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...
THE BOOK
Some of the ideas discussed in this blog are published in my new book called "The Stonehenge Bluestones" -- available by post and through good bookshops everywhere. Bad bookshops might not have it....
To order, click HERE
Some of the ideas discussed in this blog are published in my new book called "The Stonehenge Bluestones" -- available by post and through good bookshops everywhere. Bad bookshops might not have it....
To order, click HERE
Monday 23 January 2017
Under the Greenland ice sheet
Here are two classic images from a recent video of the landscape around the edge of the Greenland Ice Sheet near Thule, on the west coast. They are superb illustrations of the amount of debris transported on the bed of the ice sheet. In the top photo, the scale is difficult to estimate, but I reckon the basal dirty (ie debris-rich) layer is about 50m thick, packed with entrained boulders and till.
In the bottom photo the very dirty basal layer is thinner, but above it there is a great thickness of layered ice with till concentrated on the contacts between layers. This may be because we are looking at ablation surfaces with debris concentrations -- or that the layers are accretion ice layers originating on the glacier bed during the process of basal melting, thawing and sliding.
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