Category Archives: From the Experts

Charles Lyell’s Books

‘No. 1 Mem for Tours’ features ‘Author’s (CL’s) Copies of Papers’.

In his Scientific Notebook 1, dated March – April 1825, Charles Lyell lists things to take on his first geological tour, designed to gather the evidence for his first book. In the list, he notes ‘Author’s (C.Ls) copies of papers‘, and it’s delightful to see him describe himself in that role.

 

 

Felicity with Jeremy Upton, Director of Library & University Collections at Lyell exhibition opening.

Felicity MacKenzie came across Charles Lyell whilst completing her History degree at Bristol – and for a considerable part of that, consulted online versions of his books during lockdown conditions. Felicity has now completed her Masters degree at Cambridge, where again, she was able to focus on Lyell. She is currently applying for a PhD in order to be able to explore his life further. Here, she gives a thorough introduction to Lyell’s books, as well as current links to online versions. 

 

The books that Charles Lyell wrote played an important role in the way in which he honed and communicated his geological work. When considered alongside each other, they offer the opportunity to trace the threads that run across Lyell’s thought and practice, as well as to compare and contrast his interests and concerns at different times in his career.

A selection of different editions of Lyell’s Principles, held at the University Library.

Lyell’s first and most famous book was the Principles of Geology: Being an Attempt to Explain the Former Changes of the Earth’s Surface, by Reference to Causes Now in Operation. Initially published in three volumes – volume I 1830, volume II 1832 and Volume III 1833, the Principles was reprinted in twelve editions over Lyell’s lifetime and sold over twenty-five thousand copies. As the name suggests, Lyell used the book to consolidate and promote the ‘principles’ by which he believed modern geological science should be conducted. The most central of these principles was Lyell’s insistence on the exclusive explanatory authority of the reliable, rationally trained human observer.

For Lyell, human witness and reason formed the only basis for truth. This led him to state his
famous case – that ‘the present is the key to the past’ based on the idea that the action of
geological causes in the present, fell within the remit of human observation, and so formed the only trustworthy basis for knowledge about the way in which such forces might have acted in the past.

Principles, 10th Edition, volume 2, 1868.

This kind of human reason-centred geology had particular political ramifications in the 1830s, when ideas about reason versus revelation – and the bearing of the Bible upon truth – had significant implications for the politics of church, state and education. Lyell was aware that his work could produce heated debate and touch realms beyond geology. As a result, he structured his rhetoric in the Principles carefully. In so doing, he produced a masterpiece in the tactful presentation of controversial ideas. The Principles burst onto the British intellectual scene and remained an important cultural work throughout the nineteenth century and beyond.

 

 

Lyell’s second book was the Elements of Geology (1838). This was published in seven editions
between 1838 and 1871; its name changing to the Manual of Elementary Geology with the third
edition. This book was a practical, ‘how-to’ supplement to much of the material already covered
in the Principles, and taught the practitioner what they needed to know for application in the
field.

Next, came Lyell’s American travelogues. Lyell was invited to give a series of lectures at the Lowell Institute in Boston in 1841. During this visit, Lyell not only lectured in Boston, Philadelphia and New York, but travelled extensively around the northern and southern states with his wife Mary, observing and collecting geological phenomena. On returning home, Lyell decided to write up his geological work alongside social and political commentary. This resulted in the Travels in America: With Geological Observations on the United States, Canada, and Nova Scotia volume I and volume II in 1845.

Both volumes include terrific foldouts, necessary to accommodate the scale of the country and its geological features.

Illustrations were important to Lyell, and in his Travels he included a fantastic fold-out, necessary to accommodate the scale of Niagara

That same year, Lyell was invited to lecture again at the Lowell Institute, and factored in another nine-month stint of travelling. The results were published in his A Second Visit to the United States of North America volume I and volume II, in 1849. Once again, a significant portion of this work was dedicated to social and political commentary, which makes it an important insight into Lyell’s broader ideology. In particular, it sheds light on Lyell’s very problematic attitude to race and enslavement

Lyell’s final book was the Geological Evidences of the Antiquity of Man, with remarks on theories of The Origin of Species by Variation (1863). This work focussed on the question of human antiquity and is famous for how many people Lyell upset with it. Charles Darwin was frustrated that Lyell did not take the opportunity – as a significant figure in the highest echelons of British science – to offer full support for an evolutionary account of human origins. Additionally, Lyell infuriated colleagues, such as Robert Owen, Hugh Falconer and John Lubbock, who accused him of plagiarising their own and others’ works.

