Driving from San Luis Obispo to Morro Bay you will find a very scenic string of peaks and hills. These have been dubbed the "Nine Sisters", as they were all formed by the same type of volcanic activity 20 million years ago. They are all volcanic plugs. A volcanic plug occurs when magma hardens inside an active volcano vent. The Nine Sisters remain because their plugs formed inside softer rock. Erosion then removed this soft rock, leaving you with the exposed harder plug. Do this nine times and wa-lah! You have the Nine Sisters.
Starting in San Luis Obispo and driving WNW you will find:
Islay Hill - 775 ft - Located in SE SLO
Cerro San Luis (Madonna Mountain) - 1,292 ft - Located in central SLO
Bishop Peak - 1,559 ft - Located in NW SLO
Chumash Peak - 1,257 ft
Cerro Romauldo - 1,306 ft
Hollister Peak 1,404 ft
Cabrillo Peak - 911 ft
Black Hill - 665 ft - Located in east Morro Bay
Morro Rock - 576 ft - At the entrance to Morro Bay
If you click on the pictures you will see their large, original size.
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