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Correlation Using Relative Ages loading

A distinctive rock unit or index fossil can be correlated across a distance and help to piece together a geologic history for the region.

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Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
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    Correlation Using Relative Ages

    Correlation Using Relative Ages

    by CK-12 //basic
    How rock layers in different locations can be connected to make pictures of a region's geology.
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  • Video
    Leaf Fossils in Lapilli Tuff

    Leaf Fossils in Lapilli Tuff

    by CK-12 //basic
    A sample of volcanic ash is used to demonstrate leaf fossils in lapilli tuff. Learn how the distinctive texture of the volcanic rock and the included fossils can be used to help correlate it with other volcanic rocks in the region.
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  • Real World Application
    John Day Fossil Beds

    John Day Fossil Beds

    by CK-12 //basic
    The John Day Fossil Beds in eastern Oregon have a weath of fossils that span a long period of time. The relative ages are well constrained becauase a volcanic ash has been radiometrically dated.
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