Kind of hard to distinguish, but there is a long black line running across the soil near the top of the mound. This line is called "the black mat."
This black line in the soil hints at evidence that a cataclysmic event wiped out the North American megafauna - such as mammoths, saber tooth cats, giant ground sloths and Dire wolves - along with the Clovis hunter-gatherer culture some 13,000 years ago. https://phys.org/news/2010-04-mammoth-hunters-whimper.html
Nice geology shot.
Interesting UA paper. I keep forgetting, at times, that Canada is part of the glacial story of NA and that the glaciers got further south on the east coast (northern PA and to NYC) than the west (not below 45N, isolated pockets excluded). Also no mention of a caliche layer.
@byrdlip hmmm....maybe because caliche is more of a recent (geologically speaking) desert phenomenon? This area of excavation is more near a riparian area, so perhaps caliche doesn't occur there?
Interesting UA paper. I keep forgetting, at times, that Canada is part of the glacial story of NA and that the glaciers got further south on the east coast (northern PA and to NYC) than the west (not below 45N, isolated pockets excluded). Also no mention of a caliche layer.