Sometime around 1979-80, my husband and I were backpacking in Maine along the AT and spent a night in a shelter. Don't remember where it was, but I remember the shelter floor. It was made of whole tree limbs about 2-4 inches in diameter. Imagine trying to sleep on that! I had a therma-rest and managed to sleep by blowing it up hard. Others were not so lucky. I understand the shelters all have flat floors these days. Anyone else experienced log floor shelters? When did the last one disappear?