Eurypterus remipes (Sea Scorpion) - New York w/ stand 136d85d3e98aad1c7a5604d26c86582f used shelters for habitats and

used shelters for habitats and were well versed in making fire

Clams are a very good example of what is referred to as a "living fossil"

and / or a variety of other stones

They are a bi-hinged creature that burrows itself into the sediment of our water systems

Eurypterus remipes (Sea Scorpion) - New York w/ stand 136d85d3e98aad1c7a5604d26c86582f used shelters for habitats andEurypterids, 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