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Posted by MO Pat E (76.233.77.229) on 14:19:21 07/10/13
In Reply to: Some run-off from Black Opal Spring. posted by MO Pat E
Quoting from trail guide, "Biscuit Basin was named for the unusual biscuit-like deposits that used to surround Sapphire Pool. Following the 1959 Hebgen Lake Earthquake, Sapphire erupted, and the "biscuits" were blown away; it last erupted in 1991. Sapphire remains one of the most beautiful blue pools in the park."
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