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Charles Mears State Park Beach: Fossil Hunting in Oceana County, Michigan

Updated June 2026

Charles Mears State Park puts almost 2,000 feet of Lake Michigan beach within easy reach in Pentwater, where wave-sorted gravel turns up Petoskey stones and other glacially transported Great Lakes specimens. The shoreline below the ordinary high-water mark is public land, so beachcombing is broadly allowed along the water's edge. It is one of the more accessible west-coast beaches for casual collectors. Reported finds include petoskey stones, agate, fossils. Below: coordinates, access notes, nearby spots, and trip-planning links.

Charles Mears State Park Beach photos

Public image records connected to this spot or its reported material.

1 photo

A natural Petoskey stone (Hexagonaria coral) from a Lake Michigan beach

Quick details

Access: Public area
County: Oceana County
State: Michigan
Nearest road: North Lakeshore Drive
Coordinates: 43.73433, -86.47290

Geology at Charles Mears State Park Beach

This spot sits on Coldwater Shale, mapped as shale that formed roughly 360 to 325 million years ago. Sedimentary layers like these are where fossils are typically preserved, and fresh exposures after rain or in active cuts tend to produce best.

Mapped unit: Coldwater Shale
Age: 360–325 Ma (Mississippian)
Rock types: shale
Elevation: 580 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 Charles Mears State Park Beach

Best months: April to November. Typical highs run 81°F in midsummer and 30°F in midwinter, with winter lows near 17°F.

Climate normals: NOAA 1991-2020 monthlies, HART 3 WSW station (5 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.

State guidance last verified: April 1, 2026

Michigan DNR — Rockhounding rules
Michigan Geological Survey
Isle Royale National Park — Rules
Community submissions reviewed against published agency rules

Found at Charles Mears State Park Beach

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 Charles Mears State Park Beach.

Across the state line from Charles Mears State Park Beach

Charles Mears State Park Beach is close enough to the Michigan border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Charles Mears State Park Beach FAQ

Where is Charles Mears State Park Beach?+

Charles Mears State Park Beach is in Oceana County, Michigan, at 43.73433, -86.47290. Nearest road: North Lakeshore Drive.

What rocks and minerals can you find at Charles Mears State Park Beach?+

Charles Mears State Park Beach is reported to produce Petoskey Stones, Agate, Fossils.

Is collecting allowed at Charles Mears State Park Beach?+

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 Charles Mears State Park Beach?+

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 Charles Mears State Park Beach?+

The most comfortable months at Charles Mears State Park Beach are April to November.

How do I get to Charles Mears State Park Beach?+

Open the directions link to navigate to 43.73433, -86.47290 in Google Maps. The nearest road is North Lakeshore Drive.

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