Prehistory
The location where the park now sits was, 85 million years ago, the coastal shelf of a large inland sea. Sand deposited in the Late Cretaceous Period compacted over time and became sandstone. With the melting of the ice sheets at the end of the last Ice Age, water, ice and wind eroded the sandstone to produce the hoodoos and cliffs that are part of the park today.
Read more about this topic: Writing-on-Stone Provincial Park