 

Each of Lyell’s books had a different and important impact on the intellectual and cultural life of nineteenth-century Britain. Hugely successful, they chart a course over what was an amazing timeframe in both scientific findings and their popularisation.

Thank you Felicity for sharing your knowledge on Lyell’s books with us! Copies of Lyell’s books from the University’s collections, as well as Lyell’s own annotated copies, are featured in our current exhibition. We will be featuring Felicity’s comprehensive online book list, and more, in our forthcoming website.

Recommended further reading:

  • James A. Secord, ‘Introduction’, in Principles of Geology (London; New York: Penguin Books, 1997)
  • Martin J.S. Rudwick, Worlds before Adam: the reconstruction of geohistory in the age of reform, (Chicago: University of Chicago Press, 2008)
  • Martin J.S. Rudwick, ‘The Strategy of Lyell’s Principles of Geology’, ISIS, 61:1 (1970), 4-33
  • Roy Porter, ‘‘Charles Lyell and the Principles of the History of Geology’, The British Journal for the History of Science, 9:2 (1975), 91-103
  • Stuart A. Baldwin, ’Charles Lyell: A Brief Bibliography’, (Essex: Baldwin’s Scientific Books, 2013)
  • Robert H. Dott, Jr., ’Lyell in America: his lectures, field work and mutual influences 1841-1853’ Earth Sciences History, 15 (1996), 101-140
  • W. F. Bynum, Charles Lyell’s ‘Antiquity of Man’ and Its Critics, Journal of the History of Biology, Summer, 1984, Vol. 17, No. 2 (Summer, 1984), pp. 153-187

 

“An epoch in history” – Charles Lyell in Nova Scotia 1842

Guest Blog Author Tim Fedak

We are delighted to welcome Tim Fedak – a Curator and Palaeontologist based at Nova Scotia Museum – to our blog! Tim has been waiting ever so patiently for access to Charles Lyell’s Notebook number 104, documenting his visit to Nova Scotia in 1842 to view the geology and fossil trees at Joggins, and which ushered in a new era of geology….

 

 

 

 

Today, Nova Scotia is well known among geologists around the world for its important geology.  The Joggins Fossil Cliffs UNESCO World Heritage Site has a world class interpretive centre and regular tours of the famous fossil forests. The importance of that site, as well as the Cliffs of Fundy UNESCO Global Geopark on the northern shore of the Minas Basin, both find their beginning in 1842.

Joggins Fossil Cliffs, a UNESCO World Heritage Site on the shores of the Bay of Fundy, Nova Scotia.

 

In July and August of 1842, Charles Lyell was visiting Nova Scotia for a month of geology, to engage the local geologists and to examine the fossil forest that everyone, including Darwin would come to hear about.  The interactions he had and the insights he gained from walking along the shores of the Bay of Fundy shaped his observations and convictions about ancient trackways and life in the Coal Age.

Cliffs of South Joggins, Figure 18 from Charles Lyell’s Travels in North America, Vol 2. 1845.

Sir. William Dawson was born and raised in Pictou, Nova Scotia but he had studied at the University of Edinburgh in 1840-41. He was still just a young man passionate about geology and fossils when Lyell visited the province, and they shared insights and views of geology. When Dawson published his iconic Acadian Geology in 1855, he noted in the introduction:

The year 1842 forms an epoch in the history of geology in Nova Scotia. In that year Sir Charles Lyell visited the province, and carefully examined some of the more difficult features of its geological structure, which had baffled or misled previous inquirers.“  p6.

Dr. Ebenezer Fitch Harding, a community physician in Windsor, Nova Scotia, was another local geologist that Lyell interacted with, accompanying him to the geology sites and mud flats of the Minas Basin, Bay of Fundy in the summer of 1842.

See more on this important period in Nova Scotia geology, including the links between Nova Scotia and Edinburgh, and Harding’s contributions to science in Tim’s article https://www.erudit.org/en/journals/scientia/2021-v43-n1-scientia05889/1078926ar/ 

Lyell’s trip to Nova Scotia is well described in Volume 2 of his ‘Travels to North America’ published in1845. However, when I first heard that the University of Edinburgh was attempting to purchase Lyell’s 294 Notebooks for archival research, I was immediately thrilled with the thought of what more he might have written during his visit to Nova Scotia. I then celebrated when the project was successful and have been waiting (somewhat) patiently since then.

