This earth cache is in the Yaquina Lighthouse State Park. If you are driving into the park be prepared to pay $7 per car for parking, on foot is free. Going up and down some stairs will be required to log this cache.
Cobbles are a result of boiling lava meeting the cold ocean floor, followed by million years of weather and erosion.
Hot basakt explodes upon contact with cold sea water and intermixed with quickly chilled volcanic glass to form a "breccia". The cobbles on this beach are weathered remains of these exploded fragments.
For this many cobbles to form there is lava leaking out under the ocean floor near this location. Oregon is known for having under water volcano's and also is along a volcanic fault line. These cobbles then wash up on shore and with the salt water attacking these fragments they then become rounded.
To log this cache please do the following
Optional: In the log
1) Take a picture of yourself on the beach holding some "Cobbles" and your GPS.
Email me after you log the cache (The posted coordinates take you to the info board about cobbles)
1) How many million of years of weather and erosion does it say above the cobbles?
2) The tide would be easy to predict if it happened every how many hours?