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 — that is 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.
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.
