Which sample would not be appropriate for dating by means of radioactive potassium?
A) A Homo erectus skeleton thought be around 800,000 years old
B) An igneous intrusion into the sediments of the Cretaceous sea where they are now exposed on land
C) An igneous intrusion from a 250-million-year-old volcano eruption associated with the Permian mass extinction
D) An igneous intrusion into the sediments of the Cambrian sea where they are now exposed on land
E) Stromatolites containing 3-billion-year-old bacterial mats
Correct Answer:
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A)
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