Photo credits

Each photo also carries a short credit in its caption or its title (the text shown when you point at it). Photos under a Creative Commons license are used under its terms; follow each link for the original file.

• Pumpellyite-(Mg) crystals on quartz, Copper Falls Mine, Keweenaw County (raw mineral, not a polished greenstone): Robert M. Lavinsky, CC BY-SA 3.0
• Native copper specimen, Caledonia Mine: James St. John, CC BY 2.0
• Native silver, Michigan Mine, Ontonagon County: James St. John, CC BY 2.0 (museum specimen)
• Lake Superior agate specimen: James St. John, CC BY 2.0
• Polished datolite nodule, Keweenaw County: Robert M. Lavinsky, CC BY-SA 3.0
• Thomsonite pebble from Minnesota's Lake Superior shore (not a Michigan specimen): Robert M. Lavinsky, CC BY-SA 3.0
• Prehnite with native copper, Keweenaw County: Robert M. Lavinsky, CC BY-SA 3.0
• Epidote-lined vug in basalt, Portage Lake Volcanics, Centennial Mine, Keweenaw Peninsula: James St. John, CC BY 2.0
• Calcite crystals with native copper and silver, Upper Peninsula: James St. John, CC BY 2.0
• Banded iron formation (jaspilite), Jasper Knob, Ishpeming: James St. John, CC BY 2.0
• Hematite specimen: Darla Sondrol, CC0
• Quartz with native copper, Keweenaw Peninsula: Robert M. Lavinsky, CC BY-SA 3.0
• Ore specimen from the Ropes Gold Mine, Ishpeming: Pacific Museum of Earth from Canada, CC BY-SA 2.0 (museum specimen)
• Kimberlite, Lake Ellen outcrop, Upper Peninsula (no diamond shown): John F. Green, CC BY-SA 3.0
• Gypsum, Grand Rapids: Pacific Museum of Earth from Canada, CC BY-SA 2.0 (museum specimen)
• Halite (rock salt), Salina Group, Detroit: James St. John, CC BY 2.0
• Celestine crystal, Woolmith (Scofield) Quarry, Monroe County: Robert M. Lavinsky, CC BY-SA 3.0
• Yooperlite cobble under UV light, Lake Superior shore, Upper Peninsula: James St. John, CC BY 2.0
• Puddingstone specimen: PaulDonelson, CC BY-SA 3.0
• Omarolluk rocks at their source, Belcher Islands, Hudson Bay: Mike Beauregard from Nunavut, Canada, CC BY 2.0
• Glacial erratic boulder, Porcupine Mountains Wilderness State Park: Curtis Abert, CC BY 2.0
• Rhyolite beach on Lake Superior: S. J. G., CC BY-SA 4.0
• Amygdaloidal basalt, Keweenaw Peninsula: James St. John, CC BY 2.0
• Jacobsville Sandstone from Jacobsville, Michigan, A. E. Seaman Mineral Museum: Chris857, CC BY-SA 3.0 (museum specimen)
• Dolostone breccia, Mackinac Breccia, near St. Ignace (museum display at Wittenberg University): James St. John, CC BY 2.0 (museum specimen)
• Staurolite-muscovite schist, Michigamme Formation, near Michigamme (Seaman Mineral Museum display): James St. John, CC BY 2.0 (museum specimen)
• Bituminous coal, Upper Freeport Coal, Linton, Ohio (not a Michigan specimen): James St. John, CC BY 2.0
• Cut and polished septarian nodule slab. The location, near Holland, Michigan, comes from the uploader only: LadyOfManyTalents, CC0
• Allegan meteorite fragment (2.9 g). The Allegan meteorite fell in Allegan County, Michigan, in 1899: Jon Taylor, CC BY-SA 2.0
• Polished Petoskey stone, close-up: James St. John, CC BY 2.0
• Favosites (Silurian), Mackinac County, Michigan, Smithsonian National Museum of Natural History (a Silurian specimen, not a Devonian Charlevoix-area stone): Smithsonian National Museum of Natural History, CC0 (museum specimen)
