The Winter Programme and Synopses from 2017 - 2018
Tuesday August 29th
Dr David Unwin (Dept. of Museum Studies, University of Leicester) Chinese pterodactyls – flying dragons in the days of the dinosaurs
(A talk given in the Lord Mayor’s Room of the New Walk Museum)
During the time of the dinosaurs the skies were filled with extraordinary flying creatures called pterosaurs, popularly known as pterodactyls. Pterosaurs were unlike any other animal, living or extinct: with blade-like jaws bristling with teeth, long necks, large claws on their fingers and toes and ‘clever’ membraneous wings, they were skilled fliers and top-predators, feeding on insects, fish, early birds and perhaps even baby dinosaurs. While most were only crow or heron-sized some were giants with wingspans of 10 meters or more – as big as a small aircraft. Rocks in China have produced an amazing variety of pterosaurs including exciting finds such as ‘Mrs T’ a unique example of a pterosaur preserved together with its eggs. Such discoveries have completely changed the way we think about these Mesozoic dragons, and highlight the prominent role that they played in worlds inhabited by dinosaurs.
Wednesday October 4th
Dr Tory McCoy (University of Leicester) on Soft Tissue Preservation in Amber
Preservation of fossils in amber appears to be simple and perfect: an organism is entombed in resin, which hardens, protecting the carcass and ‘freezing’ it in time. However, although almost all fossils in amber look perfect to the naked eye, recent studies have revealed that this is often just an illusion. The best preserved specimens are indeed perfect, and include external cuticle as well as internal soft tissues such as flight muscles and neural tissues. In contrast, many other amber sites are simply hollow molds, stained to a life-like colour with remnant carbon. Actualistic taphonomic experiments reveal the factors that contribute to this variable preservation of fossils in amber, and influence our understanding of the amber fossil record.
Wednesday October 18th
Dr Roger Mason spoke about his groups discovery of Ediacaran fossils, and the bioengineering in the Gorges of the Yangtze River of China
The Yangtze River is the third longest in the world, rising at 5,342m above the sea, on the Tibetan Plateau, and flowing east to the East China Sea. Its entire course lies in the People’s Republic of China. It was diverted eastwards from the Sichuan Basin, across central Chinese mountain ranges, by river capture, in relatively recent geological times, cutting three deep gorges. The rocks of the mountains had been thrown into arches and downfolds by a complex continental collision that ended about 200 million years ago. The eastern Xiling Gorge cuts through the highest anticline, down to Archaean rocks aged up to 3000 Ma old, which are intruded by a large mass of 800 Ma granite. This is the site of the controversial Sandouping Dam, which has an electricity generation capacity of 22,500 MW (about 1/6 of the maximum power transmitted through our British National Grid). The Precambrian crystalline rocks are overlain by a continuous succession of Proterozoic to Permian sedimentary rocks; including unmetamorphosed Cryogenian tillites; fossiliferous Ediacaran carbonates; and fossiliferous Cambrian and Ordovician rocks. My colleagues, from China Geosciences University in Wuhan, and I have discovered a continuous Ediacaran to Cambrian succession near the Dam that contains new, and yet, undescribed Ediacaran fossils. The top of the succession has a sharp boundary between white Ediacaran dolostone and black Cambrian shale, and we are continuing to search for fossils, and improve our description of the succession.
Wednesday November 1st
Professor David Siveter (University of Leicester) The Herefordshire Lagerstätte: soft-bodied virtual fossils from a Silurian volcanic ash
Our understanding of the history of life on Earth relies heavily on the fossil record, and especially on rare cases of exceptional preservation, where soft parts of animals and entire soft-bodied animals are preserved. Such exceptionally preserved fossils provide an unparalleled view of animal palaeobiology and the true nature of animal biodiversity.
On-going research has recovered spectacular fossils from Wenlock Series Silurian rocks (~430 million years) of Herefordshire in the Welsh Borderland. Representing one of the rare Silurian exceptionally preserved fossil deposits, this biota of global importance contains representatives of many major groups of animals, including molluscs, echinoderms, brachiopods, polychaetes, and most especially a range of arthropods. The animals preserved are primarily epibenthic, but infaunal and nektobenthic forms are also represented. The fossils are preserved as three-dimensional calcite void-fills in carbonate nodules and are impossible to extract by standard methods. The specimens are studied using tomographic techniques to produce high fidelity three-dimensional virtual fossils that yield a wealth of palaeobiological information. These fossils are crucial in helping to fill a gap in our knowledge of the history of life and to resolve controversies about the relationships and evolution of animals still alive today.
