This is an 8 inch by 10 inch painting on stretched canvas done today. If you have visited Yellowstone Park, you have probably seen the Grand Canyon of the Yellowstone River, and this huge waterfall, called Lower Falls of the Yellowstone. Yes, there actually is yellow colored stone in the Yellowstone Canyon.
The falls is 308 feet high. Here is some info from the National Park Service.
Detail of painting. The painting is for sale HERE $250.