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====Shale====
 
====Shale====
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Shale frequently spalls into the borehole, especially in the minimum principal stress direction. This leads to elliptical boreholes identifiable with multiple arm calipers, as on a dipmeter.
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Shale frequently spalls into the borehole, especially in the minimum principal stress direction. This leads to elliptical boreholes identifiable with multiple arm calipers, as on a [[dipmeter]].
    
====Coal====
 
====Coal====

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