Two men and a female colleague have been cleared of all charges, following a protest against the fossil fuel industry as part of the "Just Stop Oil" campaign. They had sprayed some of the Stonehenge sarsens with an environmentally-friendly orange powder. They had denied all charges of damaging an ancient protected monument and causing a public nuisance, after targeting Stonehenge as part of an ongoing fossil fuel protest by the direct action group.
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...
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
Friday, 31 October 2025
Stonehenge and climate change
Two men and a female colleague have been cleared of all charges, following a protest against the fossil fuel industry as part of the "Just Stop Oil" campaign. They had sprayed some of the Stonehenge sarsens with an environmentally-friendly orange powder. They had denied all charges of damaging an ancient protected monument and causing a public nuisance, after targeting Stonehenge as part of an ongoing fossil fuel protest by the direct action group.
Saturday, 25 October 2025
Could the Stanton Drew stones be glacial erratics?
See these:
https://davidrabram.substack.com/p/decoding-stanton-drew
Thanks to Vince Simmonds for the followingn (2023):
Stanton Drew Stone Circles: observations and notes regarding the sourcing of the various rock-types used in the construction of the monuments.
Vince Simmonds BSc PgCert PCIfA FGS
The four main rock types represented in the Stanton Drew circles are as follows:
1. Oolitic Limestone – Jurassic 205 – 142 Ma (figure 3). These rocks are a pale grey- yellow colour, although this is difficult to fully distinguish due to a substantial lichen cover. The surface of the blocks resembles a limestone pavement and has numerous cup-like depressions and pits that partly fill with water. Many rock art sites have flat slabs of stone open to the elements and, when it rains, the cup-and-ring marks fill with water, rocks with natural cup marks are often utilised for the same effect. It could be that places where rocks ran with water or held water were culturally significant in many ways (Fowler and Cummings, 2003: 10). It is possible that some of these limestone slabs at Stanton Drew were not intended to stand or were used as capstones.
2. Silicified Dolomitic Conglomerate - Triassic 248 – 205 Ma (figure 4). These rocks have a wide range of colours from pale pink to orangey pink with some bright, sometimes ochreous orange, through to dark rust, and purple-red blotches, the red and orange colour is indicative of the mineral iron content of these Triassic rock types. The rocks have a glassy, metallic appearance and feel and the surface can be described as pitted, pock-marked, frothy, knobbly, and gnarly. There are abundant quartz geodes that make many of the stones sparkle, William Stukeley (cited in Lloyd Morgan, 1887: 39) remarks that “it shines eminently and reflects the sunbeams with great lustre”. Quartz was a highly significant and regarded material in prehistory as indicated through its use in various monuments (Lewis: online accessed 2010). There are some silicified fossil fragments from the remains of limestone clasts within the conglomerate. The varying clasts range from sub-rounded to sub-angular, fine to coarse gravel to pebble and cobble size. The majority of the stones have a substantial cover of lichen with some moss and grass.3. Dolomitic Conglomerate – Triassic (figure 5). This is a weathered pale grey-pink and has a lesser degree of silicification. The varying clasts range from rounded to sub- angular fine to coarse gravel, pebbles and cobbles of limestone and sandstone. There are also some silicified fossil fragments from the remains of limestone clasts within the conglomerate and the stones again have a substantial cover of lichen.
Rhosyfelin -- the story is changing
This is interesting. After 15 years of maintaining the pretence that the exposed rhyolites at Craig Rhosyfelin are unique, and characterised by a "Jovian fabric", Bevins and Ixer are at last admitting that things are a great deal more complicated than that.
On many occasions I have strongly criticized the use of the invented term "Jovian fabric," arguing that it is misleading and not a unique characteristic. Similar foliated and lensoidal textures can be found in other heavily deformed rhyolites and volcanic tuffs across Pembrokeshire and other regions, as pointed out in my post:In standard petrology, the textures of igneous rocks are classified using widely accepted terms like aphanitic, phaneritic, porphyritic, and vesicular, which describe grain size, crystal formation, and gas content. Terms like "foliated" and "lensoidal" describe structural characteristics, often related to metamorphic processes that affect igneous rocks, and these are far from unique to one location. A rock with a fabric resulting from intense tectonic stress is not an anomaly; it is a common feature in many geological settings where ancient volcanic rocks have been subjected to mountain-building events.
