Assertion: flower's appearance | /r/CapableOf | pose such a problem
Facets:
value: for the theory of evolution
type: PURPOSE
Source sentences:
text: The apparently sudden appearance of relatively modern flowers in the fossil record posed such a problem for the theory of evolution that it was called an "abominable mystery" by Charles Darwin.
text: The apparently sudden appearance of nearly modern flowers in the fossil record initially posed such a problem for the theory of evolution that Charles Darwin called it an "abominable mystery".