Pacey, David Edmond;
(1978)
On a tetrapod assemblage from a Mesozoic fissure-filling in South Wales.
Doctoral thesis (Ph.D), University of London.
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Abstract
Ah account is provided of a new assemblage of small tetrapod remains from a Mesozoic fissure in a quarry in South Glamorgan. Other fissures in the same quarry have previously yielded remains of small tetrapods belonging to the Hirmeriella association, generally considered to be of Rhaetic or Rhaeto-Liassic age. On geological grounds the new assemblage - which comprises many thousands of disarticulated skeletal elements - cannot be younger than basal Sinnimurian, but the only way in which its age can be determined at all approximately is on the basis of faunal correlation. The fossils are little mineralised, and generally poorly preserved, identified specimens consisting predominantly of teeth. The following forms are represented: (l)Three new species of sphenodontid. Two are congeneric and belong to a new genus. The remaining form also belongs to a new genus. Both generate closely related to the Late Norian genus Glevosaurus; (2) A non- squamate pleurodont lepidosaur. This form is also a component of the Hirmeriella association; (3) Several species of archosaur; (4) Five distinct forms of the tritylodont Oligokyphus. Three of these are conspecific with the forms which occur at Windsor Hill in Somerset. The remainder - which are probably growth stages - are new; (5) A species of the harmiyid Thomasia; (6) Five species of morganucodont. One is Morganucodon watsoni. A second is congeneric with the molar from Holwell in Somerset called Eozostrodon problematicus. The three remaining species are new, and all belong to new and different genera; (7) One, or several closely related species of a new type of triconoaont; (8) The early therian Kuehneotherium praecursoris. In addition to the identified material of the above mentioned forms, there are a few mammalian— type teeth of uncertain affinites. It is argued on faunal grounds that the age of the assemblage is most probably tower Liassic. It is further argued that the faunal components of the assemblage are contemporaneous with those of the Hirmeriella association, and have hence been drawn from the same terrestrial biota.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | On a tetrapod assemblage from a Mesozoic fissure-filling in South Wales |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| UCL classification: | UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10220393 |
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