Although many geologic features of Glacier National Park were formed during the much longer period of glaciation ending over 10,000 years ago, Sperry Glacier — like all the glaciers in the park today — is a product of the recent Little Ice Age, the period of cooler average temperatures starting in about the 13th century and concluding in the mid-19th century.
Although many geological features of Glacier National Park were formed during the much longer period of glaciation that ended over 10,000 years ago, Sperry Glacier — like all glaciers in the park today — is a product of the recent Little Ice Age, the period of cooler average temperatures starting around the 13th century and concluding in the mid-19th century.