Eurypterids are an extinct group of aquatic arthropods often called 'sea scorpions' that lived from the Ordovician to the Permian periods. Collectors look for segmented exoskeletons preserved in fine-grained sedimentary rocks, often found in black shales or marine carbonates where anoxic conditions protected them from scavengers.
Often found alongside eurypterid
Minerals reported to co-occur with eurypterid. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Rarity
- Uncommon
- Uses
- Collector, Scientific Study, Display
- Host rock
- Sedimentary Strata, Typically Shale, Dolostone, Or Limestone
- Typical price
- $50-500 for fragmentary specimens, $1,000-10,000+ for complete specimens
Where rockhounds find eurypterid
Classic worldwide localities
- New York, USA
- Ontario, Canada
- Saaremaa, Estonia
- Podillia, Ukraine
- Scotland
Field-hunting tip
Look in sedimentary strata, typically shale, dolostone, or limestone country — that is the host setting where eurypterid typically forms. If you start seeing calcite, dolomite, pyrite in float, you are in the right ground.
Common questions
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Find eurypterid on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
