GCR block - Bathonian (BAT)


Block Description

UK map showing distribution of GCR sites of GCR block BAT
Distribution of GCR sites of GCR block Bathonian

The GCR sites selected for this GCR Block represent the British geological record of Earth history from about 166 to 161 million years ago (Ma). This interval is the penultinmate Age of the Mid Jurassic Epoch, which spans from 178 to 157 Ma. Rocks that formed during the Mid Jurassic Epoch (part of the Jurassic Period) constitute the Middle Jurassic Series (part of the Jurassic System).

Outcrop pattern

On maps showing the solid geology of England, Middle Jurassic rocks crop out in an almost continuous strip from the Dorset coast to the North Yorkshire coast. In Scotland, Middle Jurassic rocks crop out in scattered patches in the islands to the north-west as well as in northern Scotland.

Palaeoenvironment and palaeogeography

During Early Jurassic times Britain was largely covered by shelf sea, however towards the end of the Epoch there was a significant fall in sea level accompanied by crustal upwarping and vulcanicity in the central North Sea Basin. Consequently, Middle Jurassic rocks reflect a variety of depositional environments including shallow marine, fluvial, deltaic, saltmarsh and coastal lagoon. In addition, limestone and clastic sedimentation (mudstone, siltstone and sandstone) was often widespread.

GCR site selection

For the purposes of site evluation and selection, the GCR sites can be grouped into five themes or ‘networks’, reflecting depositional setting, which was largely controlled by deep-seated structural features. The networks are:

• Wessex Basin

• Cleveland Basin (North Yorkshire sites)

• East Midlands shelf

• Worcester Basin and Shelf (Cotswolds sites)

• Moray Firth and Hebrides basins.

Although the relatively common invertebrate fossils do not have a separate selection category in the GCR in their own right, the scientific importance of many stratigraphy sites lies in their fossil content. Therefore, some of the GCR sites are selected specifically for their fossil fauna, which facilitates stratal correlation and enables the interpretation of the environments in which the animals lived. Moreover, some sites have international significance because they have yielded fossils that are the ‘type’ material for a taxonomic group.

Palaeontology, fauna and flora

The traditional means of subdividing the Jurassic System is by means of ammonites, abundant and diverse nektonic cephalopod molluscs that, because of their rapid evolution, prove to be almost ideal ‘zone fossils’, enabling the correlation and division of the rocks into relative ages by way of a distinct fossil ‘signature’.

The many different depositional environments that developed in Britain during Mid Jurassic times mean that the fossil record is rich and varied. Invertebrate faunas included simple and compound corals, calcareous sponges and bryozoa, abundant bivalve molluscs, such as oysters, smooth terebratulid and ribbed rhynchonellid brachiopods, gastropods (snails), asteroids (starfish), echinoids (sea urchins) and crinoids (sea lilies). The brachiopods occurred in an abundance that was never repeated on such a scale in later geological times. Microscopic organisms included foraminifera, ostracods and phytoplankton (dinoflagellates and coccolithophorid algae).

Lobster- and shrimp-like crustaceans often produced burrows within sediments, preserved as trace fossils.

Belemnites, relatives of the ammonites, were abundant and along with fish were probably the main food of the aquatic reptiles, which were the largest vertebrate animals in the sea. These included ichthyosaurs, plesiosaurs, pliosaurs, crocodiles and turtles. The fish included both holostean and teleostean bony fishes, and sharks and rays.

On land, dinosaurs had already become established in Mid Jurassic times; primitive mammals formed a minor but important part of the fauna. Land plants of particular prominence were the gymnosperms, notably conifers, cycads, ginkgoes, ferns and horsetails. Insect life included dragonflies.

In contrast to the manner in which most invertebrate fossils are represented in the GCR, fossils of vertebrates, arthropods (except trilobites) and terrestrial plants do have their own dedicated selection categories, owing to the relative rarity of the fossil material. See APD; JUR-CRE-RP; MES-MAM; MES-PALBOT; MZ-TR-FI-A; PALENT.