In early September this year, I learned that Notebook 104 had been scanned and was now available online. I dropped everything and began to carefully make my initial examination of the notes and drawings of the scanned pages.  You can see my short presentation of some of the immediately interesting observations made about Notebook 104 at:

https://youtu.be/A1OxD0Hpqog

Joggins Sketch

The Joggins cliff sketch on page 48 was immediately of great interest and value. This illustration became the key that unlocked the understanding that the gypsum and limestone layers (now known as the Windsor Group) – were below the coal.

Detail of two preliminary sketches of the Joggins Cliffs in Lyell Notebook 104, p. 48.

Shubenacadie River

The notebook includes many important sketches of the work carried out along the Shubenacadie River, which included contributions from J.W. Dawson, William Duncan, Richard Brown and others.

Field Work, Travel Notes

I am interested in the people of geology and what it was like for them to carry out the work and attain their insights. I was particularly struck by the notes of the bags that Charles and Mary Lyell travelled with, and the supplies that they required. A very personal view into the travelling aspect of field work.

Mary Lyell

Mary Lyell being on this month-long visit to Nova Scotia is also incredibly interesting. It remains difficult to locate any records that describe her activities when they were apart. However, there are notes in Charles’ notebook, as well as in letters he wrote to Dawson that Mary was actively engaged in discussions of geology and conchology.

Extract from Letter from Charles Lyell, to William Dawson, Pictou, Nova Scotia, quoting “…Mrs. Lyell says…”

 

I am truly grateful for the opportunity that the University of Edinburgh and the project partners are providing in making these notebooks available for research. Here in Nova Scotia, this is a special way to celebrate 180 years since Charles and Mary Lyell where here exploring the geology and natural history of Nova Scotia.

I’ve mapped the Lyell’s travels in Nova Scotia using the information in Notebook 104, descriptions from Lyell’s Travels in North America, and links through to archived letters on this interactive timeline. Follow the hashtag #NS1842 and find additional information in this Tweet Collection #NS1842

Thanks Tim – it’s great to hear more about Lyell’s impact in Nova Scotia. We love your enthusiasm (and patience!).

 

Considering labels

The Cockburn Geological Museum at the Grant Institute holds an extensive collection of over 130,000 geological specimens that reflect the whole spectrum of earth science materials, including minerals, rocks and fossils. Most of these specimens have labels – some have multiple labels, some of these labels are loose paper in the bottom of specimen boxes, while others are glued directly on to the rock or mineral. Some information is written on with red or blue paint. Some specimens have all of the above – some don’t have any labels at all.

There are several specimens at the Cockburn that are clearly marked ‘Sir C Lyell’ – in what looks to be his own handwriting – a good indication that they were originally part of his own collection.

Now that the University of Edinburgh has acquired Lyell’s 294 Notebooks, for the first time, in a long time, both the specimens and the documentary records, can be brought together to share the same space. The notebooks offer the chance to enrich our knowledge of the specimens, adding valuable context and insight into when and where they were collected, and what they were potentially used for.

Gillian McKay, Curator of the University of Edinburgh's Cockburn Museum

 

 

 

 

 

Using our now well-developed Lyell ‘next level’ palaeography skills, we feel ready to explore the links between specimens and the written information – but to get us started, we brought in the label expert!

Kate Bowell studies the Cockburn Museum's Lyell specimens.

 

Postgraduate researcher Kate Bowell is exploring the stories the National Museum of Scotland has told in their collection of 20,000 exhibition labels and how these stories have changed over time (See Kate’s blog here https://blog.nms.ac.uk/2021/12/14/a-history-of-exhibition-labels-and-the-stories-they-tell/ ). Her experience in studying the stories behind labels means she is the perfect person to help us start formulating a plan.

 

 

 

 

We were also pleased to have undergraduate student Will Adams join us. Currently in 4th year Archaeology at the University of Edinburgh, Will’s interested in archives and how they relate to archaeological collections – he is also on the quest to find a dissertation topic.

