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, 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.
