Chapter 5. Rocks, Fossils, and Time— Making Sense of the Geologic Record. Geologic Record. The fact that Earth has changed through time is apparent from evidence in the geologic record The geologic record is the record of events preserved in rocks Although all rocks are useful
Rocks, Fossils, and Time—Making Sense of the Geologic Record
Step a: burial of a shell
Step b: dissolution leaving a cavity, a mold
Step c: the mold is filled by sediment forming a cast
Absolute ages (the numbers) were added much later.