Relati ve dating of geological strata
Some of these sedimentary rocks were deposited in shallow seas that once extended over large areas of the present continents.
In many places sedimentary rocks lie much above sea level, reflecting vertical shift of the crust relative to sea level.
Ordinarily, beds of sedimentary rocks are deposited more or less horizontally.
In some regions sedimentary strata have remained more or less horizontal long after they were deposited.
Therefore, using fossil progression as evidence for evolution is circular reasoning.
ANSWER: Relative dating is used to determine the relative ages of geologic strata, artifacts, historical events, etc.
Ice cores showed the age of a military plane buried in the artic as thousands of years old.
The ages of different sequences of strata, for example, can be compared with each other in this manner, and their relative ages with respect to faults, igneous intrusions, and other features that exhibit crosscutting relationships can be established.
Given such a network of relative ages, a chronology of events has been gradually established in which the relative time of origin of various geologic features is known.
Fossils are used to determine the order and dates of the strata in which they are found.
But the fossil order itself is based on the order of strata and the assumption of evolution.