• Horn coral (solitary rugose coral) specimen: James St. John, CC BY 2.0
• Halysites (chain coral), Mackinac County, Michigan, Smithsonian National Museum of Natural History: Smithsonian National Museum of Natural History, CC0 (museum specimen)
• Branching tabulate coral (Thamnopora) in section, Oxford University Museum of Natural History (not a Michigan specimen): the paleobear from Lontananza, Loreto, Peru, CC BY 2.0 (museum specimen)
• Stromatoporoid with mamelons, Northport area, Michigan: James St. John, CC BY 2.0
• Fossil bryozoan (Fenestellidae), Belgium (not a Michigan specimen): Dwergenpaartje, CC BY-SA 3.0
• Crinoid head (calyx), Pyrenocrinus buehlerorum, Alpena County, Michigan, Smithsonian National Museum of Natural History. It shows the head, not the stem pieces you usually find on beaches: Smithsonian National Museum of Natural History, CC0 (museum specimen)
• Nucleocrinus elegans blastoids, Silica Formation, near Paulding, Ohio (not a Michigan specimen): James St. John, CC BY 2.0
• Fossil brachiopods in limestone, near Charlevoix: James St. John, CC BY 2.0
• Fossil gastropod in Columbus Limestone, Kelleys Island, Ohio (not a Michigan specimen): James St. John, CC BY 2.0
• Phacops rana trilobite, Silica Shale near Sylvania, Ohio (not a Michigan specimen): Dwergenpaartje, CC BY-SA 3.0
• Straight-shelled fossil nautiloid (Treptoceras), Upper Ordovician, northern Kentucky (not a Michigan specimen): James St. John, CC BY 2.0
• Pyritized brachiopod (Paraspirifer bownockeri), Silica Formation, Middle Devonian, northwestern Ohio (not a Michigan specimen): James St. John, CC BY 2.0
• Lepidodendron bark fossil, University of Michigan Museum of Natural History, Ann Arbor (where it was found is not stated, so it may not be a Michigan specimen): Daderot, Public domain (museum specimen)
• Holonema cf. farrowi armor plate, Presque Isle County, Michigan, Smithsonian National Museum of Natural History (USNM 23663; cropped to one of the two pieces): Smithsonian National Museum of Natural History, CC0 (museum specimen)
• Mastodon skeletons on display, University of Michigan Museum of Natural History (the male is a cast): WolfmanSF, CC BY-SA 4.0 (museum specimen)
• Shoreline near Copper Harbor (region photo, not a listed spot): chumlee10, CC BY-SA 2.0
• Petoskey State Park: Protopian Pickle Jar, CC BY-SA 2.0
• Pebble beach at Sable Falls, Lake Superior: National Park Service, Public domain
• Sandstone cliffs, Pictured Rocks National Lakeshore: National Park Service, Public domain
• Fossil coral (Hexagonaria), museum specimen: James St. John, CC BY 2.0
• Lake Superior shore near Grand Marais: Tony Webster from Minneapolis, Minnesota, CC BY-SA 2.0
• Shoreline near Presque Isle Park, Marquette (region photo, not a listed spot): The ed17, CC BY-SA 4.0
• Lake Superior beach at Muskallonge Lake State Park: Notorious4life, CC0
• Old quarry at Rockport State Recreation Area: DawnBreaksOverMarblehead, CC BY-SA 4.0
• Port Crescent State Park (region photo, not a listed spot): Notorious4life, CC0
• Ludington State Park beach (region photo, not a listed spot): Notorious4life, CC0

