Yes.
The black mat is the Younger Dryas Boundary (YDB).
Quote: We present detailed geochemical and morphological analysesof nearly 700 spherules from 18 sites in support of a majorcosmic impact at the onset of the Younger Dryas episode (12.8ka). The impact distributed
10 million tonnes of meltedspherules over 50 million square kilometers on four con-tinents. Origins of the spherules by volcanism, anthropogenesis,authigenesis, lightning, and meteoritic ablation are rejected ongeochemical and morphological grounds. The spherules closelyresemble known impact materials derived from sur
ficial sedi-ments melted at temperatures 2,200 °C. The spherules corre-late with abundances of associated melt-glass, nanodiamonds,carbon spherules, aciniform carbon, charcoal, and iridium.
The black mat is the Younger Dryas Boundary (YDB).