In summary, the "Jovian fabric" is a non-standard, invented term. Its perceived uniqueness has to be questioned, and its use as definitive proof for the human transport of the bluestones is frankly absurd.
Ixer, R.A and Bevins, E.R (2011) Craig Rhos-y-Felin, Pont Saeson is the dominant source of the Stonehange rhyolitic ‘debitage’; in Archaeology in Wales 50, 21-31
https://brian-mountainman.blogspot.com/2011/12/on-significance-or-otherwise-of-999.html
Wednesday, 22 October 2025
More on the Silbury Hill bluestone fragments
We have talked a lot about these fragments in the past -- use the search facility to track down previous posts. Now there is a new note by Ixer, Bevins and Pollard which examines the petrography of the stones in more detail and which suggests matches with other bluestone fragments scattered across the landscape.
"Bluestones from Silbury Hill" by Ixer, Bevins and Pollard
Wiltshire Archaeological & Natural History Magazine, vol. 118 (2025), pp. 270–309
https://www.academia.edu/144003051/Slbury_Hill_lithics
Tuesday, 21 October 2025
Jehu on Pembrokeshire's Scottish connection
One of my great academic heroes is TJ Jehu, who was decades ahead of his time in his analysis of the glacial landforms and features of North Pembrokeshire.
The Glacial Deposits of Northern Pembrokeshire. By T. J. Jehu, M.D. (Edin.), M.A. (Camb.), F.G.S., Lecturer in Geology at the University of St Andrews. 1904. TRANS. ROY. SOC. EDIN., VOL. XLI. PART I. (NO. 4).
Rockfall scar, East Greenland
I'm not sure of the location, but this is somewhere in the East Greenland fjords. If we zoom in we can see the effects of spalling or exfoliation on the curving rock faces (we see similar features on granite domes and prominent peaks such as El Capitan). But by far the most spectacular feature here is the massive scar left by a single rock face collapse. We don't see much sign of different generations of slope failure here, but there may have been several "events". The essential mechanism is almost always pressure release following deglaciation.
Anyway, if there was a single big event here, it must have been quite something...........
They MAY have intended us to take it with a pinch of salt........... and maybe not
=====================
The significance -- or insignificance -- of distant stone sources
(an external view of the wording)
Jon Morris
If the builders of Stonehenge wanted stones from everywhere in order to cement a "unification project", why have the stones all come from one narrow compass direction? It's a good question and one I wondered when I read it the first time. But the paper itself has a specific wording in the introductory Abstract: “Such connections may be best explained through Stonehenge’s construction as a monument of island-wide unification, embodied in part through the distant and diverse origins of its stones.” This is a true statement. They may be. That particular use of language indicates a likely outcome in the author's opinion. There's a useful blog about it here: https://www.grammarly.com/blog/commonly-confused-words/may-might/
But we have no way of knowing because there is no agreed framework of experts, to which the public can refer, to get an idea of the most likely answer (or answers). One can also substitute other hypotheses into this wording. To take an extreme example, let us say that the alternative hypothesis was that Stonehenge was built by Aliens (possibly with bases in Scotland and Wales). “Such connections may be best explained through Stonehenge’s construction as a monument of Alien origin.”
This is also a true statement. They may be (again in the author's opinion). We have no way of knowing because there is no agreed framework, to which the public can refer, to get an idea of the most likely answer (or answers). One can also substitute other hypotheses into this wording. For another less extreme example, let us say that the alternative hypothesis was that Stonehenge was transported by glaciers).
“Such connections may be best explained through Stonehenge’s construction as a result of happenstance due to glacial transport.” This is also a true statement. But again we have no way of knowing. One can also substitute almost any other hypotheses into this wording.
Moving on to the conclusion:
Finally, the distant origin of the Altar Stone confirms Stonehenge’s unique status as the one stone circle built entirely from non-local stone; a material microcosm projecting at an enormous scale. It is consistent with recent interpretations of Stonehenge as a monument whose builders attempted – ultimately unsuccessfully – to establish some form of political unification and shared identity across much or even all of Britain, bringing together these extraordinary and alien rocks which symbolised and embodied far and distant communities within a complex material and monumental expression of unity between people, land, ancestors and the heavens.
This is also a true statement given the use of “may” in the introductory abstract, (rather than “can” or “is” or other related more definitive verbs), These findings are consistent with a possibility (that may be true) for which no probabilistic evidence is given as to its likelihood.
