Assertion: national park's glacier | /r/HasProperty | retreated after the lake nipissing stage
Facets:
value: from the lake michigan basin
type: LOCATION
value: fully
type: MANNER
Source sentences:
text: Once the glaciers had fully retreated from the Lake Michigan basin, after the Lake Nipissing stage, the same factors that created the dunes south of the current shoreline, expanded the existing shoreline.