Updated August 2026
38 mapped spots across 24 counties. Ohio produces a wide range of rockhounding-grade material: see the full list of spots, minerals, and access notes below.
The best rockhounding in Ohio is at Conneaut in Ashtabula County (calcite), Coshocton County in Coshocton County (dark gray flint, black flint), and Lawrence County in Lawrence County (flint nodules). In total, 38 mapped collecting spots across 24 counties produce fossils, pyrite, and celestite, each listed below with coordinates and land access notes.
Representative spot and material photos from locations in this state, shown where verified public image records are available.
Map showing 38 rockhounding spots in Ohio
Counts reflect how many spots in this list mention each mineral.
Day-trip range. Each section lists the closest mapped rockhounding spots within about 150 miles of the city — most are inside a 2 to 3 hour drive.
6 closest spots to Columbus, OH.
6 closest spots to Cleveland, OH.
6 closest spots to Cincinnati, OH.
Geology rarely respects state borders. These states share mapped rockhounding country with Ohio — useful when Ohio is the start, not the whole trip. Each card links to the closest county across the line.
County pages are linked once we have at least 3 mapped spots for a focused guide with coordinates, mineral notes, and nearby spots.
Hand-picked standouts from the Ohio list, chosen for unusual mineralogy, documented public access, or both. Each card links to coordinates, access notes, and what to look for.
Top pickAshtabula County
Conneaut sits at Ohio's northeast corner where the Lake Erie shore mixes glacial erratics, well-tumbled quartz and jasper pebbles, Devonian shale fossils, and the frosted beach glass the eastern lakeshore is known for.
Calcite
Top pickCoshocton County
Coshocton County is the home of Upper Mercer flint, the glossy blue-black, white-flecked chert that flint knappers prize above almost any other Ohio material and still gather at the annual Coshocton Flint Festival and Knap-In.
Dark Gray Flint, Black Flint
Top pickLawrence County
At Ohio's southern tip the Ohio River rolls up gravel bars carrying flint nodules, chert, jasper, and quartz eroded and reworked from the Appalachian bedrock upstream.
Flint Nodules
Top pickLicking County
Flint Ridge is the source of Ohio flint, the state's official gemstone since 1965, a Vanport chert that runs in vivid reds, pinks, blues, and greens found almost nowhere else at this quality.
Agate, Amethyst, Carnelian, Chalcedony
Top pickLucas County
This five-acre former Medusa cement quarry, now the Olander Park District's Fossil Park, is set into the Middle Devonian Silica Formation, a shale famous worldwide for beautifully preserved trilobites and more than 200 species of marine invertebrates about 375 million years old.
Fossils
Top pickTuscarawas County
The Tuscarawas River near the historic village of Zoar carries flint and chert cobbles, including Upper Mercer material, worked down from the surrounding Pennsylvanian bedrock and glacial deposits into workable gravel bars.
Flint
Top pickWarren County
The emergency spillway below Caesar Creek dam cut through Upper Ordovician bedrock and exposed one of the richest fossil beds in the eastern United States, packed with brachiopods, bryozoans, crinoids, horn corals, and the trilobite Isotelus, the animal Ohio adopted as its state invertebrate fossil.
Fossils, Trilobites, Brachiopods, Crinoids
Top pickHamilton County
A graded hillside at Trammel Fossil Park lays bare several formations of Upper Ordovician Cincinnatian limestone and shale, over 440 million years old, in a suburb of the city that gives the Cincinnatian Series its name.
Fossils, Trilobites, Brachiopods, Crinoids
Top pickGreene County
Oakes Quarry Park exposes the Silurian Brassfield Formation, roughly 440 million years old, and preserves two ancient patch reefs that have yielded 29 species of crinoids, some among the largest ever described.
Fossils, Crinoids, Brachiopods, Corals
Top pickPreble County
Hueston Woods is one of the few Ohio state parks that permits fossil collecting, and it is regarded as one of the best places in the world to find Upper Ordovician fossils.
Fossils, Trilobites, Brachiopods, Bryozoans
Sorted by county. Tap coordinates to open in Google Maps, or open RockHoundR for the full map view with land overlays and weather.
Open the RockHoundR app to see Ohio on a real map with public land overlays, weather, geology, and your saved finds.