It's perhaps unfortunate if the paper has given the impression that this hypothesis might be a best explanation. However, it might well be. Nevertheless, the paper doesn't say that it is the best explanation. If the paper had said that it is the best explanation, then it would have to have provided evidence of comparison to other hypotheses.
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Sunday, 19 October 2025
The significance -- or insignificance -- of distant stone sources
Parker Pearson, M., Bevins, R., Bradley, R., Ixer, R., Pearce, N. & Richards, C., (2024) “Stonehenge and its Altar Stone: the significance of distant stone sources”, Archaeology International 27(1), 113–137.
doi: https://doi.org/10.14324/AI.27.1.13
Thursday, 16 October 2025
Stranger than fiction............
Holger Danskes Briller trough, south-facing slope at the western end of the eastern lake. The two huge rockfall avalanche ramparts are very prominent.......
In my novel "Icefall Zero", set in East Greenland ion 1962, one of the critical incidents is a sudden rock avalanche which overwhelms and almost kills two of the heroes, in a glacial trough containing two large lakes. The trough carried diffluent ice from the huge glacier that once flowed along Nordvestfjord. (See some recent posts.........)
When we were in East Greenland in 1962 we never got a good look at the trough because of bad weather, and its slopes were mostly enveloped in low cloud. Our maps and air pohotos were also of very limited use. When I wrote the novel in 2014 the information was not much better, and satellite images of the area were of poor quality, partly because the details of the valley sides were often lost in deep shadow. But I thought the steep slopes looked unstable, especially in the middle section of the trough, where there are some high buttresses and peaks over 1000 m high.
So I invented my rock avalanche and described its effects in graphic detail in the story..........
Imagine my surprise when I examined the new Bing / TomTom satellite imagery some weeks ago and discovered amazing detail of the slopes in the trough, especially on the sunny (south facing) flank. There are multiple gullies on the cliff face, with long histories of intermittent rockfalls and probably snow avalanches too. But there are two especially prominent features, characterised by huge ridges or ramparts at their bottom ends. These are much more likely to have been the result of single sudden catastrophic slope failures. Such features are very common in NW Iceland too, beneath steep basalt cliffs subject to pressure release following deglaciation.
Each of the ramparts is about 200m wide. On the satellite imagery the ramparts and upslope scree slopes have slightly different colourations, suggesting to me that the eastern one is somewhat youngerc than the western one. How recent were these slope collapses? At the moment, the jury is still out, but I would hazard a guess and suggest that they may be very recent, from within living memory. In 1962, maybe.....??
I would not have liked to be anywhere in the vicinity when either one of these slope failures actually happened........
Monday, 13 October 2025
More on Cunnington's rock samples and slides
This is an unpublished catalogue recently placed on Academia -- and therefore not accessible to everybody. It looks as if it is a prelude to a longer and more detailed paper due to be published next year by the Ixer / Bevins duo.
https://www.academia.edu/144337293/Cunningtons_Stonehenge_rocks_an_archive_of_the_thin_section_data
Cunnington's Stonehenge rocks: an archive of the thin section data.By Robert Ixer
referring to: William Cunnington Stonehenge rock thin sections catalogue
Canada Balsam has yellowed with age. A uniform, fine-grained (fine sand ≤187 µm grain size),
carbonate-cemented, poorly developed planar laminated sandstone is a dusky yellow (5Y 7/4 on the
Geological Society of America Rock-color chart). Short and thin, 0.1 mm thick, heavy mineral bands are
present and phyllosilicate-rich layers are more limonite stained. The centre of the slide is more
limonite-stained than the edges but this might be a thickness effect. A sinuous ‘stylolitic’ band lies at a
high angle to the laminae. Approximately 50% of the section is cloudy, suggesting the presence of
carbonate.
A fine-grained, well-cemented, calcareous sandstone. The planar fabric is picked out by heavy mineral
and by phyllosilicate (muscovite, biotite, chlorite) bands/laminae, the latter are slightly more limonite-
stained than most of the rock. Clasts display a severely restricted size range and are dominated by
monocrystalline, sub-angular to sub-rounded quartz grains; quartz and feldspars show elongation
within the planar fabric. Smaller heavy mineral grains are rounded, especially the opaques. In addtion
to quartz, plagioclase, untwinned feldspar, muscovite, biotite and chlorite are the main silicates; rock
clasts are common and are internally very fine-grained and appear to be clay-rich. Accessory minerals
include opaques, zircon, tourmaline, apatite, probable rutile and garnet and possible amphibole.
