Fruitland Formation the Colorado-New Mexico state line, and is one of the most productive areas for coalbed methane in the United States. The Fruitland is underlain by the Pictured Cliffs Sandstone, and overlain by the more recent Kirtland Formation. The sequence of rocks represents the final filling of the Cretaceous seaway. The underlying Pictured Cliffs is a marginal marine sandstone, deposited in an environment similar to offshore barrier islands of the southeast United States. As the seaway retreated, the Pictured Cliffs was covered by the Fruitland Formation, which was deposited in near-shore swampy lowlands. The formation is dated to the late Campanian
Starved Rock State Park the National Register it had been determined that there were three "village and mound" sites within the park. Besides Corbin Farm and Little Beaver, the Simonson site, an open-air occupation site, is also considered a village and mound site. Simonson Site has faced significant alterations over the years Approximately 150 different types of plants grow at Starved Rock State Park. On the sandstone cliffs of Starved Rock State Park white pine, Canada yew and northern white cedar are found; these plants are more commonly found further north. On the surfaces of the canyons and cliffs, where it is cooler, other