Coshocton County: Dark Gray Flint & Black Flint Rockhounding in Coshocton County, Ohio

Plan your visit

Generally open to casual rockhounding

County

Coshocton County

State

Ohio

Nearest road

County Road 55

Postcode

43812

Coordinates

40.27841, -81.90901

Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.

Land & collecting status

Generally open to casual rockhounding

Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.

Access note: Free surface collecting is realistic on public stream gravel bars below the ordinary high-water mark of the Walhonding, Tuscarawas, and Muskingum river systems, reached from public accesses. Old Upper Mercer quarry outcrops and fields on private land require the landowner's permission.

Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.

Best time to visit Coshocton County

Comfortable months (45 to 90°F highs)

Best months: March to November. Typical highs run 82°F in midsummer and 36°F in midwinter, with winter lows near 19°F.

Climate normals: NOAA 1991-2020 monthlies, COSHOCTON WPC PLT station (3 mi away), adjusted for elevation.

Geology at Coshocton County

This spot sits on Allegheny and Pottsville Groups, Undivided, mapped as shale and siltstone that formed roughly 325 to 300 million years ago. Sedimentary rock like this erodes unevenly, so the most productive collecting is typically along fresh cuts, badland slopes, and active drainages.

Mapped unit

Allegheny and Pottsville Groups, Undivided

Age

325–300 Ma (Pennsylvanian)

Rock types

shale and siltstone

Elevation

1,060 ft

Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.

Sources & verification

Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.

• Ohio Geological Survey
• Ohio State Parks rules
• Wayne National Forest
• Community submissions reviewed against published agency rules