Results 161 to 170 of about 3,034 (210)

Brecciated diamictons from Mohawk Bay, S. Ontario, Canada

Sedimentology, 1990
ABSTRACTExamination of sediments along the north shore of Lake Erie at Mohawk Bay reveals a relationship between the formation of intensely brecciated diamictons and the presence of sand‐block intraclasts. It is postulated that the sand blocks were subglacially deposited within a meltwater environment, and later frozen prior to being eroded and ...
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Paleobiology of the Sand Beneath the Valders Diamicton at Valders, Wisconsin

Quaternary Research, 1998
Previously undescribed pollen, plant macrofossils, molluscs, and ostracodes were recovered from a 2.5-m-thick glaciolacustrine unit of silty sand and clay at Valders, Wisconsin. The interstadial sediment was deposited about 12,200 14C yr B.P. after retreat of the Green Bay lobe that deposited diamicton of the Horicon Formation, and before advance of ...
Louis J. Maher, Norton G. Miller, Richard G. Baker, B.Brandon Curry, David M. Mickelson   +4 more
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Continent-Derived Vitric Mud and Mafic-Arc Rocks in Deep Kermadec Trench Diamictons

SEPM Journal of Sedimentary Research, 2000
ABSTRACT Bimodal volcanogenic sediments dredged from depths greater than 7 km on the Kermadec Trench inner slope at latitude 31°S comprise diamictons of mudstone, basalt, and dolerite clasts enclosed in noncalcareous mud. The mud and mudstones are medium-to-high-K rhyolitic vitric mud of continental-arc derivation that has been transported 900 km from ...
P. F. Ballance, H. A. Follas, P. C. Froggatt, E. V. Mikhailic   +3 more
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Clast fabric of diamictons associated with some roches moutonnées

Boreas, 1990
Clast fabric patterns in thin, dense, over‐consolidated diamictons overlying and abutting the stoss sides of 23 Canadian and Swedish roches moutonnées were investigated. These diamictons display sedimentary characteristics that are commonly regarded as typical of basally‐deposited tills formed under actively flowing ice.
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A weathered diamicton beneath Upper Weichselian sediments at Silvereke, southeastern Sweden

GFF, 1996
Abstract An at least 2 m thick, weathered, non‐glacial diamicton, buried beneath a 6 m thick Upper Weichselian glaciogenic sequence at Silvereke in SE Sweden, is composed of variously coloured angular/rhombohedral to rounded clasts set in a red or reddish‐brown matrix of clayey silty sand.
Mats Olvmo, Lars Ronnert, Sten R. Ekman, Siv Olsson   +3 more
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Lacustrine ostracodes in the Late Pleistocene Sunnybrook diamicton of southern Ontario, Canada

Canadian Journal of Earth Sciences, 1987
Two opposing interpretations have been made on the depositional origin of the Late Pleistocene Sunnybrook diamicton in the Metro-Toronto region of southern Ontario. The traditional view holds this deposit to be a till, but more recent arguments advocate a glaciolacustrine origin by suspension deposition and ice rafting.The discovery of a low-diversity
J. A. Westgate, F.-J. Chen, L. D. Delorme   +2 more
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A method of sampling clast-rich laminated diamictons for magnetic analyses

Canadian Journal of Earth Sciences, 1989
The sampling of nonlithified diamictons for magnetic analyses (anisotropy of magnetic susceptibility and paleomagnetic remanence) has been restricted to samples that are either massive, clay-rich sediments, or fine-grained ones with very low pebble contents.
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Sand intraclasts within a diamicton mélange, southern Niagara Peninsula, Ontario, Canada

Journal of Quaternary Science, 1990
AbstractSand intraclasts found within diamicton units along the north shore of Lake Erie in the Mohawk Bay area of the Niagara Peninsula would appear to be part of a ‘block‐in‐matrix’ mélange. The intraclasts are undeformed and many exhibit primary bedding structures.
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Distinction Between Tills and Other Diamictons Based on Textural Characteristics

SEPM Journal of Sedimentary Research, 1968
ABSTRACT Statistical parameters of the granule-to-clay size-frequency distribution efficiently differentiate till from alluvial-fan deposits and from outwash deposits. Discriminant functions utilizing mean, standard deviation, skewness, and kurtosis also separate the three types of sediment.
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Soft-sediment striated surfaces and massive diamicton facies produced by floating ice

1994
Abstract Soft-sediment striated surfaces, commonly associated with massive diamictites, have been described from many pre-Quaternary glacial sedimentary sequences around the world. A number of authors interpret these associations as evidence for a subglacial origin. However, soft-sediment striated surfaces are formed by the mechanical scouring action
C.M.T. Woodworth-Lynas, J.A. Dowdeswell
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