Use the data you've recorded from the previous activity to arrange the rock layers from oldest to youngest on the

geologic time scale. determine the identity of the unknown fossil by using the fossils chart.

?

tools

paleozoic er

paleozoic era

to

million

years ago

basalt

limestone with

unknown fossil

tom

cambrian

ordovician

silurian

ro

niferous

sandstone with

trilobite

amm

shale with

ammonite

check