Pier Cove Park: Lightning Stone & Quartz Rockhounding in Allegan County, Michigan

Updated August 2026

Pier Cove Park is a mapped rockhounding spot in Allegan County, Michigan. Reported finds include lightning stone, quartz, unakite, horn coral, chert, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Allegan County
State: Michigan
Coordinates: 42.58587, -86.22667

Geology at Pier Cove Park

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: 600 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 Pier Cove Park

Best months: March to November. Typical highs run 82°F in midsummer and 32°F in midwinter, with winter lows near 20°F.

Climate normals: NOAA 1991-2020 monthlies, HOLLAND TULIP CITY AP station (13 mi away).

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 Pier Cove Park

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 Pier Cove Park.

Across the state line from Pier Cove Park

Pier Cove Park 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.

Pier Cove Park FAQ

Where is Pier Cove Park?+

Pier Cove Park is in Allegan County, Michigan, at 42.58587, -86.22667.

What rocks and minerals can you find at Pier Cove Park?+

Pier Cove Park is reported to produce Lightning Stone, Quartz, Unakite, Horn Coral, Chert, Yooperlite, Crinoid, Slag.

Is collecting allowed at Pier Cove Park?+

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 Pier Cove Park?+

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 Pier Cove Park?+

The most comfortable months at Pier Cove Park are March to November.

How do I get to Pier Cove Park?+

Open the directions link to navigate to 42.58587, -86.22667 in Google Maps. Some spots are remote, so check road conditions before driving out.

More rockhounding in Michigan

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Open Pier Cove Park on the map

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