Relative Dating
dating by looking as sedimentary rock; strata
the lower the layer, the _____ the fossil
older
Strata
compressed layers of rock that are older than the newer sediment that covers it
Fossils of transitional forms
fossils that exhibit traits common to an ancestral group and its derived descendant group
Fossils
imprints or remains of organisms that live in the past, and are rarely whole organisms
When fossils are whole organisms what are they usually
insects or mammoths