Blue Lias

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Blue Lias Formation
Stratigraphic range: Rhaetian-Lower Sinemurian Planorbis-Semicostatum ~201–198 Ma
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Lower Lias sequence exposed at Nash Point, Glamorgan, Wales
TypeGeological formation
Unit ofLias Group
Sub-unitsWilmcote Limestone Member, Saltford Shale Member, Rugby Limestone Member
UnderliesCharmouth Mudstone Formation
OverliesLilstock Formation
Thicknessup to 120 metres (390 ft)
Lithology
PrimaryLimestone
OtherMudstone
Location
RegionEurope
CountryUnited Kingdom
ExtentSouth West England,
Wales
Type section
LocationSaltford railway cutting

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The Blue Lias is a geological formation in southern, eastern and western England and parts of South Wales, part of the Lias Group. The Blue Lias consists of a sequence of limestone and shale layers, laid down in latest Triassic and early Jurassic times, between 195 and 200 million years ago. The Blue Lias is famous for its fossils, especially ammonites.

Its age corresponds to the Rhaetian to lower Sinemurian stages of the geological timescale, thus fully including the Hettangian stage. It is the lowest of the three divisions of the Lower Jurassic period and, as such, is also given the name Lower Lias. Stratigraphically it can be subdivided into three members: the Wilmcote Limestone, Saltford Shale and Rugby Limestone.[1]

Lithology and facies

The Blue Lias comprises decimetre scale alternations of argillaceous limestone and mudstone. These alternations are caused by short-term climatic variations during the Early Jurassic attributed to orbital forcing (Milankovitch cycles). These limestone-mudstone alternations pass up into a clay member formerly known as the Lower Lias Clay now the Charmouth Mudstone. This lithology consists of monotonous mudstones weathering to clay at the surface. Sparse thin limestone and nodule bands are seen where the rocks are exposed. The deposition of a clay-rich mudstone member normally indicates deposition in a deeper marine environment. The lowest beds of the formation are referred to as the "Pre-planorbis beds" in reference them being deposited before the first appearance of the ammonite Psiloceras planorbis.

Wilmcote Limestone

In certain restricted parts of Britain, the lowermost member of the Blue Lias is the Wilmcote Limestone. It lies above the Cotham Member of the Lilstock Formation and beneath the Saltford Shale Member.[2] The Wilmcote Limestone of central England was formerly quarried close to Stratford-upon-Avon, for example at Wilmcote, Temple Grafton and Binton. It is roughly 200 million years old, dating back to the dawn of the Jurassic Period.

Much of the Wilmcote Limestone is very fine-grained, blue-grey when fresh, and very finely layered. Fossils are quite rare, except in the lowest beds. It was formerly used for a variety of purposes, including walling, building, paving, gravestones, cement-making and as a source of agricultural lime. It is no longer quarried, and most of the old quarries are either infilled or overgrown.

Geologists think that the Wilmcote Limestone originated as layers of fine-grained mud on the floor of a sheltered, shallow muddy sea or lagoon that covered parts of central England at the dawn of the Jurassic Period. Very little life could tolerate the stagnant conditions on the seabed. As a consequence the mud was seldom disturbed, which is why the fine, paper-like layering is preserved.

Above the sea bed, the shallower waters supported ammonites, fish, and marine reptiles (ichthyosaurs and plesiosaurs). Their remains were discovered in the Wilmcote Limestone quarries during the nineteenth century. The Warwickshire Museum[3] houses a collection of these fossils and some are on display at the Market Hall Museum in Warwick.[4][5]

Occurrence

File:Blue lias cliffs at Lyme Regis.jpg
Blue Lias formation at Lyme Regis, Dorset

The Blue Lias is a prevalent feature of the cliffs around Lyme Regis and Charmouth, on the Jurassic Coast in Dorset, where it exists in layers of limestone interspersed with softer clay. It is also notable for its presence in Somerset, particularly around the Polden Hills, Keinton Mandeville and Glastonbury area, and it forms a broad plain across the East Midlands. It also appears near Whitby in Yorkshire and Southam in Warwickshire where a pub is named after it. There are outcrops along the coast of South Wales, notably that of the Vale of Glamorgan.[6] The type section of the Blue Lias is at Saltford near Bath.

