The 122.66W Meridian cuts through the cliffs on the north side of Penn Cove, near the Monroe Landing Road:
Electro-kinetic POTENTIALS, Ek, occur when there is fluid flow through capillaries, or alongside clay SURFACES, which creates CHARGE. This is sensitive to the ionic content of the fluid, and fresher water (low salinity) is a FACTOR! Powder river basin is in a dryer area, and the Ek Potentials are MAXIMUM, compared to those in the Gulf Cast, where the humidity is high. I have analyzed LOGS in both areas (thousands), and find that Ek is rare in the Gulf Coast!
Selecting the Sahara Desert, Africa, should allow an excellent comparison for ARIDITY:
Starting with the Kamil crater, which is a well-preserved FEATURE- that may be seen to represent the standard CIRCULAR portion, with sufficient time to develop an Eastern PRECESSIONAL later entity, and a "TIT" to the south of the 2 older units: