Green Park: Charlevoix Stone & Honeycomb Coral Rockhounding in Ontonagon County, Michigan
- Minerals reported
- 6
- Elevation
- 610 ft
- Best months
- April to October
Green Park is a mapped rockhounding spot in Ontonagon County, Michigan. Reported finds include charlevoix stone, honeycomb coral, rhyolite, quartz, lake superior agate, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.
Plan your visit
Generally open to casual rockhounding
- County
- Ontonagon County
- State
- Michigan
- Coordinates
- 46.83896, -89.43599
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.
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 Green Park
Comfortable months (45 to 90°F highs)
Best months: April to October. Typical highs run 80°F in midsummer and 26°F in midwinter, with winter lows near 9°F.
Climate normals: NOAA 1991-2020 monthlies, ONTONAGON 6 SE station (11 mi away), adjusted for elevation.
Geology at Green Park
This spot sits on Oronto Group; Freda Sandstone, mapped as shale, siltstone, and arkose that formed roughly 1600 to 1000 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
- Oronto Group; Freda Sandstone
- Age
- 1600–1000 Ma (Mesoproterozoic)
- Rock types
- shale, siltstone, and arkose
- Elevation
- 610 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.
Today's weather
Is today a good day to go?
The app shows live weather, recent rain, and a daily rockhounding score for Green Park.
Get the appSources & 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:
- Michigan DNR, Rockhounding rules
- Michigan Geological Survey
- Isle Royale National Park, Rules
- Community submissions reviewed against published agency rules
Found at Green Park
Each name 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 Green Park.
- Lake Superior Beach (Ontonagon)Ontonagon County, Michigan · 5 mi awayKeweenaw Agate, Thomsonite, Chalcedony
- Gull PointOntonagon County, Michigan · 5 mi awayKeweenaw Agate
- Union Bay CampgroundOntonagon County, Michigan · 10 mi away
- Caledonia MineOntonagon County, Michigan · 16 mi awayNative Copper, Datolite
- Agate Beach ParkHoughton County, Michigan · 28 mi awayUnakite, Chert, Quartz
- Black River HarborGogebic County, Michigan · 31 mi away
- Maple CreekGogebic County, Michigan · 35 mi awayGranite, Agate, Banded Iron Formation
- Little Girls Point County ParkGogebic County, Michigan · 45 mi awayBasalt, Granite, Unakite
Across the state line from Green Park
Green 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.
- Iron CountyIron County, Wisconsin · 44 mi awayCopper
- Iron CountyIron County, Wisconsin · 47 mi awayAgate, Jasper
- Montreal MineIron County, Wisconsin · 47 mi awayActinolite, Barite, Selenite
- Near Saxon FallsIron County, Wisconsin · 49 mi awayCalcite, Chlorite, Epidote
- Saxon Harbor County ParkIron County, Wisconsin · 51 mi awayLake Superior Agate, Jasper, Copper
- Sandy Beach & Mud LakesIron County, Wisconsin · 56 mi awayAlmandite, Kyanite, Staurolite
Green Park FAQ
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More rockhounding in Michigan
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Open Green Park on the map
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