John E. Clark writes on the archaeology of the Hill Cumorah.
John E. Clark, "Archaeology and Cumorah Questions," Journal of Book of Mormon Studies 13, no. 1–2 (2004): 144–51, 174
What does archaeology reveal about the immediate environs of the New York hill? Is there evidence of habitation by the millions involved in the final battles? Did ancient fortifications ever stand on the Palmyra hill? Currently, few general works on the archaeology of Pennsylvania or New York exist, so serious students must consult local histories, articles, and technical reports for details. These are particularly difficult to read and interpret.
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I am not an expert on New York archaeology, nor am I likely to be, but I took a few hours to peruse some of the literature and learned that the general course of prehistory outlined for New York fits comfortably and logically with the histories of adjacent regions and that it makes good anthropological sense. The inferences made from archaeological observations appear reasonably supported by known facts. When we pay attention to time and to cultural context, it becomes clear that the events described in the Book of Mormon did not occur in New York.
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Fourth, the archaeological record lacks evidence for cities, sedentism, corn agriculture, fortifications, and dense populations during Archaic, Early Woodland, and Middle Woodland times. In accord with these general observations about New York and Pennsylvania, we come to our principal object—the Hill Cumorah. Archaeologically speaking, it is a clean hill. No artifacts, no walls, no trenches, no arrowheads. The area immediately surrounding the hill is similarly clean. Pre-Columbian people did not settle or build here. This is not the place of Mormon’s last stand. We must look elsewhere for that hill. The Palmyra hill is still a sacred place and was the repository of the golden plates and other relics placed there by Moroni. How Moroni made his way to this place and constructed his time capsule of artifacts is a historic adventure for another time.