More photos in the rocks and fossils gallery

Photos marked CC0 or public domain need no credit; they are credited anyway. Smithsonian photos are CC0 and credited as a courtesy to the Smithsonian National Museum of Natural History. Public domain photos released by their authors are used only where the release is stated on the file page, noted below.

Native copper and float copper

• Native copper-coated cobble, Calumet and Hecla Mine, Calumet, museum display: James St. John, CC BY 2.0.
• Float copper boulder from Michigan, museum display at Tellus Science Museum, Georgia: JJonahJackalope, CC BY-SA 4.0.
• Native copper, Keweenaw Peninsula: John Mortimore, CC BY-SA 3.0.
• Glacial (float) copper boulder, near Houghton, museum display: James St. John, CC BY 2.0.

Native silver and half-breeds

• Copper-silver glacial cobble, Michigan, museum display: James St. John, CC BY 2.0.
• Copper-silver half-breed, Keweenaw Peninsula, museum display: James St. John, CC BY 2.0.
• Native silver, Osceola Mine, Keweenaw Peninsula, museum display: James St. John, CC BY 2.0.
• Native silver, Calumet, Houghton County, Smithsonian specimen: Courtesy of the Smithsonian National Museum of Natural History (photographer not named), CC0 1.0.

Lake Superior agate

• Lake Superior agate, Lake Superior shoreline, Upper Peninsula: James St. John, CC BY 2.0.
• Lake Superior agate nodule with visible bands, lake floor off the Keweenaw Peninsula: James St. John, CC BY 2.0.
• Beach pebbles at Agate Beach, Keweenaw Peninsula: xinem, CC BY 2.0.
• Cut and polished Lake Superior agate, Minnesota (not a Michigan specimen): Lech Darski, CC BY-SA 4.0.

Datolite

• Datolite, Isle Royale National Park, Keweenaw County: Robert M. Lavinsky, CC BY-SA 3.0.
• Polished datolite nodule, Keweenaw County: Robert M. Lavinsky, CC BY-SA 3.0.
• Slabbed datolite nodule, Centennial Mine, Houghton County: Robert M. Lavinsky, CC BY-SA 3.0.
• Sawed and polished datolite nodule, Quincy Mine, Hancock, Houghton County: Robert M. Lavinsky, CC BY-SA 3.0.

Thomsonite

• Sawed and polished thomsonite with eye pattern, Thomsonite Beach, Grand Marais, Minnesota (not a Michigan specimen): Robert M. Lavinsky, CC BY-SA 3.0.
• Thomsonite nodules in basalt; the photo title gives Grand Marais, Minnesota (not a Michigan specimen): Dave Dyet, Public domain. Released to the public domain by the author, as stated on the file page (all rights released).
• Small thomsonite eyes weathering out of basalt (locality not given; not a Michigan specimen): Mike Kestell, CC BY 2.0.

Prehnite and patricianite

• Native copper in prehnite, Osceola Mine, Houghton County: Robert M. Lavinsky, CC BY-SA 3.0.
• Raw and tumbled prehnite side by side (locality not given): Texas Lane, CC BY-SA 4.0.
• Native copper in prehnite, Franklin Mine, museum display: Pacific Museum of Earth from Canada, CC BY-SA 2.0.

Epidote

• Epidote-rich beach cobble, Nahant, Massachusetts (not a Michigan specimen): James St. John, CC BY 2.0.
• Unakite, a granite with epidote and pink feldspar (locality not given; not a Michigan specimen): James St. John, CC BY 2.0.

Calcite

• Calcite crystal with native copper, Upper Peninsula: James St. John, CC BY 2.0.
• Native copper inside a calcite crystal, Central Mine, Keweenaw Peninsula, museum display: James St. John, CC BY 2.0.

Jaspilite (banded iron formation)

• Cut and polished jaspilite, Ironwood Iron-Formation, Wakefield, Gogebic Range: James St. John, CC BY 2.0.
• Banded iron formation, west of Michigamme: James St. John, CC BY 2.0.
• Polished jaspilite slab from Michigan, Smithsonian specimen: Courtesy of the Smithsonian National Museum of Natural History (photographer not named), CC0 1.0.
• Banded iron formation, Dickinson County, Smithsonian specimen: Courtesy of the Smithsonian National Museum of Natural History (photographer not named), CC0 1.0.