Monocrystalline quartz shows uniform extinction and ‘float’ within the carbonate cement. Where
quartz grains touch contacts are sharp and there is no overgrowth or embayment. Unaltered,
polysynthetically twinned plagioclase is more abundant than slightly altered pale brown plagioclase
(altering to fine-grained white mica). Untwinned feldspar is pale brown and cloudy and may include
potassium feldspar. Microcline was not recognised.
Phyllosilicates are abundant and in order of decreasing abundance are muscovite, biotite and chlorite.
All three form laths lying within the main fabric but also, rarely, occur at high angles to that fabric; all
show kinking about quartz and feldspar grains. Some muscovite laths show splaying at their ends and
some biotite is altered to chlorite. Chlorite also is present as, or within, fine-grained rock clasts.
Chlorite with deep blue-green colours may be pumpellyite.
Heavy mineral bands are quite broad and are dominated by rounded opaques and rounded to
subhedral zircon, murky green-brown tourmaline, rounded to lath-shaped apatite and elongated
brown rutile; rounded garnet and possible amphibole are also present.
Rock clasts, many are rounded, are widespread and all are internally very fine-grained. Many appear to
be phyllosilicate/clay rich or fine-grained micrite but some fine-grained polycrystalline quartz,
including ‘chert’, is present. Feldspar-rich rocks, including graphic granite are very rare.
Minor amounts of kaolinite, some associated with muscovite, is a very local cement. The main cement
is carbonate; some is poikoblastic calcite. Two generations of cement may be present, namely an
earlier high relief, brownish carbonate followed by clear, lower relief calcite.
Cunnington (1884) recognised the presence of “micaceous sandstone” debitage and suggested that it
might be the Altar Stone. Teall (1894) listed S45 within his “Grits and Sandstones”, suggesting that
most “do not seem to be in any way remarkable”, while Judd (1902) noted that un-numbered Altar
Stone was a micaceous sandstone but found with “other more micaceous sandstones”. Harrison et al.
(1979) noted S 45 as “Fine sandstone, feldspathic, (0 06 mm) well-graded, carbonate cement; micas
common, and heavy minerals conspicuous (garnet, tourmaline, zircon)”.
Sunday, 12 October 2025
A classic lateral moraine in Kjove Land, East Greenland
Thanks to the new Bing satellite imagery, we can see extraordinary detail in Kjove land, East Greenland -- tha area dealt with in some previous posts. Note the huge lateral moraine running along the mountainside to the east of the Holger Danskes Briller ice contact delta. I have marked the key features on the above image. In 1962 we were unable to examine this area in detail, as we had our work cut out in the examinations and analysis of the Gurreholmsdal raised delta complex a few km to the east. Anyway, the moraine has a series of cosmogenic dates reported in the recent paper by Kelly et al, ranging from c 15,000 yrs BP to c 12,000 yrs BP. So the moraine is assigned to the "older moraine complex" roughly coinciding with Zone I or Older Dryas in the old terminology.
The diffluent glacier snout was grounded for at least 4 km to the east iof the trough exit, and must have been afloat in the Nordostbugt area. The 134m shoreline is traceable downslope of the morainic ridge, but its precise relationship with raised marine deposits is still to be determined.
https://doi.org/10.1016/j.quascirev.2025.109531
PS. The eastern lake of the Holger Danskes Briller is now named Margaret Lambert Sø. You can see the eastern edge of the lake in the image above.
Tuesday, 7 October 2025
Kjove Land -- ice flow west to east, or east to west?
Relative summer temperature changes from glacial fluctuations in the Scoresby Sund region, Central East Greenland, during late-glacial time (2025)
Meredith A. Kelly, Thomas V. Lowell, Brenda L. Hall, Laura B. Levy, Colby A. Smith, Katherine Salamido, Roseanne Schwartz and Jennifer A. Howley
Quaternary Science Reviews
Volume 367, 1 November 2025, 109531
Abstract
Understanding climate conditions in the mid-to-high-latitude North Atlantic region during late-glacial time can provide valuable information to test hypotheses concerning the mechanisms of climate change that ended the last glacial period. Glaciers (particularly mountain glaciers) are sensitive recorders of summer temperature change because of its influence on the ablation season, snowline elevation and, hence, glacier length. Here, we develop a record of glacial fluctuations in the Scoresby Sund region in Central East Greenland and use these data to infer the timing and pattern of summer temperature changes in the mid-to-high-latitude North Atlantic region. We present 64 new 10Be ages of glacial landforms and remap and recalculate an additional 65 10Be ages from prior work in the region. Even with boulders with inherited nuclides in some of the datasets, a two-step pattern of glacial fluctuations is apparent, with an outer moraine dating to ∼14.0–12.8 ka, an inner moraine dating to ∼11.7–11.3 ka, and ice retreat in the time between moraine deposition. A comparison of these data with 10Be chronologies of mountain glacier fluctuations in Northeast Greenland, Svalbard, Norway and Scotland, shows a consistent pattern throughout the mid-to-high-latitude North Atlantic region of summer cooling and warming during late-glacial time.