 

 

 

 

 

 

Could we join forces to help each other out? What followed was a joyous 3 hour discussion – exploring the history of labels, the history of collections, why people collect, how people use labels, personal collection administration, split and movement of collections, the rise and purpose of museums – and how museums subsequently label items, both for use and for public enjoyment.

Lyell’s administration throughout his collection – his page numbering, indexing and the labelling of his specimens – show that he actively used them as a resource for his work. No actual catalogue exists – and so we have to start slowly working out how he kept his collection in order, and how he used specimens to aid his understanding. Now that the collections are together, it should be possible to start to see how it all linked up – and there is huge potential to learn much more about the specimens.

For example, one of the Cockburn’s specimens, and part of Lyell’s original collection is this amazing Agate, labelled in Lyell’s own handwriting:

We recognise Lyell’s distinctive ‘e’ – and the place name Mount Horne points us to British Columbia[1]. The specimen’s original owner is noted by Lyell as the Honourable C.A. Murray. In many ways similar to Lyell, Charles Augustus Murray was an author and diplomat,. He attended Oxford University, and spent several years travelling across Europe and America from 1835 and 1838, describing his experiences in popular books on his return [2].

We know Lyell visited British Columbia several times; the collection includes both Charles and Mary’s certificates recording their passing behind Niagara Falls to Termination Rock dated the 7th June 1842; and a card representing Columbia College dated 1853. As we are able to identify critical information – names of people, places, mineral types – on the labels – these can be cross-referenced to text in the notebooks, allowing us to focus in on the history of the specimens. Creating this framework of knowledge allows us to develop our hypothesis about how travel, collaboration, and collecting (or trading) specimens fed into the larger ideas of the time relating to “how the earth systems worked”.

CA Murray's specimen relating to Mount Horne, part of the Lyell Collection at the Cockburn Museum

Will’s presence also helped us see how he can add archaeological detail to the specimens. Lyell’s interests where wide ranging, and his exploration of the history of man resulted in him collecting neolithic objects ranging from tools to beads. Of course, we cannot be experts in everything, and with the collection of specimens being held by the Grant Institute, they have been categorised very much as geological specimens. Will’s contribution proved how collaboration with people who can view the objects with an “archaeological eye” adds significant detail to the objects. Our meeting provided him with the perfect opportunity to dive in and begin to think about a project combining his interest in archives and collections. Inspired, Will has booked into the CRC Reading Room to start looking at the collection in more detail, and is talking to his dissertation advisor to firm up a plan.

The benefits in bringing both the collections and experts together are tangible. Collaborative work will really enhance the Lyell collection – indeed, our afternoon spent considering label gave us a practical insight into how he himself worked and used the collection.

[1] https://www.mindat.org/feature-6081205.html

[2] Charles Murray (author and diplomat) – Wikipedia

An update from Project Conservator, Claire

My name is Claire Hutchison and I am very proud to introduce myself as the Lyell Project Conservator at the University of Edinburgh’s Centre for Research Collections. I am a Paper Conservator who has worked extensively across archives in Edinburgh on a number of archival projects. My work has led me to become a specialist in fragile formats, such as transparent papers, newspapers and wet press books. This is not my first time working at the CRC; I was lucky enough to be an intern in the conservation studio twice in my career.

I have learnt a lot about Lyell and his dedication to recording his findings since starting. It’s a very personal collection, and it’s clear that they were cherished by Lyell. The labels and indexes are beautifully written and constructed; one can only dream of having the same patience and dedication with their own notebooks. As a Conservator, I was also impressed to find examples where Lyell had hand sewn his index pages into the notebooks. It’s a wonderfully consistent collection which has been a pleasure to conserve. It’s also been made clear to me since starting just how sought after this notebooks are as requests have been flying in; researchers are keen to start connecting those dots across the collection.

Conserving the Notebooks prior to digitisation was imperative in order to prevent loss or further damage to the bindings. The 294 Notebooks were in varying levels of condition, however, overall they were stable with very few requiring intense treatment. It was clear from the flexibility of the spines that they had been well used and heavily manipulated by Lyell on his travels. The adhesive Lyell used to apply his labels and covering material was starting to fail. The earlier Notebooks suffer from red rot – commonly found in vegetable-tanned leathers from the late nineteenth and early twentieth centuries. The leather will become dusty, and the fibrous structure will deteriorate, resulting in the damage or complete loss of the leather binding.