Hematite and specularite

• Black botryoidal hematite, Ishpeming, museum display: James St. John, CC BY 2.0.
• Specularite (silvery hematite) layered with quartzite, Republic Mine, Marquette County: James St. John, CC BY 2.0.
• Kidney ore (botryoidal hematite) from Michigan, locality unknown. The yellow spot is lamp glare: DanielCD, CC BY-SA 3.0.
• Hematite, Marquette County, Smithsonian specimen: Courtesy of the Smithsonian National Museum of Natural History (photographer not named), CC0 1.0.

Quartz, amethyst, jasper and chert

• Tumble-polished jasper pebble (locality not given): Adrian Pingstone, Public domain. Released to the public domain by the author, as stated on the file page (May 2003).
• Cherty ironstone, Ironwood Formation, Upper Peninsula: Darla Sondrol, CC0 1.0.
• Beach cobble with a hollow lined with quartz crystals, Lake Superior shoreline, Upper Peninsula: James St. John, CC BY 2.0.
• Amethyst geode interior, southeastern Brazil (not a Michigan specimen): James St. John, CC BY 2.0.

Gold

• Placer gold pebbles, Washington State, museum display (not a Michigan specimen): James St. John, CC BY 2.0.
• Gold in a quartz vein, Geraldton, Ontario, museum display (not a Michigan specimen): James St. John, CC BY 2.0.

Diamonds and kimberlite

• Kimberlite: a garnet-bearing xenolith from the Lake Ellen Kimberlite, Iron County: James St. John, CC BY 2.0.
• Rough light brown diamond crystal, 3.7 mm, cut in half (locality not given): W.carter, CC BY-SA 4.0.
• Diamond in kimberlite, Kimberley, South Africa, museum display (not a Michigan specimen): James St. John, CC BY 2.0.

Gypsum, selenite and satin spar

• Clear selenite gypsum, 8 cm (locality not given): Darla Sondrol, CC0 1.0.
• Satin spar gypsum, near Derby, England (not a Michigan specimen): James St. John, CC BY 2.0.
• Alabaster, a fine-grained gypsum, from Michigan per the source description: Darla Sondrol, CC0 1.0.

Halite (rock salt)

• Rock salt, Salina Group, Detroit: James St. John, CC BY 2.0.
• Rock salt, Salina Group, Detroit (second sample): James St. John, CC BY 2.0.

Celestine and fluorite

• Celestine crystals, South Rockwood: James St. John, CC BY 2.0.
• Yellow sulfur crystals with celestine, Maybee, Monroe County: James St. John, CC BY 2.0.
• Celestine crystals, Holloway (Rockwood) Quarry, Monroe County: Robert M. Lavinsky, CC BY-SA 3.0.
• Fluorite with calcite, Newport Quarry, Monroe County: Robert M. Lavinsky, CC BY-SA 3.0.

Yooperlite® (sodalite syenite)

• Yooperlite cobble, about 7.6 cm, Lake Superior shoreline, Upper Peninsula: James St. John, CC BY 2.0.
• The same Yooperlites under UV light (top) and in normal light (bottom) (locality not given): TR15336300101, CC BY-SA 4.0.
• Yooperlite under UV light, with orange-glowing sodalite, Lake Superior shoreline, Upper Peninsula: James St. John, CC BY 2.0.

Puddingstone

• Large puddingstone boulder, Drummond Island: Corvair Owner, CC BY-SA 2.0.
• Jasper conglomerate, or St. Joseph Island puddingstone, St. Joseph Island, Ontario (not a Michigan specimen): Kdorse, CC BY-SA 3.0.
• Jasper-quartz pebble conglomerate, Lorrain Formation, Ontario, the bedrock source of puddingstone (not a Michigan specimen): James St. John, CC BY 2.0.
• Conglomerate with red jasper pebbles from Michigan, Smithsonian specimen: Courtesy of the Smithsonian National Museum of Natural History (photographer not named), CC0 1.0.

