|
WORLD'S (?) GREATEST PILLOW LAVA |
 |
This bluff is located just west of the Port San Luis Pier. First glance doesn’t suggest anything unusual, but take a closer look below. |
| The bluff is loaded with incredible pillow lava. What’s pillow lava? Take Geology 10 or 20 for details, but the simple answer is that they’re volcanic lava flows that erupted under water. These are part of the Franciscan assemblage and date from the Jurassic or Cretaceous period about 200 million years ago! We find them all over the central coast. |  |
 |
Here's one from Cayucos, California. Again from a distance it doesn’t look like much, but the close-up below reveals the pillow structure. |
| Well developed pillow structure in rock mass along beach in Cayucos. |  |