Llangorse Lake and key Late Palaeolithic sites and other palaeoenvironmental records referred to in the text within the British land mass (green) and the ice sheet extent (white) at 16 ka (ref. 2).
I've posted a few examples recently showing how scientists, unlike creationists, can and do change their minds when the evidence changes. Far from being a weakness, this is one of science’s great strengths. It is creationism, with its fixed conclusions and evidence-proof dogma, that has the fundamental problem.
This post, and my next one, will look at two more such examples. Neither will bring any comfort to creationists hoping to show that science is unreliable, or that scientists simply invent data to protect some preconceived orthodoxy.
The first concerns a revised estimate of when humans returned to what are now the British Isles after the Last Glacial Maximum. The next will look at how new evidence has required a revision of the accepted view of the origins of the population of the Japanese Archipelago. Both, of course, sit very awkwardly with the Bible-based narrative that requires belief in a magical creation without ancestry, followed by a population reset in which all modern humans supposedly descend from eight survivors of a genocidal flood, radiating out from the Middle East only a few thousand years ago.
Firstly, then, the repopulation of the British Isles. It had long been assumed that people moved back into Britain from north-western Europe around 14,700 years ago, as the climate warmed at the end of the last ice age. That estimate has now been pushed back by about 500 years, to around 15,200 years ago. In turn, this has forced scientists to reassess the timing and pattern of the climatic changes that made such a return possible.
The revision arose from improved geochronology and the recalibration of radiocarbon dates. Once the earliest known post-glacial human evidence in Britain was placed at about 15,200–15,000 years ago, there was an obvious problem: the existing climate models suggested that Britain should still have been too cold, not only for people, but also for the grazing animals they depended on, such as reindeer and horses.
Rather than ignore the discrepancy, or force the evidence to fit the old model, scientists did what scientists are supposed to do: they re-examined the data. A reassessment of lake-bed cores, especially from Llangorse Lake in South Wales, showed that parts of southern Britain had indeed experienced an earlier period of summer warming. This would have created the conditions for grassland expansion, the northward movement of prey species, and the return of human hunter-gatherers.
The study was conducted by a team led by Ian P. Matthews and Adrian P. Palmer of the Department of Geography, Royal Holloway, University of London, who published their findings in Nature Ecology & Evolution.
Adrian Palmer has also written an article in The Conversation, in which he explains their findings and why the discovery of earlier human remains made it necessary to reassess the timetable of climate change. His article is reproduced here, under a Creative Commons licence, reformatted for stylistic consistency:

































