An acclaimed international collection of earth science articles and book reviews on palaeontology, geology, minerals and more
Jon Trevelyan (UK) Robert Westwood is no stranger to the pages of Deposits. Over the years, I have reviewed several of his geological guides, covering subjects ranging from the Jurassic Coast to Cornwall and the Lake District (ee below). What has always appealed to me about his publications is their … Read More
Jon Trevelyan (UK) Maidstone Museum and an unexpectedly substantial geology gallery Maidstone Museum is not primarily a geological museum. Its collections range across archaeology, natural history, fine and decorative art, costume, ethnography, and local history, with more than 600,000 objects in its care. Yet, tucked away on the first floor … Read More
Jon Trevelyan (UK) This is the eighth in my series of short articles on fossils of the Ordovician. Nemagraptus gracilis is one of the most important and visually distinctive graptolites of the Middle Ordovician, widely known from the black shales of Britain, Scandinavia and North America. Dating to around 463-460 … Read More
Jon Trevelyan (UK) There can be few places in Britain better suited to a geological field guide than the Isle of Wight. Its relatively small area contains an extraordinary range of rocks and fossils, while its eroding cliffs and beaches have produced discoveries ranging from ammonites and molluscs to plants, … Read More
Jon Trevelyan (UK) A geological museum in the heart of the Black Country Dudley is one of those places where geology is difficult to separate from almost everything that followed. The rocks beneath the town and the surrounding Black Country provided coal, ironstone, limestone and fireclay; their exploitation transformed the … Read More
When a Carboniferous swamp drowned, its towering lycopsids collapsed, its peat surface disappeared beneath mud, and the forest that had stood for decades, or at most a few generations, abruptly ceased to exist. Yet within surprisingly little time, new vegetation reclaimed the abandoned lake floor. The first wave of this recovery is written across the roof shales of the West Cumberland Coalfield district in thousands of beautifully preserved fronds, most commonly those of Pecopteris, the characteristic tree ferns of the Westphalian wetlands.
Jon Trevelyan (UK) This is the seventh in my series of short articles on fossils of the Ordovician. Of all the Ordovician gastropods, few are as visually striking as Maclurites bigsbyi. With its large, open-coiled shell and broad, planispiral whorls, the species represents a unique experiment in molluscan shell architecture … Read More
Jon Trevelyan (UK) A museum built on fossils Hastings is usually associated with history rather than prehistory. Its name is inseparable from 1066, while its fishing beach, old town and cliffs are familiar features of the modern resort. Yet the rocks beneath and around the town preserve evidence of a … Read More
Jon Trevelyan (UK) This is the sixth in my series of short articles on fossils of the Ordovician. Trilobites reached their zenith in diversity during the Ordovician, but few species are as impressive as Isotelus maximus. Renowned for producing some of the largest articulated trilobite specimens ever found, this North … Read More
Jon Trevelyan (UK) A museum unlike any other Perched above Scarborough’s South Bay, the Rotunda Museum occupies a unique place in the history of geology (Fig. 1). Opened in 1829, it is one of the world’s earliest purpose-built geological museums and remains one of Britain’s most historically significant centres for … Read More
Stephen K. Donovan (UK) One of the first volumes that I bought when I first took up palaeontology over 50 years ago was the very excellent Directory of British Fossiliferous Localities (Arkell et al., 1954; Donovan, 2025a), a tome full of meat. It was published in the same year as … Read More
Jon Trevelyan (UK) This is the fifth in my series of short articles on fossils of the Ordovician. If one fossil trilobite has achieved near-universal recognition among collectors, it is Flexicalymene meeki. Abundant, beautifully articulated and famous for its perfectly enrolled specimens, this species offers a remarkably complete view of … Read More
This is the first of a three-part series exploring Britain’s lost lakes – landscapes that once existed across very different timescales, from the Devonian world of the Orcadian Basin to the fleeting ice-dammed lakes of the last Ice Age. In this opening article, we go deep into the Devonian, reconstructing the Orcadian lakes from the evidence preserved in Caithness and Orkney. Here, finely layered sediments, exceptional fossil preservation and subtle environmental clues allow us to rebuild not just the organisms that lived there, but the structure and behaviour of the lakes themselves.
