Clay Center limestone quarry: Calcite & Celestite Rockhounding in Ottawa County, Ohio

Updated June 2026

Clay Center limestone quarry is a mapped rockhounding spot in Ottawa County, Ohio. Reported finds include calcite, celestite, dolomite, fluorite, pyrite, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Ottawa County
State: Ohio
Nearest road: North Bolander Road
Postcode: 43408
Coordinates: 41.57435, -83.36351

Geology at Clay Center limestone quarry

This spot sits on Lockport Dolomite, mapped as dolostone that formed roughly 445 to 425 million years ago. Limestone like this typically forms in ancient seas, so marine fossils such as brachiopods, corals, and crinoids tend to weather out of fresh exposures.

Mapped unit: Lockport Dolomite
Age: 445–425 Ma (Llandovery to Ludlow)
Rock types: dolostone
Elevation: 450 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.

Best time to visit Clay Center limestone quarry

Best months: March to November. Typical highs run 85°F in midsummer and 34°F in midwinter, with winter lows near 21°F.

Climate normals: NOAA 1991-2020 monthlies, TOLEDO METCALF FLD station (6 mi away), adjusted for elevation.

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.

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.

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.

Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.

Found at Clay Center limestone quarry

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

Nearby rockhounding spots

Other rockhounding spots within driving distance of Clay Center limestone quarry.

Across the state line from Clay Center limestone quarry

Clay Center limestone quarry is close enough to the Ohio border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

William C. Sterling State ParkMonroe County, Michigan · 24 mi away

Clay Center limestone quarry FAQ

Where is Clay Center limestone quarry?+

Clay Center limestone quarry is in Ottawa County, Ohio, at 41.57435, -83.36351. Nearest road: North Bolander Road.

What rocks and minerals can you find at Clay Center limestone quarry?+

Clay Center limestone quarry is reported to produce Calcite, Celestite, Dolomite, Fluorite, Pyrite, Fossils.

Is collecting allowed at Clay Center limestone quarry?+

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. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Clay Center limestone quarry?+

A rock hammer, a cold chisel, safety glasses, and newspaper or foam for wrapping finds cover most fossil ground. A trowel and a sieve help in soft exposures.

When is the best time to visit Clay Center limestone quarry?+

The most comfortable months at Clay Center limestone quarry are March to November.

How do I get to Clay Center limestone quarry?+

Open the directions link to navigate to 41.57435, -83.36351 in Google Maps. The nearest road is North Bolander Road.

More rockhounding in Ohio

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Open Clay Center limestone quarry on the map

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