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History of Geology Group @hoggroup.bsky.social · 4h

His geological lecture room was around the corner from this main entrance. Although the interior has changed since Buckland's day, it is possible to work out where the room was from Nathanial Whittock's 1823 drawing/lithograph by lining up the buildings on the opposite side of The Broad.

The Geological Lecture Room, Oxford:
Dr. William Buckland Lecturing on February 15, 1823.

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Tom Sharpe @tomsharperocks.bsky.social · 5h

Lovely to be back in Oxford. Here’s the old Ashmolean Museum where William Buckland lectured and discussed the fossils found by Mary Anning in the 1820s.

Old stone building with steps and columns at its entrance.

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History of Geology @historyofgeology.bsky.social · 04/10/2026

October 4, 1836, after 5 years geologizing around the world, Charles #Darwin returns back home in Shrewsbury. Darwin's first geologcial map ever shows his hometown's surroundings & it seems he was especially interested in Carboniferous-Permian rocks⚒️

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History of Geology Group @hoggroup.bsky.social · 04/10/2026

For those who are not familiar with this (hi)story, Murchison and his wife Charlotte, first called on Mary Anning three weeks prior to this visit (on 14 September 1825). Murchison's account of that first visit is related here www.geolsoc.org.uk/the-library/...

geolsoc.org.uk

The Geological Society - Roderick Murchison's account of meeting Mary Anning, 1825

Discover and access geoscience information resources via one of the world’s premier Earth science libraries. Search our collection of printed books, maps and journals, e-journals, internet resources, ...

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Tom Sharpe @tomsharperocks.bsky.social · 04/10/2026

4 October 1825: back in Lyme Regis after a tour of SW England, geologist Roderick Murchison noted in his journal, 'Accompanied by Mary Anning rode to Dowlands & dismounted there'. They spent the day exploring the geology of the landslipped cliffs and foreshore to the west of Lyme.

Top left, portrait of Roderick Murchison as a young(ish) man with long sideburns; bottom left, portrait of Mary Anning in a green cloak and straw bonnet; top right, extract from Murchison's journal 'Oct 4th 1825 Accompanied by Mary Anning rode to Dowlands & dismounted there'; bottom right, extract of Henry De la Beche's geological map of Lyme Regis, showing Dowlands to the left, 4 miles west of Lyme.

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History of Geology Group @hoggroup.bsky.social · 02/10/2026

In 1812, Mushet drew an impressive section of the strata across the the Forest of Dean coal basin. But his general order of strata had Forest Coals placed above 'Derbyshire Coal' using lithology & not fossils to correlate the strata in a reasoned but flawed mistake. See doi.org/10.17704/194....

Image of Mushet's 1812 section from Lewis, C. 2016. Earth Sciences History 35 (1): 167–196.

Part of Mushet's order of Strata from Lewis, C. 2016. Earth Sciences History 35 (1): 167–196.

Table showing Mushet's flawed order of strata - from Lewis, C. 2016. Earth Sciences History 35 (1): 167–196.

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History of Geology Group @hoggroup.bsky.social · 26/09/2026

HOGG field meeting to the South Alpine part of Scotland by Hutton and Clerk of Eldin in 1786, at Southwick coast. Hutton and Clerk of Eldin continued their exploration of this coast heading east towards their destination at Arbigland House. 5/5

Following the road above the coast eastwards towards Criffel Mountain , Hutton and Clerk of Eldin descended a "ravine" to examine the rocks and found the further proof of what they had discovered at Sandyhills bay. Clerk of Eldin made this drawing - although there are no field sketches and this seems to be a 'fair copy' drawing - so it may have been drawn from memory. The spot can be located by the stack in the background along the coast it is 'The Needle's Eye'. The HOGG field party descended the same path that can be seen in the drawing. Clerk of Eldin drew veins of granite penetrating schistus - and these can be seen in the next photo.

This is the Needle's Eye, shown in Clerk of Eldin's drawing. This locality has not previously been identified as visited by Hutton and Clerk of Eldin. There is much more foliage covering the site than shown in Clerk of Eldin's drawing but them veins of (pink) granite can be seen on the right hand side of the arch. This location appears to have been an important spot for Hutton in showing threads of granite 'invading' the schistus.

