Fern fossils appear as detailed carbonaceous imprints of prehistoric fronds preserved within fine-grained sedimentary rock. Collectors should look for distinct, sharp venation patterns on the split surfaces of ironstone nodules or dark shales. These are most commonly found in Carboniferous-aged coal measure environments.
Is this fern fossil?
3-step field checkRun through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.
- 1Read the lusterHold the specimen under a strong light. Fern Fossil typically shows a dull luster.
- 2Match the color rangeCompare against the expected color range: black, brown, gray, tan.
- 3Look at form & habitTypical habit: imprint.
Often found alongside fern fossil
Minerals reported to co-occur with fern fossil. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Luster
- Dull
- Transparency
- Opaque
- Crystal habit
- Imprint
- Rarity
- Common
- Uses
- Collector, Educational
- Host rock
- Sedimentary Shale or Siltstone
- Typical price
- $5-100 per specimen
Where rockhounds find fern fossil
Classic worldwide localities
- Mazon Creek, USA
- Joggins, Canada
- Saint-Etienne, France
- Shanxi, China
Field-hunting tip
Look in sedimentary shale or siltstone country, the host setting where fern fossil typically forms. If you start seeing siderite, coal, shale in float, you are in the right ground. Field specimens usually show a imprint habit, so train your eye for that shape before scanning the outcrop.
More fern fossil photos
Common questions
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Find fern fossil on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
