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This query for Cenozoic Era rocks uses conventional
data integration without the ontology system and fails
to find the appropriate rocks (colors arbitrary).
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Looking for rocks of Cenozoic age using semantic mediation
with an ontology system produces a smarter
query that finds abundant rocks by including rocks of
both Quaternary age, the second period of the Cenozoic
(yellows), and Tertiary age, the first period of the
Cenozoic (darker colors). Gray indicates absence of
Cenozoic rocks.
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