Subject	index fossil
Predicate	be used to
Object	date
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.7883
Neighborhood Sigma	0.8735
Local Sigma	0.9050
Example Sentences	Sentence Occurrences Source index fossils are used to date surrounding rock 2 Google Autocomplete index fossils are used to date rock layers quizlet 1 Google Autocomplete index fossils are used to date the age of rock 1 Answers.com Questions