Granite and other glacial erratics

• Glacial erratic boulder, Bunker Nature Preserve, Aurelius Township, Ingham County: Tim Kiser, CC BY-SA 4.0.
• Mixed beach stones, Pictured Rocks National Lakeshore: National Park Service, Public domain.
• Granite pebble from a glacial-era lake deposit, west of Givens, Ohio (not a Michigan specimen): James St. John, CC BY 2.0.

Rhyolite

• Felsite (rhyolite) conglomerate with copper, Kingston Mine, Keweenaw County: James St. John, CC BY 2.0.
• Rhyolite conglomerate with native copper, Upper Peninsula: Darla Sondrol, CC0 1.0.
• Pink rhyolite (locality not given): Michael C. Rygel, CC BY-SA 3.0.

Basalt and amygdaloid

• Amygdaloidal basalt, Delaware Mine, Keweenaw: James St. John, CC BY 2.0.
• Copper-bearing amygdaloidal basalt, Keweenaw Peninsula, museum display: James St. John, CC BY 2.0.
• Ophite (ophitic basalt), Greenstone Flow, Keweenaw, Smithsonian specimen: Courtesy of the Smithsonian National Museum of Natural History (photographer not named), CC0 1.0.

Sandstone and Jacobsville Sandstone

• Jacobsville Sandstone, Jacobsville, museum display: Chris857, CC BY-SA 3.0.
• White Munising Formation over Jacobsville Sandstone, Pictured Rocks National Lakeshore: Chris857, CC BY-SA 3.0.
• Sandstone with fossil bivalves, Marshall Sandstone, near Jackson: James St. John, CC BY 2.0.
• Red sandstone, Houghton County, Smithsonian specimen: Courtesy of the Smithsonian National Museum of Natural History (photographer not named), CC0 1.0.

Limestone and dolomite (dolostone)

• Charlevoix Limestone, Sunset Park, Petoskey: James St. John, CC BY 2.0.
• Stromatolitic dolostone, Kona Dolomite, Lindberg Quarry, Marquette: James St. John, CC BY 2.0.
• Arch Rock, a limestone breccia arch on Mackinac Island: Hitsandmisses1, CC BY-SA 4.0.
• Limestone, Saginaw County, Smithsonian specimen: Courtesy of the Smithsonian National Museum of Natural History (photographer not named), CC0 1.0.

Gneiss, schist, slate and quartzite

• Watersmeet Gneiss, about 3.56 billion years old, Watersmeet, museum display: James St. John, CC BY 2.0.
• Chlorite schist, Michigamme Mine area, Upper Peninsula: James St. John, CC BY 2.0.
• Quartzite, Marquette South Outcrop: James St. John, CC BY 2.0.

Michigan coal

• Bituminous coal (locality not given): Nessa Eull, CC0 1.0.
• Bituminous coal close-up (locality not given): Amcyrus2012, CC BY 4.0.

Lightning stones

• Septarian concretion, Ohio Shale, Columbus, Ohio (not a Michigan specimen): James St. John, CC BY 2.0.
• Cut septarian nodule, San Juan County, Utah, museum display (not a Michigan specimen): Tony Hisgett, CC BY 2.0.
• Septarian nodule, Nacimiento Mine, New Mexico (not a Michigan specimen): Kent G. Budge, CC0 1.0.

Meteorites

• Small iron meteorite, 5 cm, 77 g (locality not given): Jud McCranie, CC BY-SA 4.0.
• NWA 6927 meteorite from Northwest Africa, with black fusion crust (not a Michigan specimen): Jon Taylor, CC BY-SA 2.0.
• Rose City meteorite, which fell in Ogemaw County in 1921, Smithsonian specimen: Courtesy of the Smithsonian National Museum of Natural History (photographer not named), CC0 1.0.