Jon Trevelyan (UK) This is the fourth in my series of short articles on fossils of the Ordovician. Among the diverse and often bizarre echinoderms that flourished during this period, Echinosphaerites aurantium is one of the most distinctive. A rhombiferan cystoid with a rounded, grapefruit-like body, it embodies the experimental … Read More
Jon Trevelyan (UK) A small museum with a remarkable geological story Tucked away behind the parish church in the centre of Cromer, Cromer Museum occupies a modest site that visitors could easily overlook. Entering through a modern reception building, the museum opens into a narrow courtyard surrounded by a terrace … Read More
Every coal seam in the West Cumberland Coalfield district records the accumulation of peat in a mature lycopsid swamp. But just as revealing as the coal itself is what lies immediately above it – the roof shales. These fine-grained sediments record the moment when the forest drowned, the swamp surface subsided or flooded, and a new ecological phase unfolded above the buried peat. In the West Cumberland Coalfield, roof shales are exceptionally well developed and preserve a full sequence of the events that followed each catastrophic rise in water level.
Jon Trevelyan (UK) This is the third in my series of short articles on fossils of the Ordovician. Although the famous Pterygotus of Silurian and Devonian fame had not yet reached their iconic size in the Ordovician, their ancestors were already present in the marine ecosystems of the period. These … Read More
Jon Trevelyan (UK) Rising above the hills near the town of Blaenavon is the distinctive headgear of Big Pit, one of the most recognisable symbols of the South Wales Coalfield (Fig. 1). Today, the site forms part of the National Coal Museum of Wales, but for nearly a century it … Read More
Jon Trevelyan (UK) This is the second in my series of short articles on fossils of the Ordovician. Among the many colonial organisms that chart the course of Ordovician seas, Didymograptus murchisoni remains one of the most recognisable. A key graptolite of the Middle Ordovician, it combines elegant morphology with … Read More
Jon Trevelyan (UK) This is the first in my series of short articles on fossils of the Ordovician. Among the many graptolites recovered from the classic Dob’s Linn section of the Southern Uplands, Climacograptus wilsoni is one of the most elegant. Its slim, saw-toothed profile captures a phase in graptolite … Read More
Jon Trevelyan (UK) Keswick Museum is not a geology museum in any conventional sense. There are no long stratigraphic runs of specimens, no systematic mineral displays, and no attempt to present geology as a complete discipline. Instead, visitors encounter a typically Victorian mixture of natural history, literature, local industry and … Read More
Jack Shimon (USA) I recently went to the Denver Museum of Nature and Science. This was my first member’s night and I want to go to them every time now.My mom and I went to see Dr Scott Sampson talk about a dinosaur. He is the new chief curator and … Read More
Jon Trevelyan (UK) This is the twentieth and last in my series of short articles on fossils of the Cambrian. Yunnanozoon lividum, from the Early Cambrian Chengjiang biota of southwest China of about 518 million years old, is one of the most intriguing fossils in the long search for the … Read More
Jon Trevelyan (UK) Beneath Dudley Castle lies a landscape that began as a tropical Silurian sea and ended as one of the most intensively worked limestone systems in Britain. Around 425 million years ago, this part of the Midlands lay beneath a warm, shallow sea, building the reef limestone now … Read More
The trunks of Lepidodendron and Sigillaria (Part 2) dominate most people’s mental image of the Carboniferous swamp, but to understand how these forests actually functioned, you need to look beneath the surface, into the layer that supported and anchored the entire ecosystem. In the West Cumberland Coalfield, this means one thing above all – Stigmaria, the distinctive rooting systems of the giant lycopsid trees.
Jon Trevelyan (UK) This is the nineteenth in my series of short articles on fossils of the Cambrian. Wiwaxia corrugata is one of the most distinctive animals of the Middle Cambrian Burgess Shale – a soft-bodied creature decked in shimmering scales and sharp defensive spines, crawling slowly across the seafloor … Read More
Peter Perkins (UK) While an undergraduate, I had the opportunity to be involved in a student exchange with IAESTE (International Association for the Exchange of Students for Technical Experience) during the summer of 1959. Although not specialising in mineralogy, I was assigned to the mine at Stari Trg with three … Read More
Jon Trevelyan (UK) This is the eighteenth in my series of short articles on fossils of the Cambrian. Waptia fieldensis is one of the most beautifully preserved and behaviourally informative animals from the middle Cambrian Burgess Shale. Living around 508 million years ago, it represents an early and unexpectedly sophisticated … Read More
With the restoration of the Crystal Palace prehistoric sculptures and their remarkable Geological Court now virtually complete, it is perhaps worth asking why this unique Victorian landscape continues to command such scientific and historical importance. Why should geologists, palaeontologists and members of the public still make the journey to south London to see reconstructions that are now more than 170 years old and, in many respects, scientifically outdated?
Jon Trevelyan (UK) This is the seventeenth in my series of short articles on fossils of the Cambrian. Vetulicola cuneata is one of the most enigmatic animals from the Early Cambrian, known from the celebrated Chengjiang biota of China. Living around 518 million years ago, it represents a body plan … Read More