Arbigland House, built in 1755 was the residence of William Craik, a friend of Clerk of Eldin's brother, where they stayed arriving 24th September and departing on 27th 1786. They were delayed for a full day due to rain.

Image source: Craik, W. (c. 1755). Architectural drawing of a large stone manor house [Illustration]. Kirkbean Parish Heritage Society. www.kirkbean.net/arbigland-estate. The original drawing is in The Arbigland Estate Papers, Blackett Family Collection. Arbigland Estate Office, Kirkbean.

The HOGG field party enjoying a splendid tea at Arbigland House in the room where Hutton and Clerk of Eldin would have dined. Quite an experience at the end of the day - after examining th erock on the shore as did Hutton and Clerk of Eldin - we found the same fossils they encountered.

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History of Geology Group @hoggroup.bsky.social · 26/09/2026

HOGG field meeting to the South Alpine part of Scotland by Hutton and Clerk of Eldin in 1786, at Sandyhills Bay. This was another important location for Hutton on this journey, where he found an illustration of the proof for his theory that he was seeking. 4/5

Sandyhills Bay - rocks at the eastern end - the wave-cut platform and overturned beds of 'schistus' (greywacke) help to locate the spot where Hutton and Clerk of Eldin declared they found another junction with granite (the Criffel granite) with veins of granite penetrating into the schistus. Or is this the spot? That's what the HOGG field party were attempting to reconcile. Some features match perfectly but others are rather vague and seem to be more dispersed in the field than as shown in Clerk of Eldin's drawing.

Hutton and Clerk of Eldin visited this locality on 24th September 1786. This drawing was completed later as a 'fair copy' drawing - seemingly a composite from a series of original sketches in his journal notebook. Comparew with the previous photo.

The field party examining a granite intrusion into the 'schistus' (seen at the foot of the cliff. The stratified schistus above appears to have been folded. This is a good spot to examine both granite and schistus - easily observed in the boulders on the beach.

Hutton described himself and Clerk of Eldin as "breaking through the bushes and briars" where they "found the granite, not only involving the terminations of the broken and elevated strata , but also interjected among the strata...."
Just to the rear of the shoreline , at a relict (and overgrown) coastal cliff , the HOGG field party found examples of the evidence Hutton sought - broken fragments of schistus enveloped within granite.

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History of Geology Group @hoggroup.bsky.social · 26/09/2026

HOGG field meeting to the South Alpine part of Scotland by Hutton and Clerk of Eldin in 1786, at Tongland Bridge. 3/5

Looking over the old bridge built for the military road in 1761. On 21st September 1786 Hutton and Clerk of Eldin observed three porphyry dykes from here which Clerk of Eldin recorded by drawing a plan map. The HOGG field party compared the drawing to what can be observed today. Despite major changes due to a hydro-electric scheme the three dykes can still be observed - see next photo.

Looking over Tongland bridge the three dykes can be seen stretching across the river - the vertically inclined 'schistus' (greywacke) in the foreground was drawn on Clerk of Eldin's plan, which included accurate width measurements of dykes and gaps between. The plan is a masterly example of topographic mapping of its time.

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History of Geology Group @hoggroup.bsky.social · 26/09/2026

HOGG field meeting to the South Alpine part of Scotland by Hutton and Clerk of Eldin in 1786 at Cairnsmuir mountain. A HOGG information board is now displayed Cairnsmore of Fleet National Nature Reserve Visitor centre for visitors to learn why this is an important spot for the history of geology.2/5

The field party at the locality where Hutton and Clerk of Eldin considered they had found proof for Hutton's idea of granite being fluid. An important spot - as for Hutton this was a different example of what he had claimed to see at Glen Tilt a year earlier and vindication of his theory. However, it was not easy for much of the face was covered in moss; thus later he wrote: "It was not without much pains and labour that we thus proceeded to investigate what could not appear at the first sight ..."

This is the engraving of the drawing that Clerk of Eldin made of the locality at the Clints of Dromore on the edge of Cairnsmore mountain. The locality is now within the Cairnsmore National Nature Reserve looked after by NatureScot.

Included fragments of 'schistus' that convinced Hutton that here was another proof demonstrating the fluidity of granite and that it was not the original 'primitive' rock postulated by the Neptunian theory.

