Westbury Formation

{{Infobox rockunit

| name = Westbury Formation

| image =

| caption =

| type = Geological formation

| age = {{fossilrange|Rhaetian|Rhaetian|latest=Hettangian|Rhaetian}}

| period = Rhaetian

| prilithology = Mudstone, Shale

| otherlithology = Limestone, Sandstone

| namedfor = Westbury-on-Severn

| namedby =

| region = Europe

| country = {{flag|UK}}

| coordinates =

| unitof = Penarth Group

| subunits =

| underlies = Lilstock Formation

| overlies = Blue Anchor Formation

| thickness = 5-10 m

| extent =

| area =

| map =

| map_caption =

}}

The Westbury Formation is a geological formation in England, one of the Penarth Group. It dates back to the Rhaetian.Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Triassic, Europe)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 521–525. {{ISBN|0-520-24209-2}}. The formation is named after the village of Westbury-on-Severn in Gloucestershire.[http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=WBY The BGS Lexicon of Named Rock Units — Result Details: Westbury Formation] The remains of a giant shastasaurid and dinosaurs are known from the formation.{{Cite journal|last1=Lomax|first1=Dean R.|last2=De la Salle|first2=Paul|last3=Massare|first3=Judy A.|last4=Gallois|first4=Ramues|date=2018-04-09|editor-last=Wong|editor-first=William Oki|title=A giant Late Triassic ichthyosaur from the UK and a reinterpretation of the Aust Cliff 'dinosaurian' bones|journal=PLOS ONE|language=en|volume=13|issue=4|pages=e0194742|doi=10.1371/journal.pone.0194742|issn=1932-6203|pmc=5890986|pmid=29630618|bibcode=2018PLoSO..1394742L|doi-access=free}}

Vertebrate fauna

class="wikitable" align="center" width="100%"
colspan="7" align="center" \|Vertebrates reported from the Westbury Formation
Genus ! Species ! Location ! Stratigraphic position ! Material ! Notes ! Images
AvalonianusH. G. Seeley. (1898). On large terrestrial saurians from the Rhaetic Beds of Wedmore Hill, described as Avalonia sanfordi and Picrodon herveyi. Geological Magazine, decade 4 5:1-6 \|A. sanfordi \|Wedmore Hill \| \|"Several now lost teeth." \| \|
Camelotia \| C. borealis \| Westbury-on-SevernGalton, P. M. (1985). Notes on the Melanorosauridae, a family of large prosauropod dinosaurs (Saurischia: Sauropodomorpha). Geobios, 18(5), 671–676. \| \| "Vertebrae, pubis, ischium, femur, tibia, phalanges, adult.""Table 12.1," in Weishampel, et al. (2004). Page 234. \| \|Image:Camelotia.jpg]]
Ichthyotitan{{Cite journal\|last1=Lomax \|first1=D. R. \|last2=de la Salle \|first2=P. \|last3=Perillo \|first3=M. \|last4=Reynolds \|first4=J. \|last5=Reynolds \|first5=R. \|last6=Waldron \|first6=J. F. \|title=The last giants: New evidence for giant Late Triassic (Rhaetian) ichthyosaurs from the UK \|year=2024 \|journal=PLOS ONE \|volume=19 \|issue=4 \|at=e0300289 \|doi=10.1371/journal.pone.0300289 \|doi-access=free \|pmc=11023487 }} \|I. severnensis \|Blue Anchor and Lilstock \| \|Two partial surangulars \|Possibly one of the largest marine reptiles \|
Picrodon \|P. herveyi \|Wedmore Hill \| \|"Tooth." \| \|
Shastasauridae \|Indeterminate \|Aust \| \|"Three partial specimens." \| \|
Pachystropheus{{Cite journal \|last=Quinn \|first=Jacob G. \|last2=Matheau-Raven \|first2=Evangelos R. \|last3=Whiteside \|first3=David I. \|last4=Marshall \|first4=John E. A. \|last5=Hutchinson \|first5=Deborah J. \|last6=Benton \|first6=Michael J. \|date=2024-06-04 \|title=The relationships and paleoecology of Pachystropheus rhaeticus , an enigmatic latest Triassic marine reptile (Diapsida: Thalattosauria) \|url=https://www.tandfonline.com/doi/full/10.1080/02724634.2024.2350408 \|journal=Journal of Vertebrate Paleontology \|language=en \|doi=10.1080/02724634.2024.2350408 \|issn=0272-4634\|doi-access=free }} \| \| \| \|Several partial postcranial skeletons \|A small thalattosaurian marine reptile, youngest known thalattosaur \|
Lissodus \|L. minimus \| \| \| \|A hybodont shark \|
Saurichthys \| \| \| \| \|A pike or gar-like predatory fish \|
Sargodon \| \| \| \| \|A dapediiform fish \