Question: Which of the three geological formations exposed in the Como Bluff was named for a post office on the eastern side of the Bighorn Basin in Wyoming?  
Sentence (from "Cloverly Formation"): The Cloverly Formation is a geological formation of Early Cretaceous age (Aptian to Albian stage) that is present in parts of Montana, Wyoming, Colorado and Utah in the western United States.
Relevant evidence: Yes