HOGG produced an information board at the Cairnsmore of Fleet National Nature Reserve Visitor Centre (open 24/7) so that visitors can learn about why this is a historic spot for the history of geology and the way we now understand the Earth works.

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History of Geology Group @hoggroup.bsky.social · 26/09/2026

This very week HOGG field meeting followed in the footsteps of James Hutton and John Clerk of Eldin on their 1786 Journey to the South Alpine part of Scotland, exactly 240 years later! We visited localities using original sources to observe and evaluate their "proofs and illustrations". 1/5

Cairnsmuir Burn - as they crossed Hutton and Clerk of Eldin noticed the abundance of rounded granite boulders although the bedrock is 'schistus' (greywacke) - so they conjectured the geological junction would be found up in the mountains above.

The HOGG field party viewing the 'schistus' and granite boulders in Cairnsmuir Burn

In consequence of their discovery of granite boulders in Cairnsmore Burn Hutton and Clerk of Eldin decided to hire horses and a guide in Creetown to take them up to find the schistus - granite junction along the foot of Cairnsmore mountain.
The following day ( 21st September 1786) Clerk of Eldin drew this image of Creetown, with the mountain in the background. The HOGG field party found the location where Clerk of Edlin sketched this view - then, as Hutton and Clerk of Eldin did back in 1786 , we proceeded to the foot of mountain.

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History of Geology @historyofgeology.bsky.social · 25/09/2026

September 25, 1749, birthday of German mineralogist Abraham Gottlob Werner ...

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British Geological Survey @bgs.ac.uk · 26/09/2026

The BGS maps portal provides access to over 45,000 high-res viewing images of almost all maps produced by BGS since mapping started in 1832. This sheet is from 1852. It shows North part of Anglesey, and part of Holyhead Island Mineral Lodes. Access the portal: www.bgs.ac.uk/information-...

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Greg Priest @gregpriest.bsky.social · 26/09/2026

L: Color print magazine advertisement for Pennsalt DDT products. This ad appeared in Time Magazine, June 30, 1947. Science History Institute. R: Photo of children being spayed with DDT in a public swimming pool. Date and photographer unknown. 🌱🐋 # HistSTM 🧪🌎 #philsci #philsky #WomeninSTEM

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Dr Susan Newell @sue-newell.bsky.social · 21/09/2026

@hoggroup James Hutton Tercentenary field meeting to Dumfries & Galloway. Day1 Clints of Dromore 😍

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Greg Priest @gregpriest.bsky.social · 09/09/2026

OTD in 1854, Charles Darwin began sorting his notes in preparation for writing a treatise with the working title “Natural Selection.” He would never publish the book, instead publishing a short “abstract”—titled “On the Origin of Species”—in 1859. 🐋🌱 #HistSTM #evolbio 🧪

Manuscript title page of On the Origin of Species, in Charles Darwin’s hand.

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Matt Friedman @friedmanlab.bsky.social · 04/09/2026

The reconstructed skull from Benjamin Waterhouse Hawkins' mount of Hadrosaurus (1868), formerly displayed at the Academy of Natural Sciences of Philadelphia. Photo from my last visit to ANSP in 2021. #FossilFriday

Large plaster skull with a vaguely iguana-like appearance. The jaw is placed separately on a shelf with the rest of the cranium. They are both painted a shade of greenish-gray.

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History of Geology @historyofgeology.bsky.social · 06/09/2026

September 6, 1802, birthday of French naturalist Alicide d'Orbigny, pioneer of the study of microfossils 🦠🔬 paleonerdish.wordpress.com/2015/04/27/a...

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Lapworth Museum of Geology @lapworthmuseum.bsky.social · 03/09/2026

Did you know tiny #fossils once helped solve one of geology's biggest debates? Charles Lapworth used graptolites to establish the Ordovician and end a long-standing dispute. Learn more at the #Museum! Content: Jin Yu. Image: Andy Jones. #LapworthRocks #ThrowbackThursday #geology #geologyrocks

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History of Geology @historyofgeology.bsky.social · 04/09/2026

September 4, 1795, birthday of German mining engineer and geologist Friedrich August von Alberti ...

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History of Geology @historyofgeology.bsky.social · 04/09/2026

Alberti didn't use only the appearance of the rocks to separate this unit from the Permian and Cretaceous, but also fossils. In later publications he described rocks and fossils from the United States and Asia, showing that "the Triassic Formation" can be found worldwide ...

