The fan pattern suggests ice movement from the northeast rather than from the southwest as Leverett suggested. WADENA DRUMLINS : Stop Four: Farm field of Ron and Sue Storbakken. Studies on both the regional and small scales of the lithology, sedimentology and stratigraphy of the Wadena drumlin field in central Minnesota, U.S.A., provide insights to the processes that operated within the Wadena lobe during the drumlin-forming phase. The western edge of the drumlin edge is buried by younger till and outwash from the Des Moines lobe. Studies on both the regional and small scales of the lithology, sedimentology and stratigraphy of the Wadena drumlin field in central Minnesota, U.S.A., provide insights to the processes that operated within the Wadena lobe during the drumlin-forming phase. They are quite evident on the topographic map. Peter Yu, Nick Eyles, Shane Sookhan, Automated drumlin shape and volume estimation using high resolution LiDAR imagery (Curvature Based Relief Separation): A test from the Wadena Drumlin Field, Minnesota, Geomorphology, 10.1016/j.geomorph.2015.07.020, 246, (589-601), (2015). The drumlins are elongated hills of glacial till. Abstract The Wadena drumlin field (WDF; ~ 7500 km 2 ) in west-central Minnesota, USA, is bordered along its outer extremity by the till-cored Alexandria moraine marking the furthest extent of the southwesterly-flowing Wadena ice lobe at c. 15,000 kyr BP. A drumlin, from the Irish word droimnín ("littlest ridge"), first recorded in 1833, in the classical sense is an elongated hill in the shape of an inverted spoon or half-buried egg formed by glacial ice acting on underlying unconsolidated till or ground moraine.Clusters of drumlins create a landscape which is often described as having a 'basket of eggs topography'. Boulder concentrations on the surface in the Wadena and Brainerd drumlin fields are expressed in much the same way. Newly available high-resolution Light Detection and Ranging (LiDAR) data reveal new information regarding the number, … Horizontal changes in the down-glacier direction in the nature of the drumlin till include an increase in the carbonate … There are approximately 1200 drumlins in the Wadena drumlin field. The study area extends from the Wadena drumlin field in central Minnesota to the northeastern part of the state (Figure 1). The Wadena drumlin field (WDF; ~7500km²) in west-central Minnesota, USA, is bordered along its outer extremity by the till-cored Alexandria moraine marking the furthest extent of the southwesterly-flowing Wadena ice lobe at c. 15,000kyr BP. 20,000 years ago and which as a whole contains 2000 drumlins across an area of 7500 km 2 . Sedimentary Geology, 62 (1989) 241-277 241 Elsevier Science Publishers B.V., Amsterdam - Printed in The Netherlands Lithology, sedimentology, and genesis of the Wadena drumlin field, Minnesota, U.S.A. BARRY GOLDSTEIN Geology Department, University of Puget Sound, 1500 N. Warner, Tacoma, WA 98416 (U.S.A.) Received December 1987; revised version … Boulders in these locations are defined as clasts ≤ 30 cm in diameter. Where undisturbed, boulder project area is the Wadena Drumlin Area (#17) The Wadena drumlin field contains about 1,200 drumlins laid out in a fan shaped pattern, which was formed by the Wadena lobe having spread to the west and south. Review of published descriptions of drumlin fields suggests that the following conditions are important to drumlin growth: (1) compressive longitudinal and possibly extending transverse strain rates in the ice, (2) thin ice such as occurs near the glacier margin, and (3) high pore-water pressure in the subglacial sediments. The Wadena drumlin field has a fanlike form with its long axis trending southwest and a fan margin of 70 miles along 130° of arc. This methodology is tested using a high resolution (3 m) LiDAR elevation dataset from the Wadena Drumlin Field, Minnesota, USA, which was constructed by the Wadena Lobe of the Laurentide Ice Sheet ca.
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