Friday, 14 November 2025
War Time Baggy Point
1924 Station Stones Solsticial alignments
Tuesday, 11 November 2025
The Sanctuary 1925
Photograph taken by William Williams during an overseas holiday he took with Lydia Williams between 1925 and 1927.
It is always satisfying when you recognise a view in an old photograph:
Wednesday, 5 November 2025
The Fremington Clay Erratics
The Fremington Clay Erratics
Tim Daw All Cannings Cross, Wiltshire, UK Email:
tim.daw@gmail.com
© Tim Daw 2025. This work is licensed under a Creative
Commons Attribution 4.0 International License (CC BY 4.0). To view a copy of
this license, visit http://creativecommons.org/licenses/by/4.0/
A definitive
list of all the erratics identified from the Fremington Clays, Devon, with a
refreshed interpretation and conclusion.
|
Erratic No./Name/Location |
Lithology/Type |
Description & Key Features |
Original Source Suggestion |
Modern Interpretation/Source |
Primary Reference(s) |
|
Boulder III / No. 6 / Maw's boulder (quarter mile east
of Combrew Farm; moved to Combrew Farm garden; Bickington clay-bed) |
Spilite / Vesicular granophyre (pillow-lava type; early
ID: basaltic trap) |
Dark grey, finely crystalline; small white porphyritic
albite felspars (plates/laths); micropegmatite groundmass; vesicular with
pleochroic calcite infill; chlorite replaces scarce ferromagnesian minerals;
no free quartz; ~40 x 30 x 25 inches; no striae or wedge-shape; longest axis
E-W. Recorded as isolated in middle of clay-bed (Unit B); early description
as large striated basaltic trap. |
North/East Cornwall spilites (altered basalts);
possible but uncertain import. |
Cornish spilitic pillow lavas (Meneage district); or
local SW England volcanics (e.g., Meldon spilitic lavas with chlorite-epidote
alteration and granophyric overprint); periglacial/fluvial reworking; glacial
dropstone or reworked. |
Maw (1864); Dewey (1910); Taylor (1956); Arber (1964);
Croot et al. (1996) |
|
Boulder IV / No. 7 (Combrew Farm garden; later
Chilcotts Farm gate-post) |
Hypersthene andesite / Hyalopilitic andesite |
Dark grey-green, glassy, porphyritic, brittle; large
pale olive-green acid labradorite felspars (two generations, ~50% rock
volume, fresh, twinned on albite/pericline laws, zonal inclusions, RI=1.560 =
50% Ab-An); rhombic pyroxene (hypersthene) prisms only ferromagnesian (no
augite/hornblende/olivine); abundant magnetite (rods/feathery/gridiron); ~50%
brown glass base with zonal borders; ~16 inches across; well-rounded. Found
~22 ft below surface c. 1870. |
West coast Scotland (e.g., Watt Carrick, Dumfries; Loch
Craignish, Argyll); tentative, differs by lacking augite. |
Local SW dykes (Tamar/Dartmoor); matches
hypersthene-phyric andesite lenses in Meldon tuffs; no long-distance glacial
transport needed. |
Dewey (1910); Taylor (1956); Arber (1964); Croot et al.
(1996) |
|
No. 8 (Fishley Pottery clay-pit; now near old pottery
gate, approaching Combrew Farm) |
Quartz porphyry |
Light grey, holocrystalline, granitic texture; altered
felspar/quartz phenocrysts (up to 5 mm, avg. 3 mm); little mica; fine pale
base; amorphous red matrix; crushed/irregular plagioclase, porphyritic
quartz, long apatite prisms; epidote replaces mosaic; lichen-covered; flat
top/base; 47 x 19 x 16 inches. |
Local source (e.g., porphyritic dyke west of
Devon/Cornwall coasts). |
Devon–Cornwall intrusions (e.g., rhyolitic dykes/sills
near Mary Tavy with devonisation); possible non-local Cornish alternative. |
Taylor (1956); Croot et al. (1996) |
|
No. 9 (Brannam's pits, Tews Lane, Bickington; through
coarse white clay) |
Quartz dolerite |
Grey, highly crystalline/compact; fine-grained
granite-like texture; soft milky-white kaolinized felspar (lath outlines);
trace quartz (primary); reddish fresh augite (slight edge alteration); little
magnetite/secondary calcite; long needle apatite prisms with inclusions;
ellipsoidal, rounded; lower mean weight; no sub-ophitic texture. Found in
middle of brown clay. |
Local Devon intrusions; no diagnostic distant features. |
Dartmoor dykes (e.g., Meldon dolerite sheets);
hydrothermal alteration common; fluvial entrainment via Taw/Okement. |
Taylor (1956); Arber (1964); Croot et al. (1996) |
