Something has been bothering me about the photo in post 402, of the boot and overlying black material.
The left edge of the black material has a layered look. Could this be congealed oil, or tar? Could it be a finely layered deposit of coal, or coal mixed with oil or tar?
The left edge of the black material has a layered look. Could this be congealed oil, or tar? Could it be a finely layered deposit of coal, or coal mixed with oil or tar?

"What our ancestors would really be thinking, if they were alive today, is: "Why is it so dark in here?"" From Pyramids by Sir Terry Pratchett, a British National Treasure.
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