نتایج جستجو برای: moraine

تعداد نتایج: 549  

2010
J. D. PEACOCK

Synopsis We present new interpretations of Digital Elevation Model (DEM) data and marine fossils collected from three sites on the Rhins of Galloway which, contrary to recent proposals, suggest that the landforms and deposits of the region do not represent evidence for a readvance during the Lateglacial Period. Rather we suggest that the higharctic fauna found in the region are representative o...

2017
Richard Benjamin BENJAMIN H. RICHARD

A study of misfit streams and meandering depressions developed in ground moraine deposits near Dayton, Ohio has indicated that streams are re-establishing old stream courses, which persist as buried channels previously carved into bedrock. The erosion of deep meandering channels in bedrock appears consistent with melt-water streams let down through glacial ice. Such channels would subsequently ...

2005
A. E. Carlson D. M. Mickelson S. M. Principato D. M. Chapel

Interpreting past glacial dynamics from the glacial record requires that the depositional environments of glacial sediments and landforms be understood. In the case of interlobate deposits, models that incorporate various components of pro, supra and subglacial deposition have been developed and tested in the northern Kettle Moraine (nKM), Wisconsin; a large interlobate deposit that formed betw...

2017
Ohio Forsyth

The author identified three Late Wisconsin tills in Logan County in 1956, related them to soils in 1965, and named them the Marysville, Bellefontaine, and Pickrelltown in 1967, but included no correlations, which have since become established and are reported here. The Marysville Till is the youngest, is clay-rich and almost pebble-free, and has a shallow soil (Morley-Blount). Next older (south...

2010
Julie Brigham-Grette David M. Hopkins

Baldwin Peninsula, northwest Alaska, is a middle Pleistocene push-moraine complex composed of marine, fluvial, and glaciogenic sediments. The peninsula was formed by three ice lobes emanating from the De Long and Baird mountains and the Selawik Lowlands in the southwest Brooks Range during the Anaktuvuk River glaciation . This glaciation was nearly an order of magnitude more areally extensive t...

2017

The author identified three Late Wisconsin tills in Logan County in 1956, related them to soils in 1965, and named them the Marysville, Bellefontaine, and Pickrelltown in 1967, but included no correlations, which have since become established and are reported here. The Marysville Till is the youngest, is clay-rich and almost pebble-free, and has a shallow soil (Morley-Blount). Next older (south...

Journal: :Science 2009
Joseph M Licciardi Joerg M Schaefer Jean R Taggart David C Lund

The role of the tropics in triggering, transmitting, and amplifying interhemispheric climate signals remains a key debate in paleoclimatology. Tropical glacier fluctuations provide important insight on regional paleoclimatic trends and forcings, but robust chronologies are scarce. Here, we report precise moraine ages from the Cordillera Vilcabamba (13 degrees 20'S) of southern Peru that indicat...

2006
Kevin M. Sampson Laurence C. Smith

A modified Wolman pebble count, traditionally used in fluvial science, is used to assess relative ages for glacial moraines at Bloody and Sawmill canyons, eastern California. Results show statistically separable size distributions among surface deposits of five known moraine groups, with finer distributions associated with older deposits. Large variance in clast size prevents robust distinction...

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