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Tom Sharpe @tomsharperocks.bsky.social · 24/08/2026

Interesting obituary of art historian Peter Cannon-Brookes in today's Times. It was he who spotted the original watercolour of Henry De la Beche's Duria antiquior in the window of a London art dealer in 1980, recognising what it was from the later oil copy he knew @sedgwickmuseum.bsky.social. 1/3

A watercolour painting of a reconstructed prehistoric scene showing ichthyosaurs, plesiosaurs, pterosaurs and other animals all eating one another.

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phlevig @phlevig.bsky.social · 16/08/2026

Il y a tout juste 100 ans, dans le manuel de géologie de Marcelin Boule pour les classes de 4eme A et B, esquisse des continents et des mers pendant l'ère Primaire

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Nigel Monaghan @nigelmonaghan-nh.bsky.social · 16/08/2026

Visit the RDS in Dublin this Heritage Week for an exhibition and talks on the manuscripts of Donald Stewart, the first prospector to document Ireland’s rich mineral deposits. /1 www.heritageweek.ie/event-listin...

heritageweek.ie

'Minerals, Museums, and Mines' - RDS Exhibition and Talk | National Heritage Week 15th – 23rd August 2026

For National Heritage Week 2026, the RDS Library & Archives is hosting the pop-up exhibition 'Minerals, Museums, and Mines: The History of the RDS and Irish Geo...

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Tom Sharpe @tomsharperocks.bsky.social · 15/08/2026

Only just heard about this now, but for anyone interested in the history of geology and Hutton, this looks like an interesting programme, if you’re in or around Perth (the Scottish one, not the one in Australia). @hoggroup.bsky.social

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History of Geology Group @hoggroup.bsky.social · 10/08/2026

HOGG is delighted to see a date set for publication of this book, having know about it for some time, as Gordon Chancellor is a HOGG member. We are in no doubt that it will be a very useful and informative addition to recognising and understanding Darwin's geological work on his Beagle voyage.

This image is from: Stone & Rushton 2024 Charles Darwin's discovery of Devonian fossils in the Falkland Islands, 1833, and its controversial consequences. https://doi.org/10.1144/SP543-2022-190

A specimen collected by Charles Darwin at Port Louis, East Falkland. The brachiopods Australospirifer hawkinsii (labelled b) and Schellwienella sulivani (labelled c and named after Lieutenant Bartholomew Sulivan of HMS Beagle) are associated with a scattering of crinoid columnals (B17794). The Falkland Islands 2 pence coin is 25 mm in diameter.
Source: © Trustees of the Natural History Museum, London, reproduced under the terms of a Creative Commons Attribution Licence (CC-BY 4.0).

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Tom Sharpe @tomsharperocks.bsky.social · 10/08/2026

Delighted to say that The Fossil Woman A Life of Mary Anning has been reprinted and is available once again. It can be ordered through your local bookshop, or uk.bookshop.org/p/books/the-... If you’re lucky enough to visit Lyme Regis you’ll find it at the Lyme Regis Bookshop and Lyme Regis Museum.

Book cover in greens and yellows with a fossil skeleton and a silhouette of a woman, and the title The Fossil Woman A Life of Mary Anning by Tom Sharpe.

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ppflieger 🇺🇦🇬🇱🇪🇺 @ppflieger.bsky.social · 11/07/2025

It truly is a plesiosaur-eat-pterosaur (& everybody-eat-everybody-else) world, with a worried-loking turtle, in Elements of Geology, by Samuel St. John (1851) #paleoart #fossilfriday #bookhistory

In a large lagoon, a plesiosaur drags a pterosaur from the sky. Behind it, an ichthyosaur eats a large fish, and behind IT, a small plesiosaur swims. Two pterosaurs swoop through the sky. On the bank, two crocodiles confront each other, while a tiny turtle bites into a plant. A larger turgle looks on the scene, its mouth gaping in what appears to be astonishment.

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History of Geology Group @hoggroup.bsky.social · 04/08/2026

This 1901 BAAS meeting had a strong programme of geology, & John Horne, President of the Geology Section, gave an excellent summary of progress in Scottish geology. It was at this meeting that the NW Highlands controversy was really laid to rest, a triumph for Nicol, Lapworth & Peach & Horne.