Wednesday November 15th
Professor Mike Lovell (University of Leicester) Petrophysics in the kitchen
Petrophysics is strictly, rock physics, and is the study of rocks at varying temperatures and pressure, over a period of time; the importance of the fluids cannot be overstated. Many of the concepts also apply in the kitchen, where a chef or cook can conjure up through art and/or science, a magical feast from seemingly simple ingredients. The range of food produced by an eminent chef, whether he is the angry one or the mad-scientist one, or she be the Nation’s treasure or simply a domestic goddess, is staggering. But this phenomenal range is perhaps equalled only by the strange and unusual behaviour in nature, in the distribution of gas, oil and water within a reservoir formation.
This talk looks at how Petrophysics is at times analogous to the physics and chemistry experiments we undertake in the kitchen and how understanding the properties of the components and their behaviour with temperature and pressure is the key. From stale bread to that perfect soufflé; a soft boiled egg to a perfect cold beer; all are underpinned by the interaction of solids and fluids at varying temperatures and pressures. And of course, we shouldn’t forget the peculiar properties of water which also affect the behaviour of reservoir fluids, and how the addition of salt to water may be significant, or not.
So come along for some topical tips on how to survive the festive season in the kitchen and an introduction to the wonderful world of petrophysics.
Wednesday November 29th
An Anthropocene Day, and Professor Jan Zalasiewicz (University of Leicester) addressed the Section in the evening
This presentation outlines the work of the Anthropocene Working Group in gathering evidence to constrain and assess the Anthropocene as a potential new formal chronostratigraphic unit within the Geological Time Scale. Human activity is leaving a pervasive and persistent signature on Earth and vigorous debate continues about whether this warrants recognition as a new geologic time unit. Evidence includes the appearance and rapid dispersal of many new mineral forms (including metals, plastics and industrial fly ash), rock types (including concrete) and sediment bodies including artificial ground, together with sediments released by land use changes. Humans now move more terrestrial sediment than all natural fluxes by rivers, wind, and glaciers. Chemical signals include isotope patterns altered by perturbations to the carbon and nitrogen cycles at rates and magnitudes unprecedented in Quaternary times, atmospheric gas changes preserved in ice, disseminated metal and persistent organic pollutant and artificial radionuclides traces, many of which are novel signatures. Biological evidence includes the consequences of extinctions, geologically unprecedented species invasions and marked assemblage changes. Recent climate and sea level trends are outside the Holocene trajectory, though global temperature and sea level are still within the Quaternary interglacial envelope. Anthropogenic influence on stratigraphic signals commenced thousands of years ago, but the most pronounced inflection in most global trends away from Holocene patterns is in the mid-20th century. The presentation will also describe ongoing plans for developing a proposal for a formal “golden-spike” section, looking at some of the potential host environments.
Wednesday December 13th
Christmas Meeting held at the New Walk Museum, Leicester
Wednesday January 10th
Dr David Holwell (University of Leicester) Mineral exploration in Zambia
The massive increase in the predicted shift to electric cars in the coming decades means that the demand for metals used in batteries is increasing significantly. One of the key metals required in lithium ion batteries, used to power electric cars is nickel and thus battery makers s are increasingly turning to nickel to help power growing global electric car sales. Nickel, along with other key environmentally significant elements used in the automotive industry (platinum group elements – PGE - in catalytic converters) are found in very specific geological environments. Nickel, copper and PGE are found in magmatic setting where mafic and ultramafic magmas host metal-rich sulfide deposits. Key locations for these are around the margins of ancient cratonic crust, and one such area – between the Congo and Kalahari cratons – is a key potential site for discovering new deposits of these technologically important metals. This talk will cover the future demand of Ni and the PGE by the changing automotive industry, and by way of using Zambia and its neighbouring countries, show the key geological controls from the mantle up into the crust that are required to produce these deposits, and how we can use knowledge of these to make predictive exploration models.
