Derryvree Ice-Free Interval
The nearest particularly informative sequence lies at Derryvree, near Maguiresbridge in County Fermanagh. Road works exposed freshwater silts and fine sands later buried beneath glacial deposits. Organic material from the deposit produced a radiocarbon age of about 30,500 radiocarbon years before present; when calibrated, the published range is approximately 36,900–31,700 calendar years before present. The nominal year 31,976 BCE lies within that broad interval. It is not possible to say that the deposit formed in that exact year, but it is responsible to regard it as evidence for conditions in northern inland Ireland at roughly this time.
