{"id":{"repo_id":"umn","oai_identifier":"oai:conservancy.umn.edu:11299/170659"},"canonical_url":"https://search.dev.ndltd.org/etd/umn/oai:conservancy.umn.edu:11299/170659","repository":{"repo_id":"umn","name":"University of Minnesota","base_url":"https://conservancy.umn.edu/server/oai/request"},"display":{"title":"Surface boulder concentrations of the Late Wisconsinan Rainy lobe, Minnesota, USA","abstract":"Surface boulder concentrations on the surface of till sheets are ubiquitous features of the Late Wisconsinan Rainy lobe. They occur irrespective of topography or position on the landscape and are commonly found littering the surface of uncultivated pastures and wooded areas within the Wadena and Brainerd drumlin fields of central Minnesota and the Toimi drumlin field and the Rögen moraine of northeastern Minnesota. Previous work in these locations noted the occurrence of surface boulders but dismissed them as an erosional lag or resulting from periglacial processes. Characterizations of boulder lithologies, the composition and texture of the underlying till, and mean transport length suggest that this is not the case, and that surface boulder concentrations are primary features of till deposition. We present models for surface boulder deposition in both lodgement till and deforming bed regimes.","abstract_html":"Surface boulder concentrations on the surface of till sheets are ubiquitous features of the Late Wisconsinan Rainy lobe. They occur irrespective of topography or position on the landscape and are commonly found littering the surface of uncultivated pastures and wooded areas within the Wadena and Brainerd drumlin fields of central Minnesota and the Toimi drumlin field and the Rögen moraine of northeastern Minnesota. Previous work in these locations noted the occurrence of surface boulders but dismissed them as an erosional lag or resulting from periglacial processes. Characterizations of boulder lithologies, the composition and texture of the underlying till, and mean transport length suggest that this is not the case, and that surface boulder concentrations are primary features of till deposition. We present models for surface boulder deposition in both lodgement till and deforming bed regimes.","abstract_has_math":false,"creators":["Berthold, Angela Jeannine"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-01","date_published":"2015-01","updated_at":"2026-07-24T05:19:48Z","subjects":["Boulder lag","Boulder pavements","Deforming bed","Rainy lobe","Surface boulders","Transport length","Geological sciences","Plan As (thesis-based master's degrees)","Department of Earth and Environmental Sciences","Swenson College of Science and Engineering","University of Minnesota Duluth","Master of Science","Master of Science in Geological Sciences"],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/11299/170659","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Berthold, Angela Jeannine"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2015-03-20T15:13:09Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2015-03-20T15:13:09Z"]},{"key":"dc:date.issued","label":"Date","values":["2015-01"]},{"key":"dc:type","label":"Dc Type","values":["Thesis or Dissertation"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Boulder lag","Boulder pavements","Deforming bed","Rainy lobe","Surface boulders","Transport length","Geological sciences","Plan As (thesis-based master's degrees)","Department of Earth and Environmental Sciences","Swenson College of Science and Engineering","University of Minnesota Duluth","Master of Science","Master of Science in Geological Sciences"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/11299/170659"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["University of Minnesota M.S. thesis. January 2015. Major: Geological Sciences. Advisor: Howard D. Mooers. 1 computer file (PDF); vi, 48 pages."]},{"key":"dc:description.abstract","label":"Abstract","values":["Surface boulder concentrations on the surface of till sheets are ubiquitous features of the Late Wisconsinan Rainy lobe. They occur irrespective of topography or position on the landscape and are commonly found littering the surface of uncultivated pastures and wooded areas within the Wadena and Brainerd drumlin fields of central Minnesota and the Toimi drumlin field and the Rögen moraine of northeastern Minnesota. Previous work in these locations noted the occurrence of surface boulders but dismissed them as an erosional lag or resulting from periglacial processes. Characterizations of boulder lithologies, the composition and texture of the underlying till, and mean transport length suggest that this is not the case, and that surface boulder concentrations are primary features of till deposition. We present models for surface boulder deposition in both lodgement till and deforming bed regimes."]},{"key":"dc:title","label":"Title","values":["Surface boulder concentrations of the Late Wisconsinan Rainy lobe, Minnesota, USA"]}]}],"canonical_facts":{"dc:creator":["Berthold, Angela Jeannine"],"dc:date.accessioned":["2015-03-20T15:13:09Z"],"dc:date.available":["2015-03-20T15:13:09Z"],"dc:date.issued":["2015-01"],"dc:description":["University of Minnesota M.S. thesis. January 2015. Major: Geological Sciences. Advisor: Howard D. Mooers. 1 computer file (PDF); vi, 48 pages."],"dc:description.abstract":["Surface boulder concentrations on the surface of till sheets are ubiquitous features of the Late Wisconsinan Rainy lobe. They occur irrespective of topography or position on the landscape and are commonly found littering the surface of uncultivated pastures and wooded areas within the Wadena and Brainerd drumlin fields of central Minnesota and the Toimi drumlin field and the Rögen moraine of northeastern Minnesota. Previous work in these locations noted the occurrence of surface boulders but dismissed them as an erosional lag or resulting from periglacial processes. Characterizations of boulder lithologies, the composition and texture of the underlying till, and mean transport length suggest that this is not the case, and that surface boulder concentrations are primary features of till deposition. We present models for surface boulder deposition in both lodgement till and deforming bed regimes."],"dc:identifier.uri":["https://hdl.handle.net/11299/170659"],"dc:language.iso":["en"],"dc:subject":["Boulder lag","Boulder pavements","Deforming bed","Rainy lobe","Surface boulders","Transport length","Geological sciences","Plan As (thesis-based master's degrees)","Department of Earth and Environmental Sciences","Swenson College of Science and Engineering","University of Minnesota Duluth","Master of Science","Master of Science in Geological Sciences"],"dc:title":["Surface boulder concentrations of the Late Wisconsinan Rainy lobe, Minnesota, USA"],"dc:type":["Thesis or Dissertation"]},"updated_at":"2026-07-24T05:19:48Z"}