Negwegon State Park: Puddingstone & Petoskey Stone Rockhounding in Alcona County, Michigan
- Minerals reported
- 7
- Elevation
- 610 ft
- Best months
- April to October
Negwegon State Park is a mapped rockhounding spot in Alcona County, Michigan. Reported finds include puddingstone, petoskey stone, granite, gneiss, quartz, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.
Plan your visit
Pay-to-dig site
- County
- Alcona County
- State
- Michigan
- Coordinates
- 44.85515, -83.32462
Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.
Land & collecting status
Pay-to-dig site
This is a fee-dig location. Hours, prices, and what you can keep vary by operator. Call ahead before driving out.
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 Negwegon State Park
Comfortable months (45 to 90°F highs)
Best months: April to October. Typical highs run 74°F in midsummer and 26°F in midwinter, with winter lows near 14°F.
Climate normals: NOAA 1991-2020 monthlies, HARRISVILLE SP station (14 mi away).
Geology at Negwegon State Park
This spot sits on Antrim Shale, mapped as black shale that formed roughly 385 to 360 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
- Antrim Shale
- Age
- 385–360 Ma (Late Devonian)
- Rock types
- black shale
- 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
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The app shows live weather, recent rain, and a daily rockhounding score for Negwegon State 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 Negwegon State 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 Negwegon State Park.
- Sturgeon Point LighthouseAlcona County, Michigan · 10 mi awayGranite, Chert, Fossil
- Partridge PointAlpena County, Michigan · 12 mi awayCrinoid, Brachiopod, Horn Coral
- Harrisville State ParkAlcona County, Michigan · 14 mi awayGranite, Chert, Quartz
- Rockport Recreation AreaAlpena County, Michigan · 24 mi awayPetoskey Stone, Fossilized Coral, Brachiopod
- Besser Natural AreaPresque Isle County, Michigan · 27 mi away
- Presque Isle ShorelinePresque Isle County, Michigan · 36 mi awayAgate, Chalcedony Geode, Sandstone With Calcite Vein
- Thompson's Harbor State ParkPresque Isle County, Michigan · 37 mi awayGranite, Gneiss, Quartz
- Tawas Point State ParkIosco County, Michigan · 42 mi awayQuartz, Granite, Gneiss
Negwegon State Park FAQ
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