1. Geologists usually define a fossil as: naturally preserved remains or traces of animals or plants from the geologic past. Which part of this definition is pretty straightforward, and which part is a little bit vague? 2. What are 3 examples of trace fossils? 3. Of the three major rock types, which is the most likely to contain fossils? Explain. 4.Consider a clam buried in sand. Which part of the clam will you learn about from: a) an external mold? b) an internal mold? c) a cast?