11-1/2" Utah Septarian Bookends Agate Bookends The oldest blastoids lived about

The oldest blastoids lived about 425 million years ago

low and heavy heads

This is a large cuff that would fit an 8 or 9 inch wrist

meaning "different lizard" was a large theropod dinosaur which lived in abundance

when it needed to either defend itself from large carnivorous predators

11-1/2" Utah Septarian Bookends Agate Bookends The oldest blastoids lived aboutThese strange and handsome Geodes are from the Henry Mountains of Utah. Originally formed in an ancient sea floor some 50 70 million years ago, sediment collected around sea life as they decomposed, forming a concretion. Calcium carbonate from the shells of these creatures began to take a new form over time, creating calcite crystals and bands of aragonite. As the oceans receded, these mud balls hardened, shrinking and cracking in the sun. The gold