The rule of Vs in some wooden blocks...

Each block model has a dark-colored layer, shown dipping gently to the left in the top block, steeply to the left in the middle block, and vertical in the bottom block. Note that the map pattern of the layer shows it making a "V" in the direction of dip where the block is cut by the notch. Note also that the steeper the dip of the layer, the less pronounced the "V" becomes; where the layer is vertical, there is no "V" at all.

Note also, that it does not matter which direction the gradient of the notch runs--the "V" points in the direction of the dip of the bed.

These blocks were made by John Lewis, who taught my structural geology class way back in...

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