Black and white lantern slide of farmer John Jonio holding two mastodon bones found at his farm.

Black and white lantern slide copy of a map of a mastodon excavation site in Barry County, Michigan drawn by Robert Hughes.

Black and white lantern slide of several men standing near a ditch and excavation site of a mastodon skeleton in Barry County, Michigan.

Black and white lantern slide of several mastodon bones lined up in front of a hay-filled wagon bed in Barry County, Michigan.