Volume Introduction


Site List

Your selection found 48 GCR sites. Sites are sorted alphabetically by country, local authority and then by site name -
CodeNameCountryLocal AuthorityGrid RefGCR Site Account
1603Shipmoor Point - Butterstreet CoveEnglandDorset CCSY576836Not available
2830Troll QuarryEnglandDorset CCST594127Not available
1330Watton CliffEnglandDorset CCSY454907Not available
1541Foss CrossEnglandGloucestershireSP056093Not available
1327Hampen Railway CuttingEnglandGloucestershireSP062205Not available
1602Huntsman QuarryEnglandGloucestershireSP125255Not available
2241Kemble CuttingsEnglandGloucestershireST975976Not available
1401MinchinhamptonEnglandGloucestershireSO856017Not available
1349Snowshill Hill (Hornsleasow Quarry)EnglandGloucestershireSP131323Not available
2242Stony Furlong Railway CuttingEnglandGloucestershireSP063106Not available
1402Veizey`s QuarryEnglandGloucestershireST881944Not available
1397Woodchester Park FarmEnglandGloucestershireSO810009Not available
1542Ketton QuarryEnglandLeicestershire CC and RutlandSK978056Not available
1540Brown`s FollyEnglandNorth and North East Somerset, South GloucestershireST794661Not available
1325Hinton CharterhouseEnglandNorth and North East Somerset, South GloucestershireST772572Not available
1326WellowEnglandNorth and North East Somerset, South GloucestershireST740591Not available
1622Hundale Point - Scalby NessEnglandNorth Yorkshire CCTA023949Not available
2795Yons NabEnglandNorth Yorkshire CCTA085842Not available
1396Blisworth Rectory FarmEnglandNorthamptonshireSP717529Not available
1399Cranford St JohnEnglandNorthamptonshireSP924764Not available
1527Irchester Old Lodge PitEnglandNorthamptonshireSP912650Not available
1393Roade Railway CuttingEnglandNorthamptonshireSP750525Not available
1328ThrapstonEnglandNorthamptonshireTL000776Not available
1394WellingboroughEnglandNorthamptonshireSP926698Not available
2093Ardley Cuttings & QuarriesEnglandOxfordshireSP513291Not available
1348Ditchley Road QuarryEnglandOxfordshireSP368198Not available
1600Hook NortonEnglandOxfordshireSP359321Not available
2085Horsehay QuarryEnglandOxfordshireSP456277Not available
1331Sharps HillEnglandOxfordshireSP337358Not available
1400Shipton on Cherwell Cement Works and Whitehill Farm Quarry, GibraltarEnglandOxfordshireSP473177Not available
1329StonesfieldEnglandOxfordshireSP392172Not available
1395Stratton AudleyEnglandOxfordshireSP601255Not available
1332WoodeatonEnglandOxfordshireSP534123Not available
1856Bruton Railway CuttingEnglandSomersetST688347Not available
2120Doulting Railway CuttingEnglandSomersetST651424Not available
2070GoathillEnglandSomersetST672175Not available
1857Laycock Railway CuttingEnglandSomersetST678213Not available
1601Shepton MontagueEnglandSomersetST686316Not available
1539Corsham Railway CuttingEnglandWiltshire CCST863694Not available
2087Gripwood Quarry, Bradford-on-AvonEnglandWiltshire CCST823603Not available
1374Lower Stanton St Quintin Quarry & Stanton St Quintin Motorway CuttingEnglandWiltshire CCST920806Not available
2061BroraScotlandCaithness and Sutherland and Ross and CromartyNC892025Not available
1398Dun Skudiburgh, Isle of SkyeScotlandLochaber, Skye and Lochalsh and Argyll and the IslandsNG374648Not available
1668Duntulm (Cairidh Ghlumaig and Lon Ostatoin)ScotlandLochaber, Skye and Lochalsh and Argyll and the IslandsNG409736Not available
2240Elgol - Glen ScaladalScotlandLochaber, Skye and Lochalsh and Argyll and the IslandsNG517144Not available
2793Isle of EiggScotlandLochaber, Skye and Lochalsh and Argyll and the IslandsNM472885Not available
2794Staffin Bay, Isle of SkyeScotlandLochaber, Skye and Lochalsh and Argyll and the IslandsNG473687Not available
2855ValtosScotlandLochaber, Skye and Lochalsh and Argyll and the IslandsNG509654Not available
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