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Re: Greeting from Japan
Even the most volcanic of lands have been eroded and the
weathered and eroded material deposited as sediments, and often later
metamorphosed. Thus on an island of significant age, there should be all
types of rock, some quite old. Indeed, if you go back far enuf, certainly
all rocks on the earth were derived over billions of years from igneous
rx. Japan, Hawaiian Islands, upstate NY, etc have this derivation altho
volcanics started it all. I mention these because I have seen the
results in all of these places.
Derek, I hope I did not insult you with this. I only meant to
clarify. Otherwise, "mea culpa"!
Ray McAllister, Prof (Emeritus) Ocean Eng., FAU, Boca Raton, FL 33064
Diving Dinosaur, Geologist/Oceanographer/Ocean Engineer, 43 years SCUBA
firstname.lastname@example.org (305) 426-0808, Author Diving Locations, Boynton/Dania