Reattachment of covering material before and after

Internally, it was clear that Lyell had held and bent the spines to write into positions that had caused splits to form between the signatures of the text block. If not treated, these will worsen with handling and ultimately lead to loose pages or whole sections of the text block detaching fully from the binding. Lyell used either graphite or ink within his notebooks, so gelatine has been used to ensure that no bleeding or movement of the corrosive iron in the ink occurred. A strip of Japanese paper was applied to repair this inner joint and prevent further splitting (see example below).

Setup and attachment of inner joint repairs

In some rare instances, further intervention was needed where parts of the spine were lost and the sewing was exposed. This required lifting back the leather of the boards either side of the spine and inserting a repair to stabilise the structure. Layers of Japanese paper were applied to the spine and built up to the required thickness of the leather. Then a final layer of toned Japanese paper was applied to the top, blending in with the rest of the spine piece.

Spine repairs before, during and after treatment

Thanks to generous funding from the National Manuscripts Conservation Trust, two 8-week interns have started working on the Lyell Project. They are helping to assist in the overall efforts of the project, but also have been given their own branch of the collection to work on. Sarah MacLean is currently working on the 1927 donation of letters of correspondence. Joanne Fulton has been given the task of rehousing Lyell’s collection of Geological specimens. This month, my work on the project will continue with the conservation and rehousing of the printed material in the collection, such as Lyell’s own copy of the ‘Proceedings of the Geological Society’.

Stay tuned for more conservation updates soon!

 

Project Re-boot!

The last few years has seen us all face challenges and embrace change – and the Charles Lyell Project is no different. The Project has said farewell to Elaine and Elise – and we thank them both so much for all their efforts and wish them well. We also need to thank existing University of Edinburgh, CRC and Digital Library staff for keeping the aims and objectives of the project alive – and we can report that there’s been significant progress on recruitment, funding, digitisation, and in conservation.

So – more blogs are GO!

Starting with conservation, we are delighted to signpost you to two brilliant blogs, detailing the work of the fantastic Interns who have been working on the Lyell papers and specimens.

Supported by Project Conservator Claire (her blog forthcoming) the Intern’s light but expert touch has greatly enhanced the health and well-being of the collection. Find out more here:

Righting Letters – Conserving the Lyell Collection | To Protect and (Con)serve (ed.ac.uk)

and

Homes for Rocks – Rehousing the Lyell Geological Specimen Collection | To Protect and (Con)serve (ed.ac.uk)

Reverse of an envelope addressed to Charles Lyell, part of the Acceptance in Lieu deposit. Photograph taken by Sarah McLean.

In Lyell’s Own Words

This month we hear from Lyell Project Archivist Elise Ramsay and Project Volunteer Erin McRae. Elise and Erin each reflect on their recent progress transcribing the Sir Charles Lyell notebooks using ground-breaking AI and machine learning, and their work together to develop this incredible AI tool for further use with the Lyell collections. 

Elise Ramsay, Project Archivist, holding an open scientific notebook and smiling

Elise Ramsay
Lyell Project Archivist

For me, the written word is the most captivating and characterful element of the Sir Charles Lyell collections. When reading Lyell’s own words on the page in graphite and ink, I can tell when he is writing from a desk, or in the field. In decoding his idiosyncrasies, I have come to understand a bit of the man himself. Understanding Lyell’s handwriting is the key to opening up this internationally significant collection. But it is also the first barrier. Lyell’s handwriting is of his time; often liberally abbreviated, topic specific, and faded. Complete transcription of the collection is paramount to accessibility, and recently, we have made some exciting progress towards this goal.

In early March 2021, the Charles Lyell Project team took part in hosting the EDITOR Transcription virtual workshop. In preparation for the workshop, two digitised notebooks from the Lyell collections (MSVII and Notebook No 4) were selected to be trialled with the Transkribus platform. Over 8 weeks, EDITOR project interns Evie Salter and Nicky Monroe transcribed these notebooks word for word. With this data, an algorithmic model of Lyell’s handwriting was created, effectively teaching Transkribus to recognise Lyell’s words on the page, and to decipher them automatically. This innovative work by the EDITOR Team, has revolutionised our systems and methods of cataloguing. Already we can see this balance of machine learning and human input has introduced new efficiency (and enjoyment!) to the task of transcription.

