Welcome to the Ohio Governor's Residence Museum and Heritage Gardens
Fun Facts About Ohio'S Geological History

  1. The oldest exposed rocks found in Ohio were deposited here 470 million years ago.

  2. Flint is the official gemstone of Ohio. It originated in sea sponges that fell to the sea floor in pre-historic times. The sponges' openings were filled with mud or sand and then compressed over time. Flint was used by Native Americans to shape spear points, knives and other tools.

  3. Want to collect a million seashells? Pick up a piece of limestone rock. Limestone was formed from the remains of seashells. Many prestigious and architecturally significant buildings and monuments in Ohio are made from limestone.

  4. The trilobite Isotelus is Ohio's state fossil. Many states have a state fossil.

  5. Sandstone found in Ohio's Berea layer of the earth is known for three amazing things. First, it holds oil between its course grains. (Oil is a substance formed by sea creatures that decomposed in the absence of oxygen.) By 1886 more that 2,000 wells were drilled in eastern Ohio. Second, sandstone is a perfect material to make grindstones. In the 1870s, the Berea layer produced more than 75 percent of the world's entire supply. Grindstones were shipped to Australia, Japan and South America. Third, buildings throughout North American are made from this important stone.

  6. More than 80 percent of the electricity Ohioans use is made by burning coal, a fossil fuel.

  7. About 290 million years ago a huge rock from space cashed into what is now Adams County in southern Ohio, shattering rocks in a five mile diameter. Rock layers at the center were pushed into the earth and then bounced back up. Those formations are now a 1,000 feet above their original position.

  8. Much to the disappointment of grade-school dinosaur lovers everywhere in Ohio, the state can't boast of any dinosaur bones or fossils found here. During the age of dinosaurs, massive erosion occurred here, preventing bones from being buried and turning into fossils. But we have great trilobite fossils.

  9. Mammoths and mastodons, two elephant-like creatures, roamed Ohio during the Ice Age.

  10. The rare and endangered Lakeside Daisy grows in only a few locations near the Great Lakes shores of the United States and Canada. The plant can be seen at the Lakeside Daisy State Nature Preserve on the Marblehead Peninsula on Lake Erie. The flower grows on an alvar, a shallow soil system over limestone.
(SOURCE: Ohio Governor's Residence and Heritage Gardens; Geologic Walk Guide and Companion Educational Materials)
Ohio Governor’s Residence and Heritage Garden
358 North Parkview Ave., Columbus, Ohio 43209
Phone: 614-644-7644 Fax: 614-252-7076