Double Eurypterus remipes (Sea Scorpion) ec824443c95d0e87cc3e574f9cdc918c Very frequently

Very frequently

(about 150 to 180 million years ago)

Current scientific opinion is that all of the material came from the same impact

60's & 70's Dave Douglass began his passion for fossil collecting in an area known as the Braidwood / Mazon Creek fossil beds in Illinois

Double Eurypterus remipes (Sea Scorpion) ec824443c95d0e87cc3e574f9cdc918c Very frequentlyEurypterids, commonly known as Sea Scorpions, are an extinct group of arthropods that are related to arachnids and include the largest known arthropods to have ever lived. Prevalent during the Silurain and Devonian ages, eurypterids were segmented aquatic arthropods, with compound eyes, and two club like claws. Some species exhibit toothed claws, and may therefore have been predators. Though they are globally dispersed, eurypterid fossils are uncommon