Clastic Dikes Form Polygonal Networks

Networks of Pleistocene clastic dikes are sometimes visible on bladed slopes or surfaces that have had all vegetation removed.

Aerial photo shows a dike network translating through a bladed slope along I-82 near the Best Western at Sunnyside, WA. Google Earth photo, May 2015.

Photointerpretation of the dike network. Denser vegetation grows atop the dikes, making them darker.

Taller grasses highlight the dike network in Touchet Beds. Google Street View photo.