Reinterpretation of a portion of the Munising moraine in northern Michigan Available to Purchase

Field relationships between topography and surficial sediments indicate that the 25-km-long segment of the Munising moraine south of Grand Marais in Michigan's northern peninsula is not composed of till as suggested or implied by others but consists of a series of heads of outwash and related stagnation landforms. Topographic and limited subsurface data support the interpretation that mean drift thickness in the segment is at least 10 to 20 m. These relationships show that the feature does not have a bedrock core and is not a classical end moraine. Instead, deglaciation was characterized by stagnation-zone retreat with glaciofluvial deposition at three successive ice-marginal positions defined by closely spaced morphosequences.