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Geology and fossils of the Spilsby Sandstone Formation of Nettleton, Lincolnshire, UK

The Jurassic/Cretaceous boundary interval is represented in Lincolnshire by the Spilsby Sandstone Formation, a shallow water marine deposit that spans the Volgian stage of the Jurassic to the Berriasian stage of the Cretaceous (Hopson et al. 2008). The ammonite faunas of this formation are of particular interest, exhibiting affinities with correlative forms in both Russia on the Siberian plain, as well as Greenland and Canada (for example, Casey, 1973; Mikhail Rogov, personal communication 2015).

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Rare Cretaceous ichthyosaur from Lincolnshire

John P Green (UK) As many amateur and professional palaeontologists are aware, ichthyosaurs are well-known aquatic reptiles from the Mesozoic era, which are especially common in Jurassic marine deposits in the UK. They are particularly conspicuous in the Charmouth and Whitby Mudstone Formations of the Lias (Lower Jurassic), as well as the Oxford and Kimmeridge Clay Formations (Upper Jurassic). These horizons have yielded numerous complete and fragmentary remains that grace many private and museum collections across the UK. By contrast, the record of ichthyosaurs in Britain from the Jurassic/Cretaceous boundary interval is somewhat scanty, and only rare and fragmentary remains having been discovered. Any remains discovered from this time interval are therefore of great potential significance. Back in August 1995, during one especially hot summer’s day, I was fortunate to discover fragmentary ichthyosaur remains at a small quarry at Nettleton, Lincolnshire. This quarry exposed the Lower Spilsby Sandstone Formation, which is a shallow water marine deposit that embraces the Jurassic/Cretaceous boundary interval in Lincolnshire (Gaunt et al, 1992). Fig. 1. Locality map of the Castle Top quarry. Reproduced from Green and Lomax 2014; image originally reproduced. by permission of the council of the Yorkshire Geological Society. The specimen was discovered at a single horizon, 3.5m above the base of the formation, which (based upon stratigraphical grounds) falls within the ammonite zone, Subcraspedites preplicomphalus (Casey, 1973). This was formerly considered to fall within the Volgian stage of the latest Jurassic (Gaunt et al, 1992), although more recent work by Hopson et … Read More

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Iguanodon is older than you think: The public and private announcements of Gideon Mantell’s giant prehistoric herbivorous reptile

Martin I Simpson (UK) The details of how the nineteenth century Sussex surgeon and palaeontologist Gideon Mantell came to acquire, describe and announce to the world a new fossil herbivorous reptile, later to be christened Iguanodon and to be included in Owen’s Dinosauria, have been merged together to form one of the most often quoted and legendary stories in the history of vertebrate palaeontology. However, the accuracy of some elements of the story has been questioned by recent scholars, for example, the role played by Gideon’s wife, Mary Ann. She has long been thought to have discovered the first teeth in a pile of road metal by the roadside, while her husband was attending one of his patients in Cuckfield. This is an event which is supposed to have occurred before 1822. In his book, The Fossils of the South Downs, published in that year, Gideon clearly states that Mary had found teeth, although the exact circumstances are not discussed. Some of the teeth acquired by the Mantells were examined by Baron Cuvier. In June 1824, this famous French anatomist ultimately decided that they all belonged to a new and unknown herbivorous reptile. Inspired by this conclusion, Gideon visited the Huntarian Museum of the Royal College of Surgeons in the autumn of 1824 to hunt down a modern reptilian equivalent. However, it was Samuel Stutchbury, not Gideon Mantell, who provided the next ‘light bulb’ moment by noticing a similarity between the teeth of the enigmatic fossil animal and those of … Read More

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Book review: Walking the Jurassic Coast: Dorset and East Devon: The Walks, the rocks, the fossils, by Ronald Turnbull

There are a lot of guide books to the Jurassic Coast Work Heritage Site. This one is intended to provide a useful introduction to the general geology of the coastline, dealing with its formation, fossils and plate tectonics (among many other things), but specifically in the context of walks – for both afternoon rambles and long distance hikes for the more committed.

Book review: Geology and Fossils of the Hastings Area (2nd edition), by Ken Brooks

I remember buying the first edition of Ken Brook’s fascinating little guide on Hastings a long time ago, and bumbling off to Hastings in the hope of finding Lower Cretaceous dinosaurs and tree ferns. Sadly, I was disappointed, as the area is not as productive as, say, the Dorset or North Yorkshire coastlines. Having said that, I have been back a few times armed with that first edition and have enjoyed the visits every time.

Book review: The Geology of Watchet and its Neighbourhood, Somerset (Geologists’ Association Guide No 66), by Eric Robinson

For a long time Watchet has been known to be a superb location for those interested in both fossils and geology but surprisingly, the location has had little in the way of media attention. However, within the last couple of years, this area has begun to attract a lot of interest and this book will further increase its growing popularity.