File:Franciscan melange + radiolarite, Estero Bluffs SP, just N of Cayucos, CA (50757250907).jpg
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An interesting set of bluffs here, where Prof. Chipping, emeritus Cal Poly, would often take students and visiting colleagues to geologize. Even for lesser mortals, it's really interesting. Without cracking his report (his field trip walking guide, which is on order), here's what's going on: This mess of rocks represent the scrapings (just like scraping off leftovers from a messy pan) as the Pacific Plate was forced under the North American plate in late Cretaceous time. Visible here, and all dipping steeply west (we're looking south, towards Morro Rock, at top right) are, left to right (east to west): green gunge-- some sort of bedded metavolcanic greenstone. Deep red thin-bedded radiolarian chert, a deepwater-marine rock. More thin-bedded greenstone. In the distance, rising from the beach is a big "knocker" of reddish radiolarite, precariously leaning to the west. If you look closely, it's concordant (same dip) with the rocks above. This sort of rock is known to seismologists as a "Precariously Balanced Rock" (PBR), and is decent evidence that no large seismic event has happened here in the last 15,000 years or so. The evidence is from the vicinity of the Diablo Canyon nuclear power plant, near Avila, Calif a few miles south of here. The local geology, seismicity and structure (faulting) were studied in detail before the plant was built, and studies have continued since. A married pair of seismologists recently studied the PBRs around the plant, and concluded that no strong seismic shaking had occurred there in the last 15,000 years or so -- or else the PBRs would have been knocked down. Good news for the safety of the plant! Too bad PG&E and the State of Calif plan to close Diablo Canyon in the next few years. It produces about 10% of Calif's electric, and is 100% carbon-free power. Plus it's operating, reliable, in good condition, and paid for. Too bad the so-called Greens HATE nuclear, and can't wait to close it. The state plans to replace this reliable generator with expensive and unreliable solar and wind power, all of which needs to be backed up 100% with fossil-fueled generators. Think about it. Why Calif is driving people and industry away! Crazy. |
| Date | |
| Source | Franciscan melange + radiolarite, Estero Bluffs SP, just N of Cayucos, CA |
| Author | Peter D. Tillman from USA |
| Camera location |  | View this and other nearby images on: OpenStreetMap |  |
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This image was originally posted to Flickr by Pete Tillman at https://flickr.com/photos/29050464@N06/50757250907. It was reviewed on 26 July 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-sa-2.0. |
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| current | 00:47, 26 July 2021 | | 3,751 × 2,812 (3.69 MB) | Orizan (talk | contribs) | Transferred from Flickr via #flickr2commons |
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