[3] The Ravenscrag Formation includes a wide range of vertebrate and plant fossils, as well as economically significant coal seams[4] and clay deposits.

It is composed primarily of buff, grey and white silty claystone, with mudstone, siltstone, sandstone, and several significant coal seams.

[6] The Ravenscrag Formation reaches a maximum thickness of 244 metres (800 ft) and is present in southwestern Saskatchewan and the Cypress Hills area of southeastern Alberta.

The Ravenscrag Formation contains remains of vertebrates that provide important information about the dawn of the age of mammals after the Cretaceous-Paleogene extinction event.

Gymnosperms are represented by remains of Ginkgo and cupressaceous conifers such as Metasequoia and Glyptostrobus, and there are numerous types of leaves, seeds, flowers and other structures from angiosperms.