Monday January 22nd
Leicester Literary & Philosophical Society Parent Body Lecture at the New Walk Museum, Leicester
Professor John Dewey (University of California, and University College Oxford)
Tectonic Evolution of Earth
Wednesday January 24th
Dr Tom Fletcher (University of Leicester) Hydrodynamics of fossil fishes
Fishes are the most diverse vertebrates on Earth, conquering almost every habitat of our pale blue dot. They can be found at sub zero temperatures, in forest puddles, desert oases, caves, the deepest seas, and mountain streams. Yet despite a bewildering variety of adaptations, fish evolution is ultimately governed by the inescapable laws of physics. Fishes have been fine-tuning their solutions to movement through water for hundreds of millions of years, and have influenced the design of our own technology for centuries. Biomimetics is a subject which seeks inspiration from the natural world, but the potential wealth of engineering solutions in the fossil record has so far been ignored. This lecture will explore the biomechanics of modern sharks, their fossil fish ancestors, and the engineering lessons we can learn from prehistoric life.
Wednesday February 7th
Our Members' Evening. Held at the New Walk Museum, Leicester, LE1 7EA
Wednesday February 21st
Dr Geoffrey Warrington (University of Leicester) Mineralization in the Cheshire Basin
In the Cheshire Basin sediment-hosted mineralization, comprising barite and localised copper-dominated polymetallic deposits, occurs mainly in the Mid-Triassic Helsby Sandstone. Copper ores were mined principally in the Alderley district, NE Cheshire, but also in W Cheshire, and at sites in N Shropshire. Small amounts of lead and cobalt ores were also recovered, mainly at Alderley. At Alderley, mineralization occurs at three main levels in the ore-bearing succession. These are accessible in c.15 km of disused mine workings. The form of ore bodies at each level differs, and reflects control largely by host rock facies (fluvial or aeolian) and partly by faults.
In 1977, the speaker proposed that minerals at Alderley were precipitated from low temperature, intrastratal, brines, in a structural trap capped by the Mercia Mudstone; possibly in a reducing environment, created by hydrocarbons, that migrated into the same trap. Subsequent studies have substantiated, and refined, this basic process. The mineralization in the Cheshire Basin is now envisaged as the product of a multistage diagenetic process in latest Triassic, to Early Jurassic, time (c. 205 to 175 Ma); it is now represented by over fifty five (55), mostly secondary, species.
Wednesday March 7th
Dr Dan Smith (University of Leicester) Tellurium Tomorrow: Solar Power, Supply, Demand, and Waste, of a Rare Material
Tellurium is one of the least abundant elements in the Earth’s crust, yet society has a burgeoning need for a reliable supply of this semi-metal, particularly as a key ingredient in solar panels. Although established uses in alloys and computer components have declined, rapid growth in solar power has dramatically increased the consumption of tellurium. Tellurium is almost exclusively produced as a by-product of refining other metals (chiefly copper), and at present, industry is poorly positioned to increase supply in line with growing demand. Alternative sources exist however; a number of mineral deposit types are notably enriched in tellurium. Why some deposits are enriched in Te, in particular, is puzzling; this lecture will unpick some reasons why this rare element becomes enriched in particular environments.
A continuing challenge for tellurium supply has been in the “how” of recovering it. There are a number of metallurgical problems with the extraction of the element even from enriched ores. This talk will outline some novel solvents being developed at the University of Leicester that have the potential to radically change the way we process ore minerals, and transform the supply of rare metals such as tellurium, all while reducing the economic and environmental impacts of mineral processing.
Saturday March 10th
Our Annual Saturday Seminar was held in the University of Leicester Campus
The 50th Anniversary of the discovery of the Rutland Dinosaur
The Life and Times of the Rutland Dinosaur
Big feet in a small County
Wednesday March 21st
The Annual General Meeting and Chairmans' Address by Dr Mark Evans (New Walk Museum Leicester)
Tales of collapsible skulls of the Oxford Clay and more: the Cryptoclidid plesiosaurs.
Cryptoclidid plesiosaurians are the only family-level clade of plesiosauroid, or long-necked and small headed, plesiosaurians known from the Middle and Upper Jurassic. Taxa now included in the group have been regarded as a good model for a “typical” plesiosaur, mainly due to their presence in the Callovian Peterborough Member of the Oxford Clay Formation. Well preserved specimens therefore form a significant component of the renowned Leeds collection and were comprehensively monographed by Andrews in 1910 and revised by Brown in 1981. Recent cryptoclidid discoveries along with improved knowledge of other plesiosaurians has shown them not to be so “typical” after all. This talk will review some of these developments and present ongoing research into a new specimen in the Leicester Arts and Museums collection.