LATE QUATERNARY ACTIVITY AND SEGMENTATION ON THE NORTHERN OQUIRRH FAULT AND ISOSTATIC REBOUND GRADIENTS IN THE TOOELE VALLEY FROM PLEISTOCENE LAKE BONNEVILLE SHORELINE ELEVATIONS, UTAH, USA

2020 ◽  
Author(s):  
Michael P. Bunds ◽  
◽  
Nathan A. Toke ◽  
Andrew Fletcher ◽  
Jeremy Andreini ◽  
...  
Keyword(s):  
Late Quaternary ◽  
Lake Bonneville ◽  
Isostatic Rebound

Early Holocene pinyon (Pinus monophylla) in the northeastern Great Basin

1990 ◽  
Vol 33 (1) ◽  
pp. 94-101 ◽  
Author(s):  
David B. Madsen ◽  
David Rhode
Keyword(s):  
Great Basin ◽  
Late Quaternary ◽  
Early Holocene ◽  
Hunter Gatherers ◽  
Pinus Monophylla ◽  
East Central ◽  
Lake Bonneville ◽  
Fine Grained ◽  
Pine Nut ◽  
Human Use

AbstractFine-grained excavation and analysis of a stratigraphic column from Danger Cave, northeastern Great Basin, suggests prehistoric hunter-gatherers were collecting and using singleleaf pinyon (Pinus monophylla) near the site for at least the last 7500 yr. Human use of the cave began after the retreat of Lake Bonneville from the Gilbert level, shortly before 10,000 yr B.P. In stratum 9, culturally deposited pine nut hulls appear in the sequence by about 7900 yr B.P. and are continuously present thereafter. A hull fragment in stratum 10 is directly dated to 7410 ± 120 yr B.P. These dates are at least 2000 yr earlier than expected by extrapolation to macrofossil records from the east-central and central Great Basin, and necessitate some revision of current biogeographical models of late Quaternary pinyon migration.

The Late-Quaternary morphostratigraphic record of glaciation, paleoseismicity and postglacial environmental changes in fjord-lakes of Québec-Labrador 

2021 ◽  
Author(s):  
Patrick Lajeunesse ◽  
Annie-Pier Trottier ◽  
Antoine Gagnon-Poiré ◽  
Alexandre Normandeau ◽  
Etienne Brouard ◽  
...  
Keyword(s):  
Large Scale ◽  
Environmental Changes ◽  
Late Quaternary ◽  
Hydrological Regime ◽  
Lateral Extension ◽  
Glacial Erosion ◽  
Isostatic Rebound ◽  
Sediment Waves ◽  
Topographic Controls ◽  
Stratigraphic Record

<p>Hydroacoustic surveys were conducted in eight fjord-lakes of Québec-Labrador in order to analyse their Late-Quaternary geomorphological and stratigraphic record of glaciation, paleoseismicity and postglacial environmental changes. This large morphostratigraphic dataset provided a unique opportunity to establish a conceptual model of the evolution for fjord-lakes in relation to deglaciation, glacio-isostatic rebound, sediment fluxes and paleoseismicity. The analysis of the morphology and distribution of many morainic deposits into the fjord-lakes (hummocky moraines, morainic sills and morainic complexes) allows relating their formation to the glacial erosion potential, as well as to climatic and topographic controls. During past glaciations, a topographic sill was left uneroded at the opening of valleys due to the decrease in the glacial erosion potential associated with the lateral extension of the glacier down-ice; this bedrock sill created in turn an anchoring point to the ice during deglaciation. Hummocky moraines were documented at the outlet of five fjord-lakes that are located within the deepest and narrowest valleys of the studied systems. Based on our analysis of these sublacustrine landform-sediment assemblages, fjord-lakes constitute distinct sedimentary systems that should be differentiated from typical fjord system (i.e., in marine waters). The large-scale landforms contained in the fjord-lakes of Québec-Labrador (i.e., esker, moraines, gullies, lateral banks, turbidity channels and circular cavities) are inherited from their past subglacial, glaciomarine and paraglacial conditions, while only small deltaic bedforms (i.e., sediment waves and crescent-shaped bedforms) were formed in postglacial times. The present-day hydrological regime of fjord-lakes of Québec-Labrador is considered river-driven, except for the lakes located near active seismic zones where widespread postglacial mass-movements are documented.</p>

scholarly journals Late Quaternary glacial history constrains glacio-isostatic rebound in Enderby Land, East Antarctica

2014 ◽  
Vol 119 (3) ◽  
pp. 401-413 ◽  
Author(s):  
Duanne A. White ◽  
David Fink
Keyword(s):  
Late Quaternary ◽  
East Antarctica ◽  
Glacial History ◽  
Isostatic Rebound

Reconstructed topography of Southern New England prior to isostatic rebound with implications of total isostatic depression and relative sea level

2012 ◽  
Vol 78 (1) ◽  
pp. 110-118 ◽  
Author(s):  
Bryan A. Oakley ◽  
Jon C. Boothroyd
Keyword(s):  
New England ◽  
Late Quaternary ◽  
Ice Sheet ◽  
Water Levels ◽  
Ice Thickness ◽  
Order Estimate ◽  
Sea Levels ◽  
Isostatic Rebound ◽  
Southern New England ◽  
Southeastern Margin

AbstractTopographic models of the late Quaternary landscape prior to isostatic rebound aid interpretation of glacial lake-water levels and geomorphic features as well as ice thickness, mantle viscosity and lithospheric strength. The well-established limit of glacial marine inundation in central and northern New England provides a test of total isostatic depression. Relative sea levels reflecting differing magnitudes of isostatic rebound show that published values of isostatic depression in southern New England would inundate the landscape in southern New England with marine water south of the limit of late Pleistocene marine inundation. This suggests that isostatic depression at the terminal margin of the Laurentide Ice Sheet (LIS) was < 35 m, and that previous workers overestimate isostatic depression in southern New England by > 50 m. A first-order estimate of ice thickness based on total isostatic depression and the observed uplift profile in southern New England supports the ‘thin ice’ models in New England. Ice thickness ranged from 100 m at the southeastern margin of the LIS, to > 1000 m at a point 300 km north of the terminal margin. This regional model places constraints on continental ice-sheet and geophysical models that should be considered in the future.