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History of Geology @historyofgeology.bsky.social · 03/08/2026

Here he notes the granite rock forming the summit - an original sample from that day is now hosted in the @TEYLERS Museum, Netherlands. Photo by @HOGGroup ...

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History of Geology Group @hoggroup.bsky.social · 04/08/2026

This 1901 meeting had a strong programme of geology, & John Horne, President of the Geology Section gave an excellent summary of the progress in Scottish geology. It was at this meeting that the NW Highlands controversy was really laid to rest, a triumph for Nicol, Lapworth & Peach & Horne.

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History of Geology Group @hoggroup.bsky.social · 02/08/2026

After retirement from India R.D. Oldham lived in Kew with his sister, spending summers in the south of France, where he studied the geomorphological history of the Rhone delta. His latter years were spent at the Gawlia Hotel, Llandrindod Wells & in France. He died 15 July 1936 in the Welsh spa town.

Map of the Rhone Delta in R.D. Oldham's 1926 paper THE POST-ROMAN HISTORY OF THE RHONE DELTA in: Science Progress in the Twentieth Century (1919-1933), Vol. 20, No. 79 (JANUARY 1926), pp. 487-496

The Gwalia Hotel, Llandrindod Wells, where Richard Dixon Oldham, geologist and seismologist, spent his latter days and he died here on 15 July 1936. The spa and spa gardens are to the left of the hotel.

Recent photo of the Gwalia Hotel, Llandrindod Wells, the last residential home of geologist R.D. Oldham, who died here in July 1936. The spa and spa gardens are just off to the left of the hotel building. The building was occupied by Powys County Council, but they sold it to a developer and (as of 2026) it has not yet been redeveloped. There is no plaque commemorating the important achievement of the former resident.

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History of Geology @historyofgeology.bsky.social · 31/07/2026

July 31, 2023, died on this day aged 87 American geophysicist W. Jason Morgan. In the 1960s he helped to develop the modern theory of plate tectonics ...

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History of Geology Group @hoggroup.bsky.social · 02/08/2026

Very nice if you are not too worried about the book covers fading from overexposure to the sun. Most of our members' reference books are precious, and some very rare, so perhaps we won't recommend doing similar. Btw we take it by 'picturesque' you mean attractive rather than Gilpin's definition?

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History of Geology Group @hoggroup.bsky.social · 30/07/2026

HOGG members visited The Lapworth Museum 29/07/26 when we viewed & discussed a range of historical objects in the archive behind the scenes. The Museum is uniquely valuable in holding artefacts & documents charting the work & life of the geologist it is named after, Charles Lapworth (1842–1920).

Photograph portrait of Charles Lapworth in the Lapworth aAchive of The Lapworth Museum, University of Birmingham (UK).

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History of Geology Group @hoggroup.bsky.social · 30/07/2026

The book 'The Library of Lost Maps' is a fascinating, informative and fabulously illustrated read that will reward anyone who purchases a copy.

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angerj.eurosky.social @angerj.eurosky.social · 23/07/2026

This was fabulous. So interesting. You can watch it on Youtube www.youtube.com/live/RIbdjhI...

youtube.com

Public Lecture - Mineral and Earth Pigments in Art and Architecture

YouTube video by The Geological Society

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Tom Sharpe @tomsharperocks.bsky.social · 14/07/2026

While attention at Sotheby's in New York today was focused on the sale of a dinosaur, someone picked up Henry De la Beche's wonderful 1830 anti-Lyellian lithograph, Awful Changes, with Professor Ichthyosaurus lecturing to a class of fellow saurians for just $5,000 hammer, so about £4,800 with fees.

A mounted skeleton of Tyrannosaurus rex.

An 1830 lithograph of an ichthyosaurian professor lecturing to a class of other ichthyosaurs and plesiosaurs on the inadequacies of the human skull.

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NHM Library and Archives @nhmlibraryarchives.bsky.social · 15/07/2026

Out now! The Summer 2026 issue of the Museum's Magazine, free to Museum members & subscribers of Apple News+ & Readly. Featuring articles on the creation of the #NaturalHistoryMuseum, by Karolyn Shindler, & tales of the Abominable snowman from the #Archives, by Assistant Archivist, Rebecca Keddie.

