UPPERSALTSCAVE.These huge blocksof limestonehave fallen from the upper part of the passage,nearly blocking it. Passagewalls and ceilingare blackenedby smokefrom aboriginal torches.Cave ResearchFoundation,F. Benington. BUNDLEof twigsand branchesbound with bark ties, as found behind a large boulder in Upper Salts.Illinois StateMuseum,R. L. Hall. 241