Use in construction

File:Lytes Cary 2009 South front, bay window.JPG
Lytes Cary, Somerset, built of Blue Lias with Ham stone dressings around the windows

Blue Lias is useful as a building stone, and as a source of lime for making lime mortar. Because it is argillaceous, the lime is hydraulic. Since the mid-nineteenth century, it has been used as a raw material for cement, in South Wales, Somerset, Warwickshire, and Leicestershire. The cement plant quarry at Rugby, Warwickshire is probably the best exposure of the formation: more than 100 layers can be seen.

In areas where Blue Lias is quarried it has been used in buildings and churches as well as tombstones in cemeteries. An example of a Blue Lias town is Street, near Glastonbury. Other examples of Blue Lias buildings can be found in the nearby towns of Somerton and Ilchester.

It remains popular in more modern-day surroundings where it is used in the construction of new housing developments and extensions for existing buildings in conservation areas. Blue Lias is mainly used in flooring, walling and paving slabs – both coursed and layered. It is also used in the making of flagstones and cobbles.

There are only four quarries in Somerset quarrying Blue Lias at present. AR Purnell at Ashen Cross Quarry in Somerton have been mining blue lias stone since 1996. Hadspen Quarry Ltd. Hadspen Quarry operate one in Keinton Mandeville. Ham & Doulting Stone Co Ltd. operate one of these, Tout Quarry near Somerton.[7]

Paleofauna

The rock is rich in fossil remains from the Jurassic period. The blue-grey colour is provided by its iron content, enclosed to a large extent in pyrites.[8]

File:LiasSizeChart.svg
Blue Lias archosaurs
Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Dinosaurs

Theropods

Theropods of the Blue Lias
Genus Species Location Stratigraphic position Material Notes Images
Dracoraptor D. hanigani Lavernock Point Pre-planorbis Beds, lowermost Hettangian NMW 2015.5G.1–2015.5G.11 "a disarticulated, but associated partial skeleton" A coelophysoid theropod
File:Dracoraptor.PNG

Dornraptor[9]

D. normani

Lower cliff face, Charmouth

Black Ven Marl Member?

  • GSM 109560, Left femur
  • NHMUK OR 39496, Partial hind limb

An Averostran theropod, possible Ceratosaur. In 2024 was formally described, but referred to the Blue Lias.[10] A paper non quoted on the description relocated it on the Charmouth Mudstone Formation.[11]

File:Merosaurus.jpg
Sarcosaurus S. woodi Wilmcote angulata zone, late Hettangian (NHMUK PV R3542) Rugby Limestone Member liasicus to semicosatum zones, lowermost Sinemurian (WARMS G667–690) Paratype specimens: NHMUK PV R3542, complete right tibia WARMS G667–690, partial skeleton Basal neotheropod, holotype specimen is known from the Scunthorpe Mudstone
File:Sarcosaurus life restoration.jpg

Pterosaurs

Pterosaurs of the Blue Lias
Genus Species Location Stratigraphic position Material Notes Images
Dimorphodon D. macronyx Aust Cliff, Lyme Regis NHMUK PV R 1034, NHMUK PV OR 41212, NHMUK PV R 1035 A basal pterosaur
File:Dimorphodon macronyx.jpg

Fish

Numerous fish species are known from the Blue Lias and overlying Charmouth Mudstone.

