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| This gives a better idea of the layers of the travertine. Remember, these mounds are HUGE. Probably 60 feet high and flat. They grow by inches - so fast they can cover over the boardwalks. | |
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| This gives a better idea of the layers of the travertine. Remember, these mounds are HUGE. Probably 60 feet high and flat. They grow by inches - so fast they can cover over the boardwalks. | |