Which one of the following Phanerozoic periods has the shortest duration of time?
Show Hint
- Cambrian
- Devonian
- Cretaceous
- Silurian
The Correct Option is D
Solution and Explanation
Step 1: Recall the Phanerozoic Eon divisions. The Phanerozoic Eon (541 Ma to present) is divided into Paleozoic, Mesozoic, and Cenozoic eras, each containing multiple periods.
Step 2: Approximate durations. - Cambrian: ~541–485 Ma → about 56 million years. - Devonian: ~419–359 Ma → about 60 million years. - Cretaceous: ~145–66 Ma → about 79 million years. - Silurian: ~443–419 Ma → about 24 million years.
Step 3: Compare durations. The Silurian Period is clearly the shortest, lasting only about 24 million years.
Final Answer: \[ \boxed{\text{Silurian}} \]
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