File:Fine place to break a leg! Low tide at ~minus 0.5 ft. North coast of SLO county. North of "Little Hawaii" beach. (50775346248).jpg
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| Description |
Amazingly rugged etched cobble-conglomerate, a member of the subaerial Lospe formation, early Miocene(?), a fault-bounded sliver transported North by one of the many members of the San Andreas family of strike-slip fault. This section of the FZ is (thought to be) dormant, but members of the San Simeon family of faults knocked the top off the Piedras Blancas light in 1945, and minor temblors are common. One or two have rattled dishes since we moved in. Why I carry earthquake insurance on our house in Cambria! Age of the Lospe is around 17.5 mybp, from K-A age-dating of a water-lain rhyolite tuff in the Santa Maria basin, 60 miles or so south of here, the type area (USGS Bull 1995-m, 1995). Clasts are a real dog's-breakfast of whatever was washing downhill in the early Miocene, in the source area. Dr. David Chipping, our local expert, thinks this sliver came from further south from there(?), if memory serves. The USGS quad map I-795 (all USGS pubs are online & free) gives an Oligocene date for the Lospe in this quad, which, if true, would make these rocks a bit older. No tuffs in the section I saw = nothing to age-date radiometrically. The "mystery rock" from just south of Arroyo de los Chinos, that I posted here a couple weeks ago, is likely a clast from the Lospe per Dr. Chipping. Despite pretty careful prospecting in these beautiful exposures, I found none of that here. But lots more odd rocks, which I am still contemplating. The oddest was too big to drag back to the car this time. I might have to dust off my old field pack and grab it next time! On a day when State Parks isn't on patrol.... |
| Date | |
| Source | Fine place to break a leg! Low tide at ~minus 0.5 ft. North coast of SLO county. North of "Little Hawaii" beach. |
| 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@N06/50775346248. 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 | | 3,646 × 2,734 (5.62 MB) | Orizan (talk | contribs) | Transferred from Flickr via #flickr2commons |
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