Salts Cave continued REMAINSof cane torch and charred wood on Indian Avenue.CaveResearchFoundation,W. T. Austin. CAVEResearchFoundationvolunteer imitating a prehistoric miner.CaveResearchFoundation,W. T. Austin. CAVEResearchFoundationvolunteer imitatinga prehistoricexplorer and miner in Salts Cave. He is inspecting a handful of white crystals which form on the cave walls and ceiling. It is believed this mirabilite was used medicinallyby the prehistoric people who explored Salts Cave.Cave ResearchFoundation,W. T. Austin. 240