Mount st helens carbon dating
The big surprise was that the sediment deposited in fine layers called laminae.
You would expect a catastrophic, high speed ash flow to churn the fine particles and form a uniform, well-mixed deposit.
Since then, laboratory experiments have shown that fine laminae also form quickly from flowing water.
The eruption demonstrated that geologic catastrophe can produce in hours and days geologic features previously believed to have taken millions of years.
Its smoke and rumbling were warning that something big was building up.
Officials set up an exclusion zone around the volcano based on scientists’ ideas about how an eruption would occur.
It is still being eroded, but nowhere near as quickly as it was during the major eruptions of the volcano.
Step Canyon, to the west of Loowit Canyon, is even larger, over 600 ft deep.