9. there are 5 stratigraphic principles, list these principles and describe them below: 10. there are 5 mass extinctions that have occurred during earth's history, list the periods during which these extinctions occurred

15 points need quick 1. looking at your graph and the geologic time scale during what period did this rock form? what is the age span of the rock, in millions of years? 2. this rock sample is limestone and shale. with what you know about rock formation, what type of environment did these organisms live in? 3. if some of these fossil samples were found in a rock also containing leaf fossils, could you use radiocarbon dating to determine the age of this rock? explain.