The Geological Time Scale Indicates the Order of Eras to Be

The geological time scale indicates the order of Eras to be Cenozoic as the most recent,the middle Era is the Mesozoic,with dinosaurs as the major group,and the earliest Era being the Paleozoic.Consider a hillside of rock that surfaces in your backyard that is identified as dating back to the Mesozoic Era.What is possible?

A) Fossils from all other strata can still be found underneath if you dig far enough.
B) All periods of fossils had to be laid down in the backyard but higher ones were eroded away.
C) Fossils were mainly deposited when your backyard was sediment, so many layers might be missing, but any layer from Cenozoic to Paleozoic might be found.
D) Fossils were mainly deposited when your backyard was sediment, so many layers might be missing, but any layer from earlier Mesozoic through Paleozoic might be found.
E) Only one layer of fossils can be found at any site.