Assertion: national park's glacier | /r/CapableOf | cover 5,337 acres
Facets:
value: in 1850
type: TEMPORAL
Source sentences:
text: In 1850, the glaciers in the region near Blackfoot and Jackson Glaciers covered 5,337 acres (21.6 km2), but by 1979, the same region of the park had glacier ice covering only 1,828 acres (7.4 km2).