Man in 19th-century formal attire—black suit with a red academic gown—stands with one hand on his hip and the other resting on a large fossilized thigh bone displayed on a draped table.

Coiled bright green pit viper with textured scales and a vertical pupil against a black background, overlaid by large white headline Beauty balance bite and small Natural History Museum branding promoting a Summer 2026 feature about snakes.

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History of Geology Group @hoggroup.bsky.social · 13/07/2026

John Phillips marked this landslip on the 5th edition of his 'New Index Geological Map of the British Isles', published in 1840, such was its fame amongst geologists & public alike, & it continued to be marked on Phillips' maps up to the 11th edition in 1862.

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History of Geology Group @hoggroup.bsky.social · 13/07/2026

John Phillips marked this landslip on the 5th edition of his 'New Index Geological Map of the British Isles', published in 1840, such was its fame amongs geologists and public alike, and it continued to be marked on Phillips' maps up to the 11th edition in 1862.

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Tom Sharpe @tomsharperocks.bsky.social · 12/07/2026

A curious feature of Mary Anning's sparse notes on her 1829 visit to Charlotte Murchison in London is that part way through a sentence describing what they did on Saturday 11th July, Mary's writing gives way to that of Charlotte who goes on to describe their visit to church on Sunday 12th.

Left, portrait of Mary Anning wearing a green cloak and a straw bonnet, with a basket over her arm and holding a hammer; right, extract from Mary Anning's notes on her 1829 visit to London, part written by Mary, the remainder by Charlotte Murchison.

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History of Geology Group @hoggroup.bsky.social · 12/07/2026

This note mentions visit to Baker Street Bazar with a diorama/ panorama (scenery?) of Rome for 'Bohemian Brothers Mtng' - presumably the musical quartet? & Mr Sowerby's Museum in Lambeth, which featured the famous Wold Cottage Meteorite that landed 1795. Quite a cultural Saturday in London.

Portrait of James Sowerby,Snr by Thomas Heaphy, 1816, probably in the Museum house in Lambeth that Mary Anning visited with Charlotte Murchison in July 1829. The Wold Cottage meteorite is on the table at right. (Image from royalsocietypublishing.org)

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Tom Sharpe @tomsharperocks.bsky.social · 03/07/2026

3 July 1824: a meeting of two icons of early 19th century geology, Mary Anning and Charles Lyell who called at her shop in Lyme Regis. He saw a large ichthyosaur which she had found 2 weeks earlier and was preparing, 'her cleaning the specimen a great instance of skill & knowledge of Osteology'.

Top left, portrait of Mary Anning in a green cloak and straw bonnet; top centre, Anning's house where she met Lyell, a 3 storey house with ground floor bow windows and a central door with stairs leading to it, and a basement; top right, portrait of Charles Lyell, a young man, balding, with long sideburns; bottom, extract from Lyell's journal: '3d July Saty. Lyme. Called on Mary Anning. Large Ichthyosaurus Tenuirostris ? found a fortnight ago. Ten feet long. M. Prevost sketched it '

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History of Geology Group @hoggroup.bsky.social · 28/06/2026

Apologies for the typo - it should, of course, have read "Glencoe" And the link should be: zenodo.org/records/2346...

zenodo.org

The Cauldron-Subsidence of Glen Coe, and the Associated Igneous Phenomena

n/a

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History of Geology Group @hoggroup.bsky.social · 28/06/2026

And we hope you paid homage to EB Bailey, C.T.Clough & H.B. Maufe who, 120 years ago, mapped the Gelocoe geology & recognised as a downfaulted block within an oval ring fault representing a collapsed caldera - the first detailed analysis of an eroded subaerial caldera. zenodo.org/records/2346...

E. B. Bailey ca/ 1910.
Image ©BGS (NERC) GeoScenic Assetbank ID 33766

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Alisa Bokulich @alisabokulich.bsky.social · 27/06/2026

So disappointed that our tour to Staffa/Fingal's Cave was canceled today 😭 but still enjoyed wandering around Glencoe. ⚒️🏴󠁧󠁢󠁳󠁣󠁴󠁿

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History of Geology Group @hoggroup.bsky.social · 27/06/2026

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