Pterotrigonia wasn't just any clam; it was part of a family of mollusks known for their ribbed shells, something that made them stand out both during their time on the planet and in the fossil ...

20. What is the mode of preservation? What is your evidence? What information can you extract from this fossil? 21. These are both brachiopods (not clams). Without knowing anything about the biology ...

Ice sheets are like bulldozers. As they grow, they push rocks, boulders, clams, fossils and other debris into piles called moraines. By dating ancient clams in moraines, scientists have come up with a ...