The surrounding cliffs are layered with red sandstone and grey shale.

The specimen is composed of a single entire adult that is preserved as a compression fossil in finely bedded, light gray shale.

This ammonite occurs in a fine-grained grey shale, but has been severely flattened.

The Fort Simpson Formation is composed of grey shale and mudstone.

The mother was a white bundle of feathers, standing out clearly against gray shale.

The change from grey shale, brown slopes and reddish stone was abrupt, as if the canyon marked a distinct geographical division.

It is built of local red sandstone and grey shale.

Battered guardrails stretched along outcroppings of mossy gray shale.

Bedford shale is a marinite type of grey to dark-grey oil shale.

It is built of red and gray shale and sandstone.