Morro Rock, a State Historic Landmark, was formed about 23 million years ago from the plugs of long-extinct volcanoes. Morro Rock was an important navigational aid for mariners for over 300 because the rock is approximately 576 feet tall which made it the most visible in a chain of 9 peaks.
What is Morro Bay named for?
Morro Bay
------------
County
Founded
Incorporated
Named for
Did Morro Rock used to be a volcano?
Morro Rock is the westernmost peak in a chain of hills known locally as the “Morros” or the “Nine Sisters.” These scenic peaks follow a line that extends between Morro Bay and San Luis Obispo. They are the eroded remnants of a chain of ancient volcanoes that erupted between 20 and 26 million years ago.