Question

A group of paleobiologists were studying sedimentary rocks in the Rocky Mountains of North America. What order of organisms would they find in the layers of these sedimentary rocks?
All organisms are arranged randomly in the layers of sedimentary rocks.
Newest organisms are at the bottom and the oldest organism is in the top-most layer of the sedimentary rocks.
Oldest organisms are at the bottom and the newest organism is in the top-most layer of the sedimentary rocks.