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Minerals, rocks, fossils, mammoth tusks, maps and more!

Ed Clark Museum of Missouri GeologyWe welcome visitors weekdays from 8 a.m. to 5 p.m. Admission is free. We are located at 111 Fairgrounds Road, Rolla. While here, be sure to pick up some of our free literature. We also sell Missouri geologic and topographic maps, along with a variety of technical and general-interest maps, publications, books and rock and mineral sets at our sales counter in the Buehler Building, located in Rolla at 111 Fairgrounds Road. You also can download many items from The Missouri Geology Store, free of charge.

Self-guided tours

Self-guided tours are available to the public weekdays from 8 a.m. to 5 p.m. Admission is free! We are closed state and federal holidays.
Click to see mapMissouri Department of Natural Resources
Missouri Geological Survey
111 Fairgrounds Road, Rolla

Take I-44 Exit 184 and continue through both roundabouts to Kingshighway. Turn left on Fairgrounds Road (will pass Buehler Park). We are located just beyond the park and car wash, across from the automobile dealership.

Don't miss seeing the meteorite that was found in Missouri

Check out the thin slice of an iron meteorite that was found near Licking, Missouri.

See a replica of the Official Missouri Dinosaur and bones

Hypsibema missouriensis. Hypsibema missouriensis was first discovered in 1942 when Dan Stewart, one of our geologists was working near the town of Glen Allen in Bollinger County. Dan was investigating clay deposits in the area when a local family told him about clay they had encountered in a recently dug well.  When Dan arrived at the location, he was shown several bones that had been found in the clay. These bones were sold to the Smithsonian but it was not until the 1980s that the dinosaur was correctly identified as a hadrosaur or “duck billed” dinosaur. The herbivore (a plant eating dinosaur)had jaws that contained more than 1,000 teeth. Hypsibema had evolved specialized teeth to handle the tough, fibrous vegetation of the time. Hypsibema lived in Missouri during the late Cretaceous period around 75 million years ago and became the state’s official dinosaur on July 9, 2004. Learn more about the official state dinosaur from the Bollinger County Museum of Natural History website.  Other state symbols may be found on the Secretary of State’s website. Read more about the official state dinosaur and other state symbols in our Missouri Resources Magazine.

Visitors packing rocks

Ask a Geologist

Children and adults often bring rocks and other items to our museum and ask for a geologist to examine and properly identify them.  If you can't visit, but want to send a photo of your find or a question to us, please send email to

We encourage visitors to stop by so we can help. We are open weekdays from 8 a.m. to 5 p.m. Our museum is closed state and federal holidays.

Crinoid fossil in chert

Dave Bridges and Meghan Cox with Meghan's crinoid fossilRolla resident Meghan Cox, her sister Sammee, and her grandmother visited the museum and Meghan (who wants to be a paleontologist), brought a number of rocks and fossils to be identified by Dave Bridges, MGS geologist. One special rock, made of chert, contained the fossil of a crinoid, the Missouri state fossil. Read more about it and other fossils. Download a full-color booklet that describes the most common rocks in Missouri, and learn about their uses.

Crinoid fossil in limestone

Nine-year-old Joseph Daniel "J.D." James, Slater, and his grandmother Nadra Curtis, Edgar Springs brought a large piece of chert they believed contained a fossil. J.D., a third-grade student, found the specimen in Hannibal. Nadra told Hylan Beydler, MGS Information Officer that J.D. has wanted to be a paleontologist since the age of five years. The boy was delighted when Pat Mulvany, MGS geologist, told them it was a fossil. His eyes seemed to grow larger as Mulvany and Dave Bridges, MGS geologist, described the fossil as a Crinoid, Missouri’s official state fossil. Mulvany told J.D. the width of the fossil was very impressive and when he indicated it was the largest (width-wise) he had ever seen J.D. was understandably ecstatic! Read more about it and other fossils. Download a full-color booklet that describes the most common rocks in Missouri, and learn about their uses.

JD James Hannibal Crnioid