 In 1893, he returned to the St. Johns and began excavating sand mounds, including the one at Mount Royal.In two short seasons (two-and-a-half weeks in 1893 and three weeks in 1894), Moore excavated and backfilled almost all of the sand mound.He published his findings at Mount Royal in two parts in the "Journal of the Academy of Natural Sciences of Philadelphia" in 1894, a total of more than 250 pages.