The Avon Fissure Fill, also known as the Bristol Fissure Fill or Tytherington Fissure Fill, is a fissure fill in Avon, England (now Bristol) which dates variously from the Norian and Rhaetian stages of the Late Triassic, or possibly as late as the Hettangian stage of the Early Jurassic.Langer, 2004. Basal Saurischia. In Weishampel, Dodson and Osmolska. The Dinosauria Second Edition. University of California Press. 861 pp. The fissure fill at Avon was a sinkhole formed by the dissolution of Lower Carboniferous limestones.
It is paired with the nearby Magnesian Conglomerate; it may have been the same formation as the Magnesian Conglomerate.Magnesian Conglomerate in the Paleobiology Database
Paleofauna +TaxonSpeciesPresenceNotesImagesAgnosphitysNicholas C. Fraser, Kevin Padian, Gordon M. Walkden and A. L. M. Davis, 2002. Basal dinosauriform remains from Britain and the diagnosis of the Dinosauria. Palaeontology. 45(1), 79-95.A. cromhallensisGeographically present in Avon, England (now Bristol).Its remains include a left ilium (holotype) and a left maxilla, astragalus and humerus (referred specimen). AgrosaurusA. macgillivrayiH. G. Seeley. (1891). On Agrosaurus macgillivrayi (Seeley), a saurischian reptile from the N.E. coast of Australia. Quarterly Journal of the Geological Society of London 47:164-165Geographically present in Avon, England (now Bristol). Originally believed to have been found in Cape York Peninsula, Queensland (Australia).A tibia, a claw and some other fragments. AsylosaurusA. yalensisGeographically present in Avon, England (now Bristol).Riley H and Stutchbury S (1836a) "A description of various remains of three distinct saurian animals discovered in the autumn of 1834, in the Magnesian Conglomerate on Durdham Down, near Bristol". Geological Society of London, Proceedings, 2 (45): 397-399.Dorsal vertebrae, ribs, gastralia, a shoulder girdle, humeri, a partial forearm, and a hand; additional bones from the neck, tail, pelvis, arm and legs that may represent the same individual.ChimaeriformesIndeterminateGeographically present in Bristol.Indeterminate remains.ClevosaurusW. E. Swinton. (1939). A new Triassic rhynchocephalian from Gloucestershire. Annals and Magazine of Natural History: Zoology, Botany, and Geology 4:591-59C. hudsoniGeographically present in Gloucestershire.Partial cranial and post-cranial skeleton (holotype).CrinoideaIndeterminateGeographically present in Bristol.Reworked from older Carboniferous sediments (Friars Point Limestone Formation).DiphydontosaurusD. avonensisGeographically present in Bristol.Complete to near-complete specimens.Hybodontiformes?IndeterminateGeographically present in Bristol.Indeterminate remains.GyrolepisIndeterminateGeographically present in Bristol.Indeterminate remains.LissodusL. minimusGeographically present in Bristol.Teeth.PalaeosaurusGalton, Peter (2007). "Notes on the remains of archosaurian reptiles, mostly basal sauropodomorph dinosaurs, from the 1834 fissure fill (Rhaetian, Upper Triassic) at Clifton in Bristol, southwest England". Revue de Paléobiologie. 26 (2): 505–591.P. cylindrodonGeographically present in Avon, England (now Bristol) and Bristol. Two teeth (one destroyed in 1940).PlanocephalosaurusP. robinsonaeGeographically present in Bristol.Skull (holotype).RhomphaiodonR. minorGeographically present in Bristol.Teeth.Rileyasuchusvon Huene, F. (1902). Überischt über die Reptilien der Trias. Geologische und Paläontologie Abhandlungen, Neu Folge 8:97-156. [German]R. bristolensisKuhn, O. (1961). Die Familien der rezenten und fossilen Amphibien und Reptilien. Meisenbach:Bamberg, 79 p.Geographically present in Bristol.Two vertebrae and a humerus. Terrestrisuchus?IndeterminateGeographically present in Bristol and South Wales.Indeterminate remains.TheropodaIndeterminateGeographically present in Avon, England (now Bristol) and Bristol. Indeterminate remains. Possibly similar to Pendraig milnerae.ThecodontosaurusT. antiquusGeographically present in Avon, England (now Bristol) and Bristol.Partial cranial and postcranial remains (holotype is a lower jaw).
References