Daniel recently read a news article about geologists updating the geologic time scale. This happens when new physical evidence is discovered. Which of the following would provide physical evidence that could change the divisions on the geologic timeline?

A. the discovery of ancient ruins buried deep in the ocean floor sediments
B. the discovery of fossilized microorganisms in ocean floor sediments
C. the discovery of evidence of humans who lived long ago
D. the discovery of evidence of different kinds of rocks that recently appeared