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Fossil Hunting in Maine

advanced friendly Plant fossilsBrachiopodsGraptolitesCoral fragments

Maine is one of the more challenging states for fossil collecting in the eastern United States. Intense metamorphism has destroyed fossils in much of the state’s bedrock, but a handful of important localities preserve Devonian plant fossils and Silurian marine life.

Why Maine?

Maine’s geological history has not been kind to fossils. Most of the state’s bedrock has been heavily metamorphosed — heated and compressed during ancient mountain-building events — which destroyed the original fossil content. However, pockets of less-deformed rock survive, particularly in northern Maine’s Aroostook County and in the area around Baxter State Park. These localities preserve important Devonian plant fossils, including some of the earliest known land plants, and Silurian marine invertebrates. For collectors who enjoy a challenge and appreciate scarcity, Maine offers a unique and rewarding experience.

What You’ll Find

Devonian plant fossils (~390 million years old):

  • Pertica quadrifaria — an early vascular land plant and one of Maine’s most significant fossils
  • Other primitive plant impressions and compressions in sandstone

Silurian marine fossils (~420-440 million years old):

  • Brachiopods preserved in limestone and sandstone in Aroostook County
  • Occasional corals, crinoid fragments, and graptolites
  • Trilobite fragments (rare)

Best Time to Visit

  • Summer (June-September): The only practical season — northern Maine winters are long and severe
  • After spring thaw: Freeze-thaw weathering and runoff expose fresh surfaces
  • Dry periods: Stream levels drop, improving access to creek bed exposures

Tips for Maine Collecting

  1. Get permission first — nearly all productive sites are on private timberland
  2. Be prepared for remote conditions — northern Maine is sparsely populated with limited services
  3. Bring insect repellent — blackflies and mosquitoes in Maine woods are legendary
  4. Manage expectations — fossils are genuinely scarce; a few good brachiopods is a successful trip
  5. Contact the Maine Geological Survey for guidance on accessible localities

Collecting Sites

Trout Valley (Baxter State Park vicinity)

Private (Permission Needed)

Piscataquis County

The type locality for Pertica quadrifaria, one of the earliest known land plants, preserved in Devonian sandstones. Most exposures are on private timberland — permission is required. Baxter State Park itself prohibits collecting.

Devonian plant fossilsPertica quadrifaria

Aroostook County Silurian Limestones

Private (Permission Needed)

Northern Aroostook County

Patches of less-metamorphosed Silurian limestone in far northern Maine preserve marine invertebrate fossils. Road cuts and quarry exposures are the primary access points. Most land is privately owned timberland.

BrachiopodsCoralsCrinoid stems

Chapman Sandstone Exposures

Private (Permission Needed)

Chapman, Aroostook County

Silurian-age marine fossils in road cuts and stream exposures near Chapman. This is one of the more accessible Silurian fossil-bearing localities in the state.

BrachiopodsTrilobite fragmentsGraptolites

Jasper Beach

Free Public Access

Machiasport, Washington County

While not a fossil site per se, this remarkable cobble beach of volcanic rhyolite occasionally yields rocks with vague organic-looking structures. More of a geological curiosity than a fossil locality, but worth a visit for rock enthusiasts.

Volcanic jasper cobbles (not true fossils)

Legal Rules for Maine

Maine has very few public fossil collecting sites. Most productive localities are on private timberland — always get permission from the landowner or timber company. State parks and Baxter State Park prohibit collecting. The Trout Valley plant fossil locality is scientifically significant and should be treated with respect. Report any unusual vertebrate or significant plant fossil finds to the Maine State Museum or Maine Geological Survey.

Read our full legal guide for federal laws and more details.

Key Geological Formations

  • Trout Valley Formation (Devonian)
  • Seboomook Formation (Devonian)
  • Silurian limestones (Aroostook County)
  • Chapman Sandstone (Silurian)

Local Fossil Clubs & Museums