Question: Which masonry fort in the continental United States was  USS "Fort Marion"  named for 
Sentence (from "October 2010 North American storm complex"): The massive storm complex caused a wide range of weather events including a major serial derecho stretching from the Gulf Coast to the Great Lakes, a widespread tornado outbreak across the Southeast United States and Midwest and a blizzard across portions of the Canadian Prairies and the Dakotas.
Relevant evidence: No