Fish of the Charmouth Mudstone Formation
Genus Species Location Stratigraphic position Material Notes Images
Acrodus A hybodont shark
Hybodus A hybodont shark
Palidiplospinax A synechodontiform shark
Squaloraja S. tenuispina, S. polyspondyla Closely related to modern chimaeras
Myriacanthus M. paradoxus, M. granulatus A myriacanthid closely related to modern chimaeras
Dorsetichthys D. bechei A stem-group teleost
File:Pholidophorus bechei Lyme Regis Teylers.JPG
"Coccolepis" "C." liassicus A coccolepidid fish, probably does not belong to the genus
Cosmolepis C. ornatus An enigmatic basal actinopterygian
File:FOS275.jpg
Holophagus H. gulo A coelacanth
Chondrosteus C. acipenseroides A chondrosteid acipenseriform fish, related to sturgeon and paddlefish
File:FMIB 51725 Chondrosteus acipeenseroides Egerton Family Chondrosteidae.jpeg
Oxygnathus O. ornatus A palaeonisciform fish
Saurorhynchus S. brevirostris, S. anningae A member of Saurichthyiformes
Ptycholepis P. gracilis, P. curtus A palaeonisciform fish
Dapedium Spp. A dapediiform fish
Caturus Spp. An amiiform fish related to bowfins
Platysiagum P. sclerocephalum A platysiagid fish
Furo F. orthostomus A member of Ionoscopiformes within Halecomorphi[12] File:Furo orthostomus.jpg
F. philpotae
Heterolepidotus H. latus A member of Ionoscopiformes within Halecomorphi[13]
H. serrulatus

Ichthyosaurs

Ichthyosaurs of the Blue Lias
Genus Species Location Stratigraphic position Material Notes Images
Ichthyosaurus I. larkini[14] Lyme Regis & Charmouth in Dorset, Street and the north coast of Somerset, and other inland sites across England Unknown, possibly Pre-planorbis beds Holotype: BRSUG 25300, referred: AGC 11, CAMSM J5957, NHMUK PV OR5595
File:Ichthyosaurus communis in London.jpg
I. somersetensis[14] Holotype: ANSP 15766 referred: BRSMG Cb4997, NHMUK PV OR2013AGC 16, ROM 26029
I. communis[15] Unknown BMNH R1162
Protoichthyosaurus P. prostaxalis[16] Somerset Unknown, probably Pre-planorbis beds Holotype: BRLSI M3553, "a partial skull, pectoral girdle and both forefins, preserved in ventral view"
Wahlisaurus W. massarae[17] Sutton Hill (Stowey) Quarry, Bishop Sutton Pre-planorbis beds BRSMG Cg240, "a practically complete right coracoid"
?Shastasauridae Indeterminate Penarth Psiloceras planorbis Biozone NMW95.61G.1, radius[18] Estimated length of 12–15 metres
Temnodontosaurus[19] T. platyodon PV R 1158, consisting of a Skull, Lower Jaw and Cervical Vertebrae
Excalibosaurus E. costini[20][21] North Somerset coastline Arietites (Coroniceras) bucklandi Biozone Holotype: BRSMG Cc881, "...a complete skull, with associated forefin, pectoral girdle, vertebrae and ribs..."

referred: ROM 47697

File:ROM 47697, Excalibosaurus, Royal Ontario Museum.png
ROM 47697, a nearly complete skeleton of Excalibosaurus on display at the Royal Ontario Museum.

