Between the land sloping away from the base of these rock layers and the layers themselves, there is a gap of nearly 3 billion (yes, billion with a "b") years of geologic history, also known as an unconformity.
More tilted rock layers, possibly limestone - this part of Montana was once underwater.
More tilted rock layers, possibly limestone - this part of Montana was once underwater.
More folded and titled rock
Ancient mud with fossilized cracks
Limestone - a happy home to lichen and moss - some of the rock in this area had shells embedded throughout - so cool to find evidence of ancient aquatic life on now bone-dry land!