Black and white lantern slide of several men digging in a marked excavation site on the Jonio Farm.

Black and white lantern slide of farmer John Jonio standing next to a wheelbarrow beside an excavation pit on his farm.

Black and white lantern slide of Robert Merrill and Audie Merrill standing next to a water pump at the Jonio farm.

Black and white lantern slide of a group of around 20 school children gathered around the excavation site at the Jonio farm.

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 roads connecting Zion, Bryce Canyon National Parks and Cedar Breaks National Monument.

Black and white lantern slide copy of a geological map of Yellowstone National Park and Yellowstone Forest Reserve from an unknow source.

Black and white lantern slide copy of a sketch cross-section of Amethyst Mountain in Yellowstone National Park, from an unknown source.

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.

Black and white lantern slide of three women sitting at a picnic in the woods near Croton Lake, Michigan.

Black and white lantern slide of a man standing in a water-filled ditch in which a mammoth tooth was found in Allegan County, Michigan. Several men stand or crouch on higher ground nearby.

Black and white lantern slide of a mammoth tooth from Allegan County, Michigan next to a measuring stick.

Black and white lantern slide of a man, Tony, holding a mammoth tooth in his right hand.

Black and white lantern slide copy of a sketch drawing of an ancient mine in Ontonagon County from an unknown source.

Black and white lantern slide copy of sketch drawings of outlines of ancient garden beds from an unknown source.

Black and white lantern slide copy of a map of Indian trails in west Michigan counties Ottawa, Kent, Muskegon, Newaygo, and Oceana.

Black and white lantern slide of a herd of camels on a dock in Naples, Italy. Nearer the camera a line of men in uniform stands facing the camels, and several buildings are visible in the background.

Black and white lantern slide of a train station near Pompeii, Italy.

Black and white lantern slide copy of a geological map of St. Paul, Minnesota.

Black and white lanern slide copy of a recession profile diagram of St. Anthony Falls, Minneapolis, Minnesota.

Black and white lanern slide copy of a recession map of St. Anthony Falls, Minneapolis, Minnesota.

Black and white lantern slide copy of a map of Lake Agassiz, large glacial lake in central North America during the last glacial period.