Article in the Washington Post: Was the Virginia mastodon really there, or was this a big mistake? (it wasn’t a mistake!) Credit is given to the volunteers from the Historic Rivers Chapter.
And another article, Rare find: Mastodon bones unearthed in Yorktown, in the Virginian Pilot.

Gerald Johnson, at the site of the mastodon dig. Members of the Historic Rivers Chapter of the Virginia Master Naturalists helped him dig the bones.