How is the process of stratigraphic correlation carried out?

a. by dating through the use of a chronometric method

b. by matching stratigraphy from known sites only

c. by matching strata by chemical composition and color from several sites across distances

d. by correlating stratigraphic markers found at different depths in one location?

The process of matching up strata from a lot sites through the physical, other properties and analysis of chemical. While biostratigraphic dating a relative dating method that uses the associations of fossils in strata to analyze each layer's age approximately. C. by matching color from several sites across distances strata by chemical composition and is the answer.