The most conclusive evidence for microfossils comes from rock samples with
A) an age of 3.5 billion years old
B) ages between 2.7 and 3.0 billion years old
C) ages between 3.2 and 3.5 billion years old
D) an age of 3.85 billion years old

Question

Quizplus · Accepted Answer

The ages between 2.7 and 3.0 billion years old have produced the most conclusive evidence for microfossils. This includes samples from the Apex chert in Western Australia and the Gunflint Formation in Canada. Samples from 3.5 billion years old and 3.2-3.5 billion years old have also produced evidence for microfossils, but not as consistently or conclusively as the samples from the 2.7-3.0 billion year range. The sample with an age of 3.85 billion years old is too old for the existence of complex life forms and thus is not likely to contain microfossils.

The Most Conclusive Evidence for Microfossils Comes from Rock Samples