James Pierson lists Church Buttes as a relay station, while Gregory Franzwa mentions the Church Butte Stage Station, but makes no connection between it and the Pony Express.  Bishop and Henderson note that the 1861 U. S. mail contract does not list Church Butte as a station.

http://www.nps.gov/parkhistory/online_books/poex/hrs/hrs6a.htm#90