Category: Plate Tectonics

England Fossils Geology Palaeontology Plate Tectonics

The lost rainforest of the West Cumberland Coalfield (Part 6): The seed-fern story – Neuropteris, Odontopteris and Alethopteris

If the lycopsids built the forests and the tree ferns reclaimed the drowned ground, then the seed ferns – particularly Neuropteris, Odontopteris and Alethopteris – tell the story of how the Carboniferous landscape diversified beyond the swamp. These plants, long extinct but abundantly preserved in the roof shales in the West Cumberland Coalfield, flourished on levees, raised mudbanks and floodplain surfaces that were too dry for lycopsids, but too unstable for true forest soils. Their fossils show how the environment shifted from a drowned swamp, back towards a mixed floodplain-wetland mosaic.

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Geology museums of Britain: The Natural History Museum, London (Part 2) – reading the evidence

Jon Trevelyan (UK) From natural history to Earth history In Part 1, we considered a deceptively simple question: what should a great natural-history museum do with a great collection? The Natural History Museum provided no simple answer. In some galleries, magnificent specimens dominate; elsewhere, screens, models, reconstructions and interactive displays … Read More

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Geology museums of Britain: The Natural History Museum, London (Part 1) – what should a great museum show?

Jon Trevelyan (UK) A museum like no other This is the first part of a two-part article on the Natural History Museum in London. And there are few museums whose buildings announce their ambitions quite as emphatically as this museum does. Approaching from Cromwell Road, Alfred Waterhouse’s great Romanesque building … Read More

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Book review: Britain’s Geological Heritage: An illustrated guide to Britain’s spectacular geology and landscape, by Robert Westwood

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

Climate England Fossils Geology Palaeontology Plate Tectonics

The lost rainforest of the West Cumberland Coalfield (Part 5): The ferns return – Pecopteris and the first colonisers of the drowned swamp

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.

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Geology museums of Britain: Cromer Museum, the West Runton Mammoth and the Cromer Forest-bed Formation

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

England Fossils Geology Palaeontology Plate Tectonics

The lost rainforest of the West Cumberland Coalfield (Part 4): After the drowning – the roof-shale succession

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.

Palaeontology Plate Tectonics

The lost rainforest of the West Cumberland Coalfield (Part 3): Beneath the giants – Stigmaria and the swamp floor

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.

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Geology museums of mainland Europe: The Galerie de Paléontologie et d’Anatomie Comparée, Paris

Jon Trevelyan (UK) The Galerie de Paléontologie et d’Anatomie Comparée, part of the Muséum national d’Histoire naturelle, is located in the Jardin des Plantes in Paris. Established in 1898, the gallery showcases an extensive collection of fossils and anatomical specimens, offering insights into the evolution of life on Earth. The … Read More

England Fossils Geology Palaeontology Plate Tectonics

The lost rainforest of the West Cumberland Coalfield (Part 2): A forest of giants – Lepidodendron and Sigillaria

The most visually arresting fossils from the West Cumberland Coalfield, indeed from almost any British Carboniferous site, are the great patterned slabs of lycopsid bark that, if you are lucky, can sometimes be found. Their surfaces carry unmistakable geometric signatures: the diamond-shaped leaf cushions of Lepidodendron or the vertical rows of elongated scars typical of Sigillaria.

England Fossils Geology Palaeontology Plate Tectonics

The lost rainforest of the West Cumberland Coalfield (Part 1): A window into the Carboniferous tropics

The fossils described in this series formed during the Carboniferous Period, around 320 million years ago, when Britain lay close to the Equator. The above figure places the Carboniferous within Britain’s wider geological history. During this interval, extensive tropical wetlands covered much of the country, producing the peat deposits that would later become the coal seams of the West Cumberland Coalfield. This series explores one remarkable record of that vanished landscape.

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A tectonic history of Britain (Part 4): A quiet crust with a long memory – tectonic inheritance in the modern British landscape

Modern Britain lies far from active plate boundaries. It has no active volcanoes and experiences only minor earthquakes, and is often described as tectonically quiet. Yet its landscape is anything but passive. Hills and lowlands, coastlines and drainage patterns all reflect a deep structural inheritance established during earlier phases of continental collision, collapse and rifting.

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A tectonic history of Britain (Part 3): Britain breaks apart – rifting, volcanoes and the birth of the Atlantic

By the end of the Carboniferous, Britain had already passed through more than one major phase of mountain building, each followed by long periods of erosion and structural collapse. The Caledonian mountains were long eroded, and the Variscan belt of southern Britain was entering its final stages of decay. Yet tectonic influence did not fade away. Instead, the dominant regime changed. Britain was no longer being compressed – it was being stretched.

