The ages of the sedimentary strata are bracketed by the ages ofthe igneous intrusions
shown in the diagram below. Deduce the approximate or relative age,of the sedimentary
strata from the absolute ages of the igneous rocks illustratedbelow.
Approximately how old is strata
4? ___________ 3? ___________ 2? ___________ 1? ___________
In what geologic epoch would you place strata 3 and 4?