In both Holger Danskes Briller and Kjove Land, prominent lateral moraines demarcate a relatively young landscape (proximal to the moraines) from this older, more weathered landscape (distal to the moraines). Lateral moraines occur on both walls of Holger Danskes Briller and mark the margins of a glacier that filled the valley and flowed into Nordostbugt (Fig. 3, Fig. 6). On the right-lateral (south) valley wall, these moraines are contiguous with moraines in Kjoveland that mark the left-lateral margin of an ice-sheet outlet that filled Nordvestfjord. All these moraines are relatively high relief and have high surface boulder concentrations. Based on the geomorphology and elevations of the highest elevation lateral moraines in Holger Danskes Briller (both ∼300 m asl) and Kjoveland (∼260–280 m asl), we assume that they were deposited at the same time. 10Be ages of thirteen boulders on these highest elevation moraines are ∼11.8–18.9 ka. Multiple lateral moraines occur on the slopes below the highest moraines. We dated five boulders on lower elevation moraines (∼190–240 m asl) in Kjoveland. Four ages are ∼12.1–16.4 ka and one (∼30.4 ± 1.1 ka, MKG-71) is a statistical outlier. Based on their prominence and position at a weathering boundary, we consider all of these landforms to be associated with the outer moraine set. They consist entirely of lateral moraines and lack terminal features, possibly because the ice terminated offshore. The peak age of the moraines is ∼12.2 ka (n = 17) and the youngest age is ∼11.8 ± 0.4 ka (MKG-179)(Fig. 6).
In contrast, on the Holger Danskes Briller valley floor, an ice-contact delta is spectacularly preserved, with a steep and boulder-covered ice-contact slope and kettles and meltwater channels on its surface (Fig. 3E). The upper delta surface is at ∼101 m asl. 10Be ages of seven boulders on the delta are ∼11.6–15.3 ka with a peak age of ∼11.7 ka (n = 7) and youngest age of ∼11.6 ± 0.3 ka (MKG-172)(Fig. 6). Given the substantial distance between inferred minimum terminal ice positions of the outer moraines and this ice-contact delta, as well as the fact that the delta grades to 101 m asl, well-below the 135 m asl sea level associated with at least one outer moraine in Gurreholm Dal, we conclude that the delta is associated with the inner moraine set.
Because of its association with a sea level at 101m, the authors suggest that the HDB feature is one of the "inner moraines", linked in age (c 11,000 yrs BP) and origin to some of the moraines associated with the glaciers in the Schuchert Valley.
Sampling point 83, labelled as "distal to moraines" should have been labelled "proximal to moraines" because it is inside the diffluent glacier morainic loop. This makes sense, because the date (13,600 yrs BP) is younger than some of those obtained from boulders on the moraines themselves.
1962 photo of the highest morainic ridge -- virtually the same view as that in one of the photos published above.
Sunday, 5 October 2025
The Nordvestfjord "bench"
Saturday, 4 October 2025
Nordvestfjord -- a new image
There is enormous detail -- click to enlarge.
Nordvestfjord middle reaches
J. A. DOWDESWELL, C. L. BATCHELOR, K. A. HOGAN & H.-W. SCHENKE
The fjord walls on the west side of this outer zone are steeper than in the inner zone, and are sustantially more broken up as a result of complex interactions between the main Nordvestfjord glacier and abundant tributary glaciers flowing from ice caps and from smaller "alpine" glacier catchments.
Here we see the same area as featured at the head of this post.
Asymmetric cross profile of Nordvestfjord trough are clearly seen in the middle section.
This photo shoes the various elements in Gåseland. The photo below shows Nordvestfjord, in its middle section: