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The Hogback Dike 
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The Hogback is a resistant dike at least six miles long that runs along the northwest side of Lathrop State Park.  While visiting the park one can hike along the dike.  Also, a road cut on the north edge of Walsenburg gives a nice cross section through the dike and the baked zones on each side.

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The road cut through the Hogback dike shows the dike between the thin yellow lines. On either side of the dike are zones where the Pierre shale has been baked and hardened against erosion.  The red lines highlight the sedimentary layering in the hardened shale.  Outside the area affected by the heat (thick yellow lines) from the dike, the shale is very susceptible to erosion and the layering is not even discernible.

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Close-up of road cut exposure of Hogback dike showing contact of dike on left with Pierre shale on left.
Last Updated: 11/5/2012 4:08 PM 
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