Southeastern Pennsylvania, including York County, contains some remarkable geologic history. From rocks representing a fractured supercontinent 550 million years ago to sediment accumulating in a ...

The rocks in Glacier National Park’s mountains reveal ancient seabeds and rivers and volcanic activity from billions of years ago, noted geologist Kurt Constenius, a Whitefish native and geologist ...

One of the most impressive geologic features in Montana is the mountainside north of you. Notice the prominent layer of white limestone halfway up the mountainside. The rocks above this layer were ...