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    Geologic History

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    If gabbro cuts across both sandstone and schist and schist is the oldest, draw a geological cross section showing relations between the rocks.

    Write about the geological history of the region starting with the oldest events.

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    Solution Preview

    I'll leave the drawing up to you as it is pretty simple (two layers with another cutting across) - although be sure to account for the metamorphic rind that will occur from the gabbro's contact

    As schist ...

    Solution Summary

    The answer gives factors to consider when constructing a geologic history based on a simple cross sectional assemblage of rocks