World ‘This is a big moment for crabs’: 100-million-year old fossil in amber alters crustacean past October 21, 2021October 21, 2021Scott Gleeson, USA TODAYComments Off on ‘This is a big moment for crabs’: 100-million-year old fossil in amber alters crustacean past Fossils of the earliest "modern-looking" crabs were discovered in tree amber, estimated to date back 100 million years, rewriting crustacean history.