~ Mile 68: Dark cliffs formed on exposed face of a Precambrian-age volcanic sill of
Cardenas Basalt
(consisting of diabase);
Dox Formation
is below the sill, and
Nankoweap Formation
is above the sill (
Hedricks and Stevenson, 1990
).
The URL is: https://gotbooks.miracosta.edu/gonp/grca/river/html/grca2017.htm
Last modified: 9/9/2010
