http://digfir-published.macmillanusa.com/earth_imagemaps/earth_imagemaps_geologicrecord.html
Chapter
1. Geologic Record
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http://digfir-published.macmillanusa.com/earth_imagemaps/earth_imagemaps_geologicrecord_dlap.xmlDLAP questions57276885757a2ee66b00000d