Carbon 14 is useful for dating fossils that are
Differences in the ability of species to distribute themselves across space have distinct consequences for the structure of communities.Sites that encompass a greater area tend to have more species (Rosenzweig, 1995).
Why would creatures that would seem to share the same general environment while alive be so widely separated in the fossil record if they did indeed live at the same time and in pretty much the same location?
Then they suddenly disappear from the fossil record some 80 million years ago only to reappear alive an well swimming around in oceans today.
Clearly, some types of coelacanths lived in habitats that did not lend themselves to fossilization while others did.
What is especially interesting is that the fossils do appear to show a progression from the most "simple" of organisms, such as single celled creatures like bacteria, to the most "complex" organisms, such as vertebrates, mammals, and of course humans.
This evolutionary progression seems to be clearly demonstrated in that certain kinds of creatures in the upper layers are rarely if ever seen in lower layers.