McAllaster is a ghost town in Logan County, Kansas, United States.
[2] The McAllaster post office was discontinued in 1953.
McAllaster is mainly known for its mound bearing its name, the McAllaster Butte, where the first known fossils of the famous plesiosaur Elasmosaurus were discovered in 1867.
Other fossils possibly belonging to this latter have been discovered since, and the locality is dated to the Campanian stage of the Upper Cretaceous.
This article about a location in Logan County, Kansas is a stub.