Question

The diagrams below represent rock layers found in two different locations by two different scientists. The scientist at location X used letters to label his rock layers, while the scientist at location Y used roman numerals to label her layers. Examine these diagrams and then answer the question that follows.



The scientists both used the same colors and patterns to represent different types of rocks. They also used the same set of black-and-white symbols to represent specific types of fossils in the layers. By correlating layers based on fossils and rock types, the two scientists have discovered that certain rock layers are present in both locations.

Based on this information, if the age of layer R is 260 million years, then what other layer likely also has an age of 260 million years?
A.
II
B.
Q
C.
VI
D.
S

Answer 1

A. II

Layer R and layer II contain the same rock type and the same fossil symbol, so they correlate across the two locations. Because correlated layers are the same age, layer II would also be about 260 million years old.