What is the specific name of the sandstone that was forced upward by the laccolith and where else in Montana can it be seen?

The specific name of the sandstone forced upward by the laccolith is the "Morrison Formation." In Montana, it can also be seen in other locations, such as the Bear Paw Battlefield and the area around the Little Bighorn River. The Morrison Formation is notable for its rich fossil content and is part of the larger geological history of the region.