C558-20 Devil's Hole, DVNM, Ash Meadows, Nye Co., Nevada. 6 October 1968 0640 - 0920 hrs. C James, C W Levy, Stein Little General Observations: upper shelf Spirogyna location on upper shelf Weather - Clear, no wind Upper Shelf - Spirogyna sparse. Much deep gray (decaying spirogyna) and light tan silt covering. Note - spirogyna sparse & silt condition suggest another sand storm or flood since I was last here in August. Later, I noted more rocks & damage done to the floating cage. Cage - spirogyna very thick - lining side & bottom in most places. Algae mats are no longer green - almost black. Algae mats on shelf are also not green - almost black. Spirogyna is absent from extreme so tip of the shelf area - This area had been untouched by the flood & debris & had had been filled with spirogyna.