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A tectonic history of Britain (Part 2): When mountains fall – collapse, basins and the foundations of Britain’s lowlands

The collision that assembled Britain at the end of the Silurian (see A history of the plate tectonics of Britain (part 1): Britain assembled – oceans, collisions and the making of a geological patchwork) did not mark the end of tectonic influence on the landscape. Instead, it marked the beginning of a new phase – one that is often less intuitively grasped, but just as important. Mountain belts are temporary features. Once continental collision ceases, thickened crust becomes gravitationally unstable. Erosion strips material from the surface, while extension and faulting affect the deep roots of the orogen. The geological record that follows is not one of rising peaks, but of collapse, subsidence and redistribution.

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Book review: Geology: an illustrated history, by David Bainbridge

At first glance, Geology: an illustrated history appears to be another entry in the now familiar genre of large-format, image-rich popular science books. In practice, however, David Bainbridge has produced something rather more distinctive: a visually driven history of geology in which images – maps, diagrams and artefacts – take a leading role, with the text providing interpretation and context.

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A tectonic history of Britain (Part 1): Britain assembled – oceans, collisions and the making of a geological patchwork

Britain is often described as geologically quiet. There are no active volcanoes, no subduction zones, and only modest earthquakes. Yet, for its size, few countries display such a concentration of geological variety. Mountain uplands, volcanic terrains, deeply folded rocks, and ancient metamorphic cores all occur within a relatively small area. The explanation for this diversity lies not in Britain’s present tectonic setting, but in a long and complex tectonic history that assembled the country piece by piece from fragments that originated far apart.

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Book review: Explaining the Earth: An Introduction to the Earth and its Systems, by Paul Binns

Paul Binns’ Explaining the Earth: An Introduction to the Earth and its Systems is an attractive and highly accessible introduction to the planet and its major systems. Beautifully illustrated throughout with full-colour photographs and clear explanatory diagrams, it offers a brisk survey of the familiar territory of introductory Earth science – rocks and minerals, plate tectonics, oceans and atmosphere, the Earth’s interior, mountains, deserts and so on, and the processes that shape them.

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Book review: The Oldest Rocks on Earth: A Search for the Origins of Our Planet, by Simon Lamb

The Oldest Rocks on Earth is composed in a consciously popular-science style, making it an enjoyable read, as well as an informative one for readers interested in how geologists reconstruct the earliest history of our planet. This approach allows Simon Lamb to interweave the science with his own research history, particularly his PhD work and later field studies in Swaziland (now renamed Eswatini), where he investigated some of the oldest rocks on Earth.

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Book review: Planetary Geology: An Introduction (3rd ed), by Dominic Fortes and Claudio Vita-Finzi

Planetary geology occupies an awkward but fascinating position between disciplines. It draws its physical framework from physics and astronomy, its observational tools from remote sensing and space missions, and its interpretative instincts from terrestrial geology. Planetary Geology: An Introduction by Dominic Fortes and Claudio Vita-Finzi has, since its first appearance, sought to bring these strands together into a coherent teaching text.

Climate Europe Fossils Geology Glaciers Minerals Minerals Museums & societies Palaeontology Plate Tectonics

Geology museums of mainland Europe: The Naturmuseum Südtirol Bolzano, Austria

Jon Trevelyan (UK) The Naturmuseum Südtirol is housed in an historic building in the old town of Bolzano and was opened in 1997 in its current form. Its major theme consists of the geology of South Tyrol, that is, the region’s rocks, minerals (Fig. 1) landscapes, tectonics, its natural habitats … Read More

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Volcanoes, monsoons and a flooded supercontinent (Part 1): The climate engine of the Carnian Pluvial Event

This is the first of three articles on the Carnian Pluvial Event (CPE), often referred to as an ‘event’, although increasingly recognised as a prolonged episode, as I will discuss) of the Triassic that seems to have grown in importance and interest, and only become more widely known in relatively recent times. In this article, I will introduce the topic, concentrating on what might be called the “climate engine” driving what was happening.

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A pebble across Deep Time: From Staffordshire to Budleigh Salterton and back again

I found the pebble almost by accident, while staying with friends near Eccleshall in Staffordshire. We had taken their two dogs (the much missed Holly and Chutney) out for an afternoon walk – the kind of slow, stop-start loop where the dogs dictate the pace and the conversation meanders as much as the footpath. Along a muddy stretch of track, something smooth and rounded caught my eye: a faintly banded, reddish stone lying half-buried among the usual Midlands gravel and mud.