To build on this momentum, we were delighted to offer a remote volunteer opportunity aimed at trialling the newly created Transkribus model and testing the many features Transkribus offers. In this capacity, Erin McRae joined us in March, contributing to key cataloguing efforts and scoping the features of Transkribus for further use with the collections. Erin is a recent graduate from the MSc in History programme at the University of Edinburgh and holds an MA in Archives and Records Management from University College Dublin in Ireland. In only two months, Erin has produced tremendous material, and we are indebted to her. Here, Erin reflects on her first impressions of the Sir Charles Lyell collections and using Transkribus:

Profile Picture, Erin McRae, Volunteer

Erin MacRae
Lyell Project Volunteer

When I think of Sir Charles Lyell, I see a man in constant motion and possessing a thirst for knowledge that knew no boundaries. I can picture him observing the volatile Mount Etna, or immersed in the identification of mollusc species, or exploring geologic formations and petrified fossils millions of years old. I imagine him pausing to scribble down his observations in notebooks in his own inimitable style (a combination of English, French, Italian and Latin), so he wouldn’t miss any detail.

The detail of the collection is of untold value to researchers and presents interesting challenges as we describe the collection. In addressing these challenges, the Transkribus platform is an invaluable tool.  

Transkribus  is “a comprehensive platform for the digitisation, AI-powered text recognition, transcription and searching of historical documents – from any place, any time, and in any language.”1 Using the algorithmic handwriting model developed on the EDITOR project, we were able to upload more raw material from the Lyell collections to the Transkribus platform. In my recent work with Sir Charles Lyell’s notebooks, I found that Transkribus was able to decipher Latin species names with which I was unfamiliar. This saved me a significant amount of time and gave me the ability to transcribe much faster.  An example of this occurred when Transkribus identified “Fissurellagraeca”.2 A species of mollusc, this name has since been replaced by the accepted name “Diodora graeca3 . It is remarkable that it was correctly interpreted by the software in the first place. 

A screenshot of the Transkribus platform. On the left is a digitised image of a page of Charles Lyell's notebook 65. The handwriting is in ink, and an untidy scrawl. On the right is typed words, corresponding to each line in the image. The words are a word for word transcription.

An example of transcription output from the Transkribus platform.
From Sir Charles Lyell Notebook, No. 65
(Ref: Coll-203/A1/65) – (with apologies for the poor quality image).

 

 

 

 

 

 

 

 

 

The transcriptions that Transkribus produces require minor to moderate spellcheck amendments, primarily where vowels are mistaken. There were some instances of errors in phrases, names, and once a whole line of text. In this case I transcribed this line myself which I had done previously with indexes in two other notebooks. These issues are minor and they  do not detract from the immense amount of time I saved  using Transkribus compared to transcribing without the aid of the algorithmic model. In particular, we were all struck by the accuracy of the model in recognising and deciphering antiquated species names. This was invaluable and changes the role of the transcriber.

The overall benefit of the Transkribus software is that it is helping us to develop a much more comprehensive approach to describing and interpreting the Sir Charles Lyell Collections. To a much greater degree than previously possible, we can document and unlock the life and travels of this principal figure in the evolution of the discipline of geology.  

Elise Ramsay, Lyell Project Archivist
Erin McRae, Lyell Project Volunteer 

Sources and further information:
1.
Transkribus.” Read Coop. Accessed April 19, 2021.
2. “Fissurella graeca (Linnaeus, 1758).WORMS: World Register of Marine Species. Accessed April 19, 2021.
3. Ibid.

You can learn more about our revelatory transcription work on the Sir Charles Lyell Collections, part of the EDITOR project, on YouTube:
Editor Transcription Workshop: Day 1/Session 3 – Video 3 of 10 – YouTube
Editor Transcription Workshop: Day 2 /Session 3 – Video 6 of 10 – YouTube 

Professor Richard Fortey on Lyell

  Lyell expert and enthusiast

Professor Richard Fortey is one of the most authoritative and engaging experts on the importance of Charles Lyell. A welcome supporter in the Lyell notebook campaign, he has recently been interviewed by Professor Brian Cox for the joint BBC and Royal Society series People of Science. Watch here for a persuasive account of Lyell’s scientific significance: People of Science

We’d also recommend Richard’s fascinating article on Lyell and deep geological time for the Geological Society (of which he is a past President): Lyell and Deep Time