William W. Williams' History of Ashtabula County, Ohio says that Solomon Spaulding is the author of the Book of Mormon.
William W. Williams, History of Ashtabula County, Ohio (Philadelphia: Williams Brothers, 1878), 17
There are also other mounds in this neighborhood, though they are of comparatively small size. They were situated in the eastern part of the village. It is not improbable that the Book of Mormon has some connection with these mounds, and possibly may have been suggested by them. Its author, Rev. Mr. Spalding, lived in Conneaut, and the story is based on the common sentiment that the descendants of the lost tribes buried their dead in large heaps, which caused the mounds so common in this country. Their arts and sciences and civilization account for all the curious antiquities found in North and South America. This theory of the lost tribes has long since been exploded.