Sunda Plate (Wikipedia) The Sunda Plate is a minor tectonic plate straddling the Equator in the Eastern Hemisphere on which the majority of Southeast Asia is located.
Possible Wave Cut Slope on Marrowstone (washingtonlandscape.blogspot.com) Much of the shoreline bluffs on Marrowstone Island are very abrupt, with a steep vertical drop due to the hard glacial till that can stand for decades as vertical cliffs.