|
No. 10 (Brannam's pits; far side of pit surface, two
pieces) |
Olivine dolerite |
Darker grey, more crystalline than No. 9; soft felspar
crystals with calcite (weak acid reaction); micro-pegmatitic ophitic
structure with crossed flows; plagioclase tabs enclosed; transverse ilmenite
prisms; yellow olivine grains; slight quartz orientation; some felspar
extinction; ~300 lb; irregular/angular. |
Local Devon; common type. |
Devon minor intrusions (e.g., aureole basic sheets);
fresh, with diagnostic apatite; local reworking. |
Taylor (1956); Arber (1964); Croot et al. (1996) |
|
No. 13 (Brannam's pits, 1962 excavation) |
Quartz dolerite |
Similar to No. 9; specifics limited; found ~10 ft from
top of clay. |
Unspecified local. |
As per No. 9; unified aureole source. |
Vachell (1963); Arber (1964); Taylor (1956, implied) |
|
Unidentified boulder 1 (Brannam's pits, pre-1957) |
Unspecified igneous |
Smooth, rounded; ~19 inches long; excavated 10 ft below
upper surface of clay. |
Unspecified. |
Likely local mafic/intermediate; embedded in clay
heart. |
Arber (1964) |
|
Unidentified boulder 2 (Brannam's pits, 1957) |
Unspecified igneous |
Smooth, rounded; size unspecified; excavated 16 ft
below upper surface of clay. |
Unspecified. |
As above. |
Arber (1964) |
|
Olivine-dolerite pebble (Brannam's pits, 1955) |
Olivine dolerite |
Small pebble; 2–3 ft above clay base; similar to No.
10. |
Local Devon. |
As per No. 10; pre-depositional wear. |
Taylor (1956); Arber (1964) |
|
Carboniferous grit slab (Brannam's pits) |
Carboniferous grit (sedimentary) |
Waterworn slab; ~5 inches, 1.25 inches thick; flat
surfaces with red ferric oxide skin (infiltration along bedding cracks). |
Local Carboniferous. |
Okement-derived; waterworn pre-inclusion; minor
erratic. |
Taylor (1956) |
|
Dolerite boulder (Brannam's pits / potter's clay;
removed post-discovery) |
Dolerite (unspecified) |
Large (1–5 tons); erratic in stoneless potter's clay
(Unit B/C); similar to Saunton Downend erratics. |
Unknown provenance. |
Local (e.g., Culm Measures intrusives); dropstone in
quiet-water deposit. |
Wood (1973/1974); Croot et al. (1996) [N.B.: Arber (1964) cited by Wood for context, but
describes distinct smaller clasts, pace Croot et al.] |
|
Granodiorite boulder (Brannam's pits / potter's clay;
removed post-discovery) |
Granodiorite |
Large (1–5 tons); erratic in stoneless potter's clay
(Unit B/C); similar to Saunton Downend erratics. |
Unknown provenance. |
Possible exotic (Irish Sea); but aligns with local
granites (e.g., Dartmoor); |
Wood (1973/1974); Croot et al. (1996) [N.B.: Arber (1964) cited by Wood for context, but
describes distinct smaller clasts, pace Croot et al.] |
|
Small striated alkali micro-dolerite cobble (Higher
Gorse pits, 1994 excavation / Brannam's pits, Unit B; 5 m depth) |
Alkali micro-dolerite |
Small striated boulder/cobble (flat-iron subglacial
type with exceptionally well-striated faces); in main clay unit (Unit B);
~50% plagioclase felspar phenocrysts (poorly twinned, skeletal, zoned,
sericite-altered); altered ferromagnesian minerals (chlorite pseudomorphs);
titaniferous augite laths; numerous unfilled vesicles. |
Unspecified; first unequivocal glacial transport. |
Local basic intrusive; glacially transported in-situ
clast (dropstone from iceberg/glacier); supports glaciolacustrine origin. |
Croot et al. (1996); Gilbert (pers. comm.) |
|
Trachy-andesite (Pen Hill, Taw Estuary beach/estuarine
sand) |
Trachy-andesite |
Partially buried boulder; specifics limited. |
Unspecified. |
Possible western British source; estuarine reworking. |
Croot et al. (1996); Gilbert (pers. comm.) |
|
Grey elvan (general Fremington area) |
Grey elvan (porphyritic dyke rock) |
Quartz-felspar porphyry type; specifics limited;
multiple occurrences. |
Local dykes (Devon/Cornwall). |
As per No. 8; common in aureole. |
Taylor (1956); Croot et al. (1996) |
|
Miscellaneous till erratics (Brannam's pits; Units B/D) |
Varied (dolerite, granite, gneiss, flint, local
Devonian/Carboniferous grits/shales/sandstones/limestones) |
Sub-angular/rounded pebbles/cobbles/boulders; in
lodgement till; includes striated stones, lignite, shell fragments; derived
