How much do we know about Stonehenge? Less than we think. And what has Stonehenge got to do with the Ice Age? More than we might think. This blog is mostly devoted to the problems of where the Stonehenge bluestones came from, and how they got from their source areas to the monument. Now and then I will muse on related Stonehenge topics which have an Ice Age dimension...
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Sunday, 18 March 2018
Clay-with-flints
Worth sharing. Click to enlarge. I found this great photo of clay-with-flints resting on an undulating surface of broken chalk -- this pic is from the Chilterns.
The irregular bedrock surface is the [product of many different processes. I suspect that here solutional rills are a part of the scenario, but maybe we are also looking at enlarged cracks associated with permafrost in the past, and there is also a possibility of cracks and pits associated with deep root penetration at a time of woodland cover.
The clay-with-flints is a highly variable and somewhat mysterious material -- containing flint nodules weathered out of the chalk but also erratic pebbles assumed to have come from stripped away Cretaceous layers which once rested on the chalk. I have always felt that glacially derived material may also be contained -- .but much more systematic studies will be needed before the full story is known
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