Muskeg Beneath Fermanagh
The most useful evidence near this date comes from Derryvree, close to Maguiresbridge in County Fermanagh. There, freshwater organic silts survived between two layers of glacial till. This is an exceptional piece of geological good fortune: later ice both erased much evidence elsewhere and sealed this small archive below its debris. A radiocarbon determination of 30,500 ± 1,200 radiocarbon years BP from the Derryvree series calibrates broadly to about 36,900–31,700 cal BP. That range encompasses the chronological neighbourhood of 31,906 BCE, though it cannot prove that every fossil in the deposit lived in that nominal year.