microfauna (e.g., Nonion labradoricum). |
Irish Sea Basin (e.g., flint from Chalk, gneiss/granite
exotics). |
Mostly local (10 km radius, e.g., Culm gravels); rare
exotics via ice-rafting; supports Irish Sea ice oscillations. |
Stephens (1966); Wood (1974); Croot et al. (1996) |
Conclusion
The Fremington Clay erratic assemblage is dominated by
lithologies that can be sourced within the immediate South-West England bedrock
province, particularly the Culm Basin, Dartmoor aureole, and Cornubian igneous
suite. The petrography, rounding, and stratigraphic context of the larger
clasts indicate derivation and short-distance transport within local fluvial
systems and, at times, by locally confined ice or ice-rafted debris. A very
small number of rounded pebbles, including rare far-travelled lithologies, may
reflect limited marine or estuarine ice-rafting rather than sustained glacial
incursion. Crucially, all confirmed erratics occur at elevations of
approximately 10 - 20m OD, with no verified examples above this level. This
altitude constraint strongly suggests that the Fremington deposits record
low-level glacial–marginal or proglacial processes, rather than a substantial
high-level Irish Sea ice lobe overriding the North Devon coast. It is essential
to distinguish between the erratics of the Fremington Clay Series and those
associated with the Saunton raised beach deposits, lest they be conflated in
discussions of Quaternary glaciation in North Devon. Saunton's assemblage
features larger, more exotic boulders—such as granites and gneisses potentially
ice-rafted from the Irish Sea Basin—resting on shore platforms at similar
elevations but indicative of marine incursion during sea-level highstands. The evidence is therefore consistent with a
landscape influenced by local fluvial and periglacial dynamics, episodic
ice-rafting, and short-distance glacially assisted transport, rather than
long-distance inland ice movement.
Photographs:
No.6 – Taylor 1956
No. 6 – Tim Daw – Nov. 2025 (rotated compared to Taylor’s
photograph) https://maps.app.goo.gl/8uvFckNu1TB7BFhd6
No.7 - Taylor – 1956
No.7 - Tim Daw – Nov
2025. https://maps.app.goo.gl/ijcV53LLrDUywAKR8
No. 8 – Taylor - 1956
References
·
Arber, M.A. (1964) Erratic boulders within the
Fremington Clay of North Devon. Geological Magazine, 101, 282–3.
·
Croot, D.G., Gilbert, A., Griffiths, J. and Van
Der Meer, J.J. (1996) The character, age and depositional environments of the
Fremington Clay Series, north Devon. In The Quaternary of Devon and
East Cornwall: Field Guide (eds D.J. Charman, R.M. Newnham and D.G.
Croot), Quaternary Research Association, London, pp. 14–34.
·
Stephens, N. (1966) Some Pleistocene deposits in
North Devon. Biuletyn Peryglacjalny, 15, 103–14.
·
Taylor, C.W. (1956) Erratics of the Saunton and
Fremington areas. Report and Transactions of the Devonshire Associaton
for the Advancement of Science, Literature and Art, 88, 52–64.
·
Vachell, E.T. (1963) Fifth report on
geology. Report and Transactions of the Devonshire Association for the
Advancement of Science, Literature and Art, 95, 100–7.
·
Wood, T.R. (1974) Quaternary deposits around
Fremington. In Exeter Field Meeting, Easter 1974 (ed. A.
Straw), Quaternary Research Association Handbook, Exeter, pp. 30–4.
Sunday, 2 November 2025
Buried landscapes of the Avon Riverside and the Mesolithic of the Stonehenge Area.
The Buried Landscapes project is a multi-institution, interdisciplinary research programme that maps and dates the buried Holocene sediments, palaeochannels and loess deposits around the River Avon and the eastern margin of the Stonehenge landscape (the Blick Mead / Vespasian’s Camp–Amesbury area). Its goal is to recover long environmental sequences preserved beneath later sediments so palaeoecological proxies (pollen, sedaDNA, macrofossils), OSL/14C dating and geoarchaeology can reconstruct valley evolution, wetland formation and the timing of open vs. wooded conditions prior to monument construction. The project is described on the UK Research and project partner pages and brings together universities (Southampton, UCL, Bradford, Leipzig, etc.) with specialist geoarchaeological teams.
