OREGON STATE UNIVERSITY

Stop 16: Castle Rock and the Tocance Formation

 

CASTLE ROCK AND THE TOCONCE FORMATION

22°14'37.14"S, 68°9'25.20"W

Castle Rock

Castle Rock is a formation comprised of layers of ignimbrite that have been eroded into the shape of a castle. Most ignimbrites are units of the Toconce Formation and the identifiable pink layer at the bottom is Sifon Ignimbrite, 8.1 Ma.