317-340 ◽  
Author(s):  
Margaret Z. Dahlen ◽  
Robert H. Osborne ◽  
Donn S. Gorsline
Keyword(s):  
Late Quaternary ◽  
History Of ◽  
Quaternary History
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