Inferior Oolite









































Inferior Oolite Group
Stratigraphic range: Aalenian – Bathonian (Middle Jurassic)

Inferior Oolite Leckhampton Hill.jpg
Inferior Oolite at Leckhampton Hill, Gloucestershire.

Type Group
Sub-units

  • East Midlands - Northampton Sand Formation, Grantham Formation, Lincolnshire limestone

  • Cotswolds - Birdlip Limestone, Aston Limestone, Salperton Limestone

  • Dorset - undifferentiated
Underlies Great Oolite Group
Overlies Lias Group
Thickness 0 - 120m
Lithology
Primary limestones
Other
sandstone, mudstone
Location
Country England

The Inferior Oolite is a sequence of Jurassic age sedimentary rocks in Europe. It was deposited during the Middle Jurassic.[1] The Inferior Oolite Group as more recently defined is a Jurassic lithostratigraphic group (a sequence of rock strata) in southern and eastern England . It has been variously known in the past as the Under Oolite (or Oolyte), the Inferior Oolite, the Inferior Oolite Series and the Redbourne Group.[2]




Contents






  • 1 Outcrops


  • 2 Lithology and stratigraphy


  • 3 Vertebrate fauna


  • 4 See also


  • 5 Footnotes


  • 6 References





Outcrops


The rocks are exposed from Dorset and Somerset eastwards and northwards through the English Midlands to Yorkshire.[3] It is present at depth in the Wessex-Weald Basin, where it reaches its greatest thickness of 120m.



Lithology and stratigraphy




Inferior Oolite (Doulting Stone) at Doulting Stone Quarry, England.


The Group comprises up to 120m thickness of oolitic limestones and subordinate sandstones and mudstones laid down during the Jurassic Period. In the East Midlands it comprises (in descending order i.e. oldest last) the Lincolnshire Limestone, Grantham and Northampton Sand formations whereas in the Cotswold Hills it comprises the Salperton Limestone, Aston Limestone and Birdlip Limestone formations.[4][5]
The limestones are rich in organic material.[citation needed] The ammonite Parkinsonia parkinsoni, an index fossil for the Bathonian,[6] is native to the Inferior Oolite of Burton Bradstock.[citation needed]



Vertebrate fauna


Ornithopod tracks geographically located in North Yorkshire, England.[1] Ornithopod and theropod tracks present in North Yorkshire, England.[7] A supposed dermal spine long thought to be from a stegosaur is actually a caudal vertebra referable to Archosauria indet.[8]


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 of the Inferior Oolite
Genus
 Species
 Location
 Stratigraphic position
 Material
 Notes
 Images

Cetiosaurus

C. epioolithicus
  • North Yorkshire, England.[7]






Magnosaurus





Megalosaurus





Megalosaurus

Indeterminate
  • Wiltshire, England.[9]



Duriavenator

D. hesperis
  • Dorset, England.[10]

"Skull elements."[11]

Magnosaurus[10]

M. nethercombensis[10]
  • Dorset, England.[10]

"Dentaries, vertebrae, pubis, femora, [and] tibiae."[11]

Megalosaurus[1]

M. bucklandii
  • Gloucestershire, England.[12][13]



M. hesperis[1]
  • Dorset, England.[10]

"Skull elements."[11]

Moved to the new genus Duriavenator in 2008.

Indeterminate

  • Northamptonshire, England.[14]

  • Somerset, England.[15]



Thyreophora

Indeterminate[8]
  • Dorset, England.[1]




See also



  • List of dinosaur-bearing rock formations


Footnotes





  1. ^ abcde Weishampel, David B; et al. (2004). "Dinosaur distribution (Middle Jurassic, Europe)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 538–541. .mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
    ISBN 0-520-24209-2.


  2. ^ Waters, C.N. et al. 2007 Stratigraphical Chart of the United Kingdom: Southern Britain British Geological Survey (poster)


  3. ^ British Geological Survey 1:50,000 scale geological map (England & Wales) sheets


  4. ^ http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=INO (BGS on-line lexicon of rock units)


  5. ^ Waters, C.N. et al 2007 Stratigraphical Chart of the United Kingdom:Southern Britain British Geological Survey (poster)


  6. ^ Wynn Jones, R: Applied Paleontology. page 146, Cambridge University Press


  7. ^ ab "Dinosaur distribution (Middle Jurassic; Europe; North Yorkshire, England)." Weishampel, et al. (2004). Page 539.


  8. ^ ab Peter M. Galton (2017). "Purported earliest bones of a plated dinosaur (Ornithischia: Stegosauria): a "dermal tail spine" and a centrum from the Aalenian-Bajocian (Middle Jurassic) of England, with comments on other early thyreophorans". Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. 285 (1): 1–10. doi:10.1127/njgpa/2017/0667.


  9. ^ "Dinosaur distribution (Middle Jurassic; Europe; Wiltshire, England)." Weishampel, et al. (2004). Page 540.


  10. ^ abcde "Dinosaur distribution (Middle Jurassic; Europe; Dorset, England)." Weishampel, et al. (2004). Page 539.


  11. ^ abc "Table 4.1," in Weishampel, et al. (2004). Page 73.


  12. ^ "Dinosaur distribution (Middle Jurassic; Europe; Gloucestershire, England)." Weishampel, et al. (2004). Page 538.


  13. ^ BENSON, R. B. J. (2009), AN ASSESSMENT OF VARIABILITY IN THEROPOD DINOSAUR REMAINS FROM THE BATHONIAN (MIDDLE JURASSIC) OF STONESFIELD AND NEW PARK QUARRY, UK AND TAXONOMIC IMPLICATIONS FOR MEGALOSAURUS BUCKLANDII AND ILIOSUCHUS INCOGNITUS. Palaeontology, 52: 857–877. doi: 10.1111/j.1475-4983.2009.00884.x


  14. ^ "Dinosaur distribution (Middle Jurassic; Europe; Northamptonshire, England)." Weishampel, et al. (2004). Pages 539-540.


  15. ^ "Dinosaur distribution (Middle Jurassic; Europe; Somerset, England)." Weishampel, et al. (2004). Page 538.




References



  • M. J. Benton and P. S. Spencer. 1995. Fossil Reptiles of Great Britain. Chapman & Hall, London 1-386

  • J. B. Delair. 1973. The dinosaurs of Wiltshire. The Wiltshire Archaeological and Natural History Magazine 68:1-7

  • Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. 
    ISBN 0-520-24209-2.










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