Plesiosaurs

Plesiosaurs of the Blue Lias
Genus Species Location Stratigraphic position Material Notes Images
Atychodracon A. megacephalus[22] Street-on-the-Fosse Lowermost Blue Lias Holotype:BRSMG Cb 2335 Rhomaleosaurid
File:Plesiosaur skeleton, New Walk Museum.JPG
Avalonnectes A. arturi[10] Street, Somerset (referred specimen) NHMUK 14550, "the posterior portion of the skull, and a partial postcranial skeleton" uncatalogued partial specimen Rhomaleosaurid
File:Holotype of Avalonnectes arturi NHMUK 14550.png
Eurycleidus E. arcuatus Street NHMUK 2030 (lectotype), 2027-2029, 2047, 2061, R1317-1319 (paralectotypes, probably belonging to the same individual) Rhomaleosaurid
Macroplata M. tenuceps Harbury, Warwickshire NHMUK PV R5488, nearly complete skeleton Rhomaleosaurid
Eoplesiosaurus E. antiquior[10] Watchet, Somerset TTNCM 8348, postcranial skeleton Basal Plesiosauroid
File:Holotype of Eoplesiosaurus antiquior.png
Plesiosaurus P. dolichodeirus[23] Lyme Regis and Charmouth, Dorset Sinemurian stage (upper Blue Lias, Shales-with-Beef member or lower Black Ven Marl NHMUK PV OR 22656, complete skeleton Plesiosaurid
File:Plesiosaurus dolichodeirus NHM.jpg
The holotype of Plesiosaurus dolichodeirus, on display at the Natural History Museum in London
Stratesaurus S. taylori[10] Street, Somerset lowermost Hettangian OUMNH J.10337, "a skull and partial postcranial skeleton including anterior cervical and pectoral vertebrae, a partial hindlimb and ilium" Rhomaleosaurid
File:Holotype of Stratesaurus taylori OUMNH J.10337.png
Thalassiodracon T. hawkinsii Street Pre-planorbis Beds NHMUK 2018 "almost complete skeleton missing distal parts of limbs" CAMSM J.35181, partial skeleton Pliosaurid affinities[24]
File:Thalassiodracon NHM.jpg

Insects

Insect compression fossils are known from the localities of Binton in Warwickshire and Copt Heath near Birmingham.[25][26][27]

Insects of the Blue Lias
Genus Species Location Stratigraphic position Material Notes Images
Omma O. liassica Binton Planorbis An ommatid beetle, genus extant
Holcoptera Ho. schlotheimi An aquatic beetle belong to the extinct family Coptoclavidae
Liassophila L. hydromanicoides A member of Mecoptera
Orthophlebia O. pictipennis An orthophlebiid mecopteran related to living scorpionflies
Hagla H. gracilis An orthopteran belonging to the family Haglidae, related to living grigs
Elcana Indeterminate An orthopteran belonging to the extinct family Elcanidae
Protocoris P. indistinctus A true bug belonging to the family Protocoridae, related to living stink bugs
Archithemis[28] A. liassina A damsel-dragonfly belonging to the extinct family Campterophlebiidae
Liassophlebia L. magnifica A damsel-dragonfly belonging to the extinct family Liassophlebiidae
Necrotaulius Copt Heath A caddisfly belonging to the extinct family Necrotauliidae
Locustopsis L. spectabilis A grasshopper belonging to the extinct family Locustopsidae
Phanerogramma P. heeri A primitive earwig belonging to the extinct family Dermapteridae

See also

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References

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  1. ^ Page Template:Smallcaps/styles.css has no content.Ambrose, K.; 2001: The lithostratigraphy of the Blue Lias Formation (Late Rhaetian–Early Sinemurian) in the southern part of the English Midlands Script error: No such module "webarchive"., Proceedings of the Geologists' Association 112(2), pp. 97-110.
  2. ^ Page Module:Citation/CS1/styles.css has no content."Wilmcote Limestone Member". The BGS Lexicon of Named Rock Units. British Geological Survey. Retrieved 20 April 2014.
  3. ^ Page Module:Citation/CS1/styles.css has no content."Museum Service – Warwickshire Heritage and Culture". Archived from the original on 21 April 2014. Retrieved 20 April 2014.
  4. ^ Ambrose, K., 2001. The lithostratigraphy of the Blue Lias Formation (Late Rhaetian - Early Sinemurian) in the southern part of the English Midlands. Proceedings of the Geologists' Association vol. 112, 97-110.
  5. ^ Williams, B.J. & Whittaker, A., 1974. Geology of the Country around Stratford-upon-Avon and Evesham. Memoirs of the Geological Survey of Great Britain. HMSO, London.
  6. ^ Wilson et al., 1990 "Geology of the South Wales Coalfield, Part VI, the country around Bridgend" Mem Br Geol Surv sheet 261 & 262 (England and Wales)
  7. ^ Page Module:Citation/CS1/styles.css has no content."Strategic Stone Study: A Building Stone Atlas of Somerset and Exmoor" (PDF). English Heritage. p. 11. Retrieved 11 October 2011.
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