I came across an intriguing claim about glacial erratics on the shores of the Bristol Channel that underpins a Stonehenge creation theory.
"Further, of the scores of known glacial erratics on the shores of the Bristol Channel, many are found at altitudes in excess of 100m, indicating that during at least one glacial episode the ice of the Irish Sea Ice Stream was thick enough and dynamic enough to press inland across the coasts of Devon and Cornwall. It is therefore probable that glacier ice also reached Salisbury Plain, and that the bluestone boulders and smaller fragments at Stonehenge — from more than 30 different sources — were glacially transported. "
https://www.researchgate.net/publication/381775577_Quaternary_Newsletter_Article_AN_IGNEOUS_ERRATIC_AT_LIMESLADE_GOWER_AND_THE_GLACIATION_OF_THE_BRISTOL_CHANNEL
The claim is that many glacial erratics are found at altitudes in excess of 100m, and that this fact would indicate all sorts of stuff. And that this is the "abstract" of a paper that has presumably had some sort of review.
So let's look at the paper: An Igneous Erratic at Limeslade, Gower & the Glaciation of the Bristol Channel linked from https://www.qra.org.uk/quaternary-newsletter/qn-162-archive/
What does it say?
Not what the author's abstract says.The references are Harmer's Erratic Map of 1928: Here's the extract, click to embiggen.
No, I can't see any.
Maybe Madgett & Ingliss 1987 references some "high level erratics", after all the convention is that if it is within quote marks it should be a quote:
https://devonassoc.org.uk/wp-content/uploads/2018/11/A-Reappraisal-Madgett-TDA-1987.pdf
Nope.
For the Ilfracombe-Berrynarbour reference see below.
Paul Berry - https://devongeography.wordpress.com/2021/10/27/coastal-walk-at-baggy-point-north-devon/ has some good photos of the Baggy Point erratics - 46, 60 and 80m in altitude. So they aren't part of the many at over 100m. More about them later.
The author of the claim has elsewhere provided a useful table of the erratics he knows of:
Here are some of the recorded altitudes of erratics on or near the coasts of Cornwall, Devon and Somerset:
Lundy 138m
Shebbear 150m
Westonzoyland 10m
Baggy Point 80m, 60m and 45m
Ilfracombe 150m - 175m
Kenn 7m
Court Hill 68m (ice surface was above 85m)
Nightingale Valley / Portishead Down 85m
Let's look at them in turn:
Lundy - the most comprehensive report is https://eprints.soton.ac.uk/380559/1/LFS_Journal_2014-Rolfe_et_al.pdf They are local rocks that have been pushed around on the island, not relevant.
Shebbear - A sarsen stone not a glacial erratic https://sarsen.substack.com/p/the-shebbear-erratic-sarsenhtml
Westonzoyland - 10m - basically within tidal range.
Baggy Point 80m, 60m and 45m -
Yes - under 100m. But the author has repeatedly written about them:https://brian-mountainman.blogspot.com/2023/10/pink-tuff-erratics-from-baggy-point.html
THE RAMSON CLIFF ERRATIC (THE "HIGH ERRATIC" ON BAGGY POINT)
In 1969 this boulder was in the middle of a pasture field, right on the crest-line of Baggy Point above Ramson Cliff, though in a low-point of that crest-line. It was standing upright, part-buried in the thin soil.... in the early 1970s this same farmer decided to plough those fields, initially simply resulting in the boulder being dislodged and lying prone; then shortly afterwards he dragged it to the edge of the field, where it has been ever since, adjacent to the Coast Path,...Some have suggested that this erratic (in its 1969 context) represents a prehistoric Standing Stone - quite feasible, and there is another standing stone nearer to Putsborough, though that one is a local slabby sandstone. Because of the occurrence of erratic boulders on the southern shore of Baggy, at Saunton Down End, and under Saunton cliffs, it was then suggested that the boulder might have been dragged up from such a location. Against this is the shape of the boulder - which is rather angular and rough-surfaced - not at all like those on the foreshore,
What? It is a standing stone that the farmer has moved to the edge of his field. And the others are so small they wouldn't even fill a wheelbarrow, and seem to be moved about at will. The lack of reliable context makes them irrelevant.
Ilfracombe: again we can go back to the blogger behind the claim:
https://brian-mountainman.blogspot.com/2022/03/ilfracombe-erratic-spread.html
The sole reference is to page 202 of https://data.jncc.gov.uk/data/965f9190-c00b-4a6b-aa9f-8e3855492404/gcr-v14-quaternary-of-south-west-england-c7.pdf