Petoskey stone

• Wet stones, including Petoskey stones, Good Harbor Bay: Debchristiansen, CC BY-SA 4.0.
• Rough, unpolished Petoskey stones from Michigan: Adam Kelliher / Rubble Rock and Gem, CC BY-SA 4.0.
• Hexagonaria coral, Lake Michigan shoreline near Bay View, museum display: James St. John, CC BY 2.0.
• Polished Petoskey stone, Leelanau County, Smithsonian specimen: Courtesy of the Smithsonian National Museum of Natural History (photographer not named), CC0 1.0.

Charlevoix stone (Favosites)

• Polished Favosites, Iowa City, Iowa, museum display (not a Michigan specimen): Tim Evanson, CC BY-SA 2.0.
• Favosites with petroleum, Dundee Formation, Paulding County, Ohio (not a Michigan specimen): James St. John, CC BY 2.0.

Horn corals

• Horn coral Siphonophrentis gigantea, White Sulphur, Ohio, museum display (not a Michigan specimen): James St. John, CC BY 2.0.
• Horn coral Heliophyllum halli, Bethany Center, New York (not a Michigan specimen): Wilson44691, CC0 1.0.
• Weathered-out horn corals, Richmond, Indiana (not a Michigan specimen): Jstuby, CC0 1.0.

Pipe and chain corals

• Polished Halysites chain coral, Gotland, Sweden (not a Michigan specimen): Hannes Grobe/AWI, CC BY 4.0.
• Weathered Halysites chain coral, Fairborn, Ohio, museum display (not a Michigan specimen): James St. John, CC BY 2.0.
• Halysites chain coral close-up (locality not given): Wilson44691, Public domain. Released to the public domain by the author, as stated on the file page (PD-self).

Stromatoporoids (sponges)

• Stromatoporoid cross-section, Sunset Park, Petoskey: James St. John, CC BY 2.0.
• Stromatoporoid, Sunset Park, Petoskey: James St. John, CC BY 2.0.
• Stromatoporoid, Emmet County, Smithsonian specimen: Courtesy of the Smithsonian National Museum of Natural History (photographer not named), CC0 1.0.
• Stromatopora, Emmet County, Smithsonian specimen: Courtesy of the Smithsonian National Museum of Natural History (photographer not named), CC0 1.0.

Bryozoans

• Branching bryozoan colony, Frankfort, Illinois (not a Michigan specimen): James St. John, CC BY 2.0.
• Archimedes, a screw-shaped bryozoan, in limestone (locality not given): James St. John, CC BY 2.0.
• Bryozoan pieces in limestone, Warren County, Ohio (not a Michigan specimen): James St. John, CC BY 2.0.

Crinoids (sea lilies)

• Beach-found crinoid stem pieces, Alliklepa beach, Estonia (not a Michigan specimen): ErikAbner, CC BY 4.0.
• Crinoid stem pieces in limestone, Saaremaa, Estonia (not a Michigan specimen): ErikAbner, CC BY 4.0.
• Complete crinoid crown, Arthroacantha, Silica Shale, Sylvania, Ohio, museum display (not a Michigan specimen): James St. John, CC BY 2.0.

Blastoids

• Blastoid head, Elaeacrinus, Columbus Limestone, Ohio (not a Michigan specimen): James St. John, CC BY 2.0.
• Pentremites blastoid, Kentucky (not a Michigan specimen): James St. John, CC BY 2.0.
• Pentremites blastoid, bottom view; the file gives Kentucky and Illinois (not a Michigan specimen): Wilson44691, CC0 1.0.

