“The landscape of Wyoming is the result of an erosive process
which was triggered by a massive uplift of the western part of the North American continent.
This uplift caused rivers to speed up their flow.
Soon they became rushing streams, cutting through layers of soft rock, then into harder metamorphic rock.
Wind, ice, and other forces of erosion carved the canyons and excavated the great basins so familiar in Wyoming.
This is all took place from the late Pliocene Epoch to the present –
a time when Wyoming's climate changed to an ice age and back.
Volcanic explosions and lava flows formed today's massive calderas and plateaus in the Yellowstone region.
Oceans covered parts of the state at different times. When the seas receded, the land was relatively level and featureless. Sand and silt, where deposited at the bottom of the seas, became compressed and solidified into layers of colorful sandstone, limestone, and shale, thousands of feet thick. Later, these layers bent, broke, tilted and eroded during the mountain building process. We can read these layers, exposed on mountain sides and canyon walls, like a geological calendar. Massive glaciers formed in the mountains in the last 250,000 years and finished that sculpting process, started by wind and water, to what we can see nowadays.

The Bighorn Basin, in which Greybull is situated, is a structural basin formed during the Laramide Orogeny of the early Tertiary. The Bighorn and Pryor Mountains in the east and north, the Owl Creek Mountains in the south, and the Absaroka Range in the west, surround the basin.”

We, at the Greybull KOA campground, can be helpful in organizing such a field trip. We can accommodate groups of students in a comfortable way, with shaded tenting areas, free WI-FI, and computers to access the internet, hot and cold showers, laundry facilities, kampstore, and a refreshing pool for the hours after you have been in the field. The campground is located centrally, close to the Bighorn Mountains (15 miles), and then for you and your students the very interesting sites of Ten Sleep and Sheep Mountain are both within a thirty minute drive.