The dating technique used is called relative dating.
Relative dating is used to order geological events and the rocks they leave behind. Stratigraphy is the process of interpreting the order (layers of rock are called strata). Relative dating does not yield precise numerical dates for the rocks.
RELATIVE DATING The position of a specific fossil in a stratified sequence of sedimentary strata determines its relative age – older or younger. Lower-layer fossils are older than those in the top strata, which were created by more recent deposits.
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