Closely linked is the focused research on Blick Mead, the chalk-spring locality just east of Stonehenge, which provides an exceptionally long and rich Mesolithic sequence of human activity, faunal remains and environmental samples. Multi-proxy studies from Blick Mead (pollen, sedimentary DNA, faunal analysis) indicate repeated Mesolithic occupation in a partially open clearing exploited for large ungulates (aurochs, deer) over millennia — a setting that would later have been amenable to Neolithic monument builders because large open patches already existed. Publications and project reports (including a detailed PLoS ONE study) show how environmental reconstructions from Blick Mead directly inform hypotheses about landscape continuity from Mesolithic hunter-gatherers to Neolithic ritual activity.
Methodologically the Buried Landscapes programme ties palaeoenvironmental cores, sedaDNA and geochronology to the legacy of the Stonehenge Riverside and related regional projects: where the earlier Stonehenge Riverside Project established links between rivers, monuments and movement across the Avon–Salisbury Plain corridor, the buried-landscapes work supplies the sedimentary and dating framework that explains why particular places (springheads, terrace edges, palaeochannels) attracted people in the Mesolithic and remained important through the Neolithic. In practice this means combining LiDAR/geomorphology, borehole logs and OSL dating with artefact distributions and HER/CRM records to relocate palaeochannels and targeted test excavations.
The project’s broader significance is twofold. First, it reframes the Stonehenge zone as a longue durĂ©e landscape with deep Mesolithic roots — not an empty prehistory cleared only by Neolithic farmers — which affects interpretations of monument placement, access and memory. Second, by producing a fine-grained environmental chronology across the Avon corridor, it provides a template other regional studies can use to locate buried Mesolithic deposits (e.g., springheads, gravel rises) and to integrate geoarchaeology with lithic/faunal assemblage studies across southern Britain. The Buried Landscapes outputs therefore sit as a crucial bridge between site-level discoveries (Blick Mead, Ufton Bridge, etc.) and wider questions about cultural continuity, mobility and the environmental preconditions for monumentality.
In addition to the long‐term palaeoenvironmental sequence around the Stonehenge corridor, geo-archaeological investigations at Jubilee Gardens, Ringwood, on the lower Hampshire Avon floodplain have provided a high-resolution sedimentary record for the early Holocene and later. Two boreholes drilled in March 2022 revealed basal deposits that date to the early Neolithic (c. 3530-3370 cal BC) and show transitions from alder-carr and wetland vegetation to more open grassland, then later wetter conditions and floodplain re-working. These results offer a rare opportunity in the Avon valley to contextualise human activity and environmental change: even where no direct Mesolithic occupation has been found at the site, the geological model helps to explain the formation of potential Mesolithic surfaces, palaeochannels or gravel rises across the floodplain, and therefore helps target where Mesolithic remains might survive.
Hudson, S. M., Pears, B., Jacques, D., Fonville, T., Hughes, P., Alsos, I. G., … & Brown, A. G. (2022). Life before Stonehenge: The hunter-gatherer occupation and environment of Blick Mead revealed by sedaDNA, pollen and spores. PLoS ONE 17(4): e0266789. https://doi.org/10.1371/journal.pone.0266789
-
Brown, A. G. et al. (2022). Buried landscapes of the Avon Riverside and the Mesolithic of the Stonehenge Area. AHRC Research Project. University of Southampton. https://gtr.ukri.org/projects?ref=AH/W002868/1
-
University of Southampton. (2022, April). Study reveals Stonehenge landscape before the world-famous monument. https://www.southampton.ac.uk/news/2022/04/blick-mead.page
-
The Deutsches Archäologisches Institut. Project Overview: Buried landscapes of the Avon Riverside and the Mesolithic of the Stonehenge Area. https://www.dainst.org/en/research/projects/noslug/579
- Taylor, J., Langdon, C. T., Scaife, R. & Cameron, N. G. (2025) The River That Swallowed the Ringwood Prehistoric Landscape: Geoarchaeological investigations in advance of the development of the A31, Hampshire, England. Internet Archaeology, 69. https://doi.org/10.11141/ia.69.6
- AOC Archaeology Group (2025) Digital Archive from a Geoarchaeological Borehole Evaluation at Jubilee Gardens, Ringwood, Hampshire, March 2022. Archaeology Data Service. https://doi.org/10.5284/1129480
Additional thematic context: People visited Stonehenge site thousands of years before it was built – dating studies (ScienceDirect article) https://www.sciencedirect.com/science/article/pii/S0262407922007898
