ANTECEDENCE and SUPERIMPOSITION

"No topographic control of transverse drainage incision into bedrock high"

  The first image illustrates an antecedent physical model where the drainge incised into a structure sloped perpendicualr to flow, yet had no effect on the transverse drainage's emplacmeent into the bedrock high.  The San Juan River incised the Goosenecks across the southern flank of Monument upwarp likely through superimposition and illustrated in the second image.  The structure's dip to the south did not affect emplacement of the transverse drainage.  Because antecedent and superimposed drainages pre-date uplift or the most recent exposure of the bedrock high, the topographic expression of the structure can not influence the drainage's position across that strucutre.  An exception to this would be the development of a superimposed transverse drainage across a partially buried bedrock high, and therefore, the drainage can possibly develop across a low saddle.