Brachiopods

• Pentamerid brachiopod, Schoolcraft Dolomite, Garden Peninsula: James St. John, CC BY 2.0.
• Pentamerid brachiopods, Schoolcraft Dolomite, Garden Peninsula: James St. John, CC BY 2.0.
• Spirifer brachiopod valve, 18 mm, collected in the Michigan area: Dwergenpaartje, CC BY-SA 3.0.
• Leptaena brachiopod in limestone, Columbus, Ohio (not a Michigan specimen): James St. John, CC BY 2.0.

Fossil snails (gastropods)

• Fossil snail Euryzone in Dundee Limestone, Ohio (not a Michigan specimen): James St. John, CC BY 2.0.
• Beach-found fossil snails, Ontika beach, Estonia (not a Michigan specimen): ErikAbner, CC BY 4.0.
• Fossil snails with a pencil for scale, from a Glacier National Park photo set (not a Michigan specimen): Glacier National Park (National Park Service), Public domain.

Trilobites

• Trilobite Eldredgeops, Silica Shale, Sylvania, Ohio, museum display (not a Michigan specimen): Daderot, CC0 1.0.
• Trilobite Phacops rana, Silica, Ohio, museum display (not a Michigan specimen): Daderot, CC0 1.0.
• Trilobite Phacops rana, Silica Formation, Ohio, museum display (not a Michigan specimen): James St. John, CC BY 2.0.

Nautiloids

• Beach-found nautiloid, Ontika beach, Estonia (not a Michigan specimen): ErikAbner, CC BY 4.0.
• Straight-shelled nautiloid showing its chambers (locality not given): James St. John, CC BY 2.0.
• Polished straight-shelled nautiloids (orthocones) (locality not given): Deidre Woollard, CC BY 2.0.

Pyritized fossils

• Pyritized brachiopod Paraspirifer, Silica Formation, Ohio (not a Michigan specimen): James St. John, CC BY 2.0.
• Pyritized corals on a Paraspirifer brachiopod, Silica Formation, Ohio (not a Michigan specimen): James St. John, CC BY 2.0.
• Pyritized ammonite, Charmouth Beach, England (not a Michigan specimen): Partonez, CC BY-SA 4.0.

Coal-swamp plant fossils (Calamites, Lepidodendron, Stigmaria)

• Lepidodendron bark scales, Stevenston Beach, Scotland (not a Michigan specimen): Rosser1954, CC BY-SA 4.0.
• Stigmaria, a Lepidodendron root, Stevenston Beach, Scotland (not a Michigan specimen): Rosser1954, CC BY-SA 4.0.
• Lepidodendron trunk with its scaly bark pattern, Kentucky, museum display (not a Michigan specimen): James St. John, CC BY 4.0.
• Calamites stem, Wrexham Museum, Wales, museum display (not a Michigan specimen): Rept0n1x, CC BY-SA 3.0.

Devonian armored fish plates (placoderms)

• Dunkleosteus head armor, a cast, Cleveland Shale, Ohio, museum display (not a Michigan specimen): James St. John, CC BY 2.0.
• Holonema armor plate, Silica Formation, Paulding, Ohio, museum display (not a Michigan specimen): James St. John, CC BY 2.0.
• Arthrodire lower tooth plate, Silica Formation, Paulding, Ohio, museum display (not a Michigan specimen): James St. John, CC BY 2.0.

Mastodon (state fossil) and mammoth

• Mastodon tooth, Mattapoisett River, Massachusetts, museum display (not a Michigan specimen): Daderot, CC0 1.0.
• Mastodon molar, Cleveland, Ohio, museum display (not a Michigan specimen): Tim Evanson, CC BY-SA 2.0.
• The Buesching mastodon skeleton, found in Indiana, museum display at the University of Michigan (not a Michigan specimen): Daderot, Public domain. Released to the public domain by the author, as stated on the file page.
• Mastodon lower jaw, Shelton Mastodon site, Oakland County, museum display: James St. John, CC BY 2.0.

Map

• Michigan map traced from US Census Bureau cartographic boundary files (cb_2023_us_county_500k), public domain; regions are approximate county groupings made for this site.