Fish Remains from Homestead Cave and Lake Levels of the Past 13,000 Years in the Bonneville Basin

2000 ◽  
Vol 53 (3) ◽  
pp. 392-401 ◽  
Author(s):  
Jack M. Broughton ◽  
David B. Madsen ◽  
Jay Quade
Keyword(s):  
Salt Lake ◽  
Late Quaternary ◽  
Freshwater Species ◽  
Lake Levels ◽  
Lake Bonneville ◽  
The Past ◽  
Terminal Pleistocene ◽  
Fish Remains ◽  
Bonneville Basin ◽  
Source Of Information

AbstractA late Quaternary ichthyofauna from Homestead Cave, Utah, provides a new source of information on lake history in the Bonneville basin. The fish, represented by 11 freshwater species, were accumulated between ∼11,200 and ∼1000 14C yr B.P. by scavenging owls. The 87Sr/86Sr ratio of Lake Bonneville varied with its elevation; 87Sr/86Sr values of fish from the lowest stratum of the cave suggest they grew in a lake near the terminal Pleistocene Gilbert shoreline. In the lowest deposits, a decrease in fish size and an increase in species tolerant of higher salinities or temperatures suggest multiple die-offs associated with declining lake levels. An initial, catastrophic, post-Provo die-off occurred at 11,300–11,200 14C yr B.P. and was followed by at least one rebound or recolonization of fish populations, but fish were gone from Lake Bonneville sometime before ∼10,400 14C yr B.P. This evidence is inconsistent with previous inferences of a near desiccation of Lake Bonneville between 13,000 and 12,000 14C yr B.P. Peaks in Gila atraria frequencies in the upper strata suggest the Great Salt Lake had highstands at ∼3400 and ∼1000 14C yr B.P.

Late Quaternary Evolution of a Fjord Environment in Preservation Inlet, New Zealand

1992 ◽  
Vol 38 (3) ◽  
pp. 331-346 ◽  
Author(s):  
Richard A. Pickrill ◽  
Julianne M. Fenner ◽  
Mathew S. McGlone
Keyword(s):  
New Zealand ◽  
Sea Level ◽  
Late Quaternary ◽  
Present Condition ◽  
Sedimentation Rates ◽  
Seismic Profiles ◽  
Isostatic Rebound ◽  
Last Glaciation ◽  
Freshwater Fauna ◽  
Rising Sea Level

AbstractHigh-resolution seismic profiles, as well as sedimentological and micropaleontological analyses of three cores, are used to reconstruct the environmental and sedimentological evolution of Preservation Inlet, the southernmost New Zealand fjord. Toward the end of the last glaciation, a series of deep oligotrophic lakes, impounded by shallow sills, occupied Preservation Inlet. Glaciers filled the headwater valleys and the vegetation consisted of a sparse cover of grass, scrub, and shrubs. The principal rivers discharged into the head of these lakes forming large sandy deltas, while finely laminated clays were deposited in the distal basins. As the climate started warming ca. 18,000 yr B.P., the snowline rose and glaciers retreated. Developing forests were dominated by Metrosideros and Cyathea fringed by coastal shrubland. In the now more productive lakes, a rich freshwater fauna developed, sedimentation rates increased, and organic mud accumulated. Under rapidly rising sea level, between 9500 and ca. 8000 yr B.P., the sills enclosing the lakes were successively overtopped. Marine water intruded into the fjord basins and flooded the deltas at the head of the lakes. By 6500 yr B.P. sea level had stabilized and the fjord assumed its present condition. Shrubs decreased in abundance and forests dominated by Weinmannia and Dacrydium cupressinum then developed. A forest dominated by Nothofagus fusca spread between 2000 and 1500 yr B.P., indicating a cooler climate. In Preservation Inlet and other New Zealand fjords, eustatic sea-level rise has been greater than isostatic rebound or tectonic uplift. Coastal inundation has resulted in a transgressional sequence from a limnic to marine environment. This contrasts with fjord coasts of the northern hemisphere where isostatic rebound has produced coastal emergence, or coastal emergence followed by submergence.

A reevaluation of the isostatic rebound of Lake Bonneville

1983 ◽  
Vol 88 (B12) ◽  
pp. 10439-10447 ◽  
Author(s):  
S. Mete Nakiboglu ◽  
Kurt Lambeck
Keyword(s):  
Lake Bonneville ◽  
Isostatic Rebound

Late quaternary landscape history and archaeology in the ?Ice-Free Corridor?: Some recent results from Alberta

1996 ◽  
Vol 32 ◽  
pp. 113-126 ◽  
Author(s):  
A BEAUDOIN ◽  
M WRIGHT ◽  
B RONAGHAN
Keyword(s):  
Late Quaternary ◽  
Landscape History
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