Results 111 to 120 of about 2,967 (157)

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
exaly   +2 more sources

Using GIS to Evaluate an Enigmatic Diamicton in the Spring Mountains, Southern Nevada

Professional Geographer, 2003
Abstract The Spring Mountains are located in southern Nevada and lie along the western margin of the Las Vegas Valley. A diamicton located approximately 2,590 m (8,500 ft) above sea level in the Spring Mountains contains numerous striated limestone clasts ranging in size from 0.5 cm to 1.0 m.
John G. Van Hoesen, Richard L. Orndorff
exaly   +2 more sources

Genesis of diamicton in the Oak Creek Formation of south-east Wisconsin, USA

Sedimentology, 1992
ABSTRACTThe clayey diamicton of the Oak Creek Formation was deposited by the Lake Michigan Lobe of the Laurentide Ice Sheet during the late Wisconsin deglaciation. Rapid changes in the position of the ice margin may have been facilitated by a subglacial deforming bed.
exaly   +2 more sources

Pebble Fabric in an Ice-Rafted Diamicton

The Journal of Geology, 1985
Pebble fabric studies on ice-rafted diamictons have been limited to general observations, with authors noting preferences toward vertical, random, or horizontal orientations. To clarify such observations, pebble fabric data were collected from a fossiliferous diamicton of late Pleistocene age located on Whidbey Island, Washington. The ice-rafted origin
Eugene W. Domack, Daniel E. Lawson
openaire   +1 more source

Microstructures in diamictons—evidence of subglacial bed conditions

Geomorphology, 1992
Abstract Examination of microstructures within diamictons from southern Ontario, Canada, and southern Bavaria, and Baden-Wurttemburg, Germany reveal evidence illustrative of certain subglacial bed conditions. The microstructures from Ontario were obtained from a complex glacial melange unit that forms the internal structure of an isolated drumlin ...
J. Menzies, A.J. Maltman
openaire   +1 more source

Origin of diamictons on the Barents Sea shelf

Lithology and Mineral Resources, 2009
Occurrence conditions and lithological-paleontological characteristics of two diamicton units developed in the southeastern segment of the Barents Sea shelf are considered. It is shown that they are lithologically analogous to the present-day (undoubtedly aqueous) diamicton mud.
openaire   +1 more source

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 ...
openaire   +1 more source

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
openaire   +2 more sources

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.
openaire   +1 more source

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
openaire   +1 more source