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Ejecta? Volcanic bomb? Something else?
I was up at Pyramid Lake near Frazer Park in California some time back and plucked a roundish rock from the water. It was floating near the shore - kind of bobbing there in the wavelets. It is about the size and shape of an avocado and appears to be a large number of small globules of pumice soft-melted into this rough lightish brown tear-drop shape.
My first thought was "wow, meteorite!" but instantly realized this wasn't possible. It *looks* like a piece of volcanic pumice ejecta, or bomb. Anyone knowing that area will tell you there has been no volcanic activity in that area for about as long as that area has existed. Anyone have any clue what this might be?
Sorry! No pictures. I no longer have the piece :(
3 Answers
- Anonymous1 decade agoFavorite Answer
No, there is no volcanism in the area, or even remotely near the area. The closest volcanoes are up near Lassen Peak north of Sacramento (bottom end of the Cascades). The Sierra Nevada, San Gabriel, and other mountains are just fold-fault ranges from compression, not volcanism.
California is a transform boundary, where the Pacific plate is moving north along the San Andreas Fault Zone, and the North American plate is moving south, relative motion. There are no volcanics along this type of boundary. The Cascades were formed, and continue to be formed by the subduction of the Juan de Fuca plate beneath the North American plate -- the deep melt creates the light magma, and eventually (if things go right) you get a volcanic mountain range.
I can't say what it is that you found... because even if there were volcanics in the area, pumice doesn't float forever. It slowly fills with water, breaks down, and over the course of weeks or at best, months, will sink. Since there hasn't been any eruption in California or nearby recently... I dunno. Must be something man made that simulates a rock.
Source(s): Experienced geologist. - parkhillLv 45 years ago
You are proper in aspect. However, volcanic eruptions generally tend to chill, no longer hot, the earth. The identical is right of Atomic explosions. In each instances a pleasant deal of first-class dirt and ash are thrown into the surroundings and block the suns rays for months. Note I mentioned MONTHS, no longer years, so much much less many years. The ash from A-bomb exams lengthy in the past dissipated. And as I mentioned, could generally tend to chill the Earth just a little for a couple of months--not more. Mostly no longer even that--so much exams had been underground. Those tha were not did not have so much have an effect on on the time--and of direction none now.
- 1 decade ago
I HAVE HEARD OF FLOATING ROCKS IN INDIAN OCEAN AND ALSO SEEN PICS OF THEM. IT IS SAID THESE ROCKS WERE USED BY SRI HANUMAN AND HIS MONKEY ARMY FOR BUILDING A BRIDGE FOR SRI RAMA TO CROSS THE SEE THAT DIVIDED INDIA FROM CEYLON, I.,E. SRI LANKA.
UNFORTUNATELY I TOO DO NOT HAVE THE PICS BUT THEY DID APPEAR OVER INTERNET.
