Evidence best indicates that rock layers 4 and 8 were deposited during the same geologic
period because both layers
A)
contain the same index fossil
are composed of glacial sediments
contain index fossils of the same age
D)
are found in the same area

Your answer is d. silli hope this ! : ) i left an explanation down below if you need it: a sill forms when hot magma squeezes between layers of rock to form a hardened sheet of rock. a sill is basically a tabular sheet intrusion between old layers of sedimentary rock, volcanic beds, or in the direction of foliation inherent in metamorphic rock. the word sill means a concordant intrusive sheet.

Ais the answerhope it