Stonehenge, Charles Darwin and Worms – What’s the connection ?
1 07 2012Darwin’s earthworms and Stonehenge
One of Charles Darwin’s lesser known scientific contributions was the study of the humble earthworm. But could his work on this underground creature provide valuable clues about the ancient site of Stonehenge?
The earthworm plays a crucial role in improving soil fertility as it burrows beneath the ground.
Its work helps us to live in a green and pleasant land as the worms aerate the soil.
But as Darwin discovered, worms are also surprisingly good friends to archaeologists.
Stonehenge solutions
Darwin’s studies of earthworms at Stonehenge involved some of the first scientifically recorded excavations at the site.
They’re unusual because they were carried out not by an archaeologist, but by a naturalist.
Darwin was interested in the action of earthworms in burying objects.
Earthy solutions – the humble earthworm.
It’s the continual processes of burrowing, digesting and excreting the soil by earthworms that gradually leads to
objects settling down in the soil.
In some cases they become completely buried by it.
Dr Josh Pollard, one of the directors of the Stonehenge Riverside Project, has been assessing the importance of Darwin’s worm experiments at the ancient site.
Pollard thinks he’s identified a fallen stone on the outside of the circle, and one that was split in two, as the subject of Darwin’s book – “Vegetable Mould and Earthworms”.
The book features a picture of the ground which had built up around the fallen stone and describes how the stone had sunk into the soil profile:
“At Stonehenge, some of the outer Druidical stones are now prostrate, and these have become buried to a moderate depth in the ground.”
Animal diggers
Darwin discovered that earthworms are rather like archaeological JCB diggers.
They eat the earth, it goes through their muscular tube, and comes out the other end as worm casts.
This is where the earthworms interact with archaeology.
The cumulative effect of millions of worms in a field chewing their way through the soil and depositing it on the surface is that they actually raise the surface of the soil.
Darwin worked out that the soil increased in depth by 0.2 of an inch per year.
After 10 years an object in the soil will go down two inches, and after 1, 000 years it will reduce down 200 inches.
The result on the ground is that things disappear and gently sink into the soil.
To test this theory Dr Josh Pollard visited the site of one of his old excavations – the remains of a Saxon village on a farm overlooking Cheddar in Somerset.
Since his last visit a decade ago the landscape has changed – and it’s down to the efforts of the earthworms which have worked their their magic.
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