Scientists from MIT and elsewhere have identified chemical fossils that may have been left by ancient sponges in rocks more than 541 million years old. These chemical fossils are special types of steranes, which are the geologically stable…
Scientists from MIT and elsewhere have identified chemical fossils that may have been left by ancient sponges in rocks more than 541 million years old. These chemical fossils are special types of steranes, which are the geologically stable…