The best index fossils are common, easy-to-identify at species level, and have a broad distribution--otherwise the likelihood of finding and recognizing one in the two sediments is low.
Otherwise the likelihood of finding and recognizing one in the two sediments is low. The best index fossils are common, easy to identify at species level, and have a broad distribution.
The best index fossils are common, easy to identify at species level, and have a broad distribution. Otherwise the likelihood of finding and recognizing one in the two sediments is low.
The best index fossils are common, easy to identify at species level, and have a broad distribution. Otherwise the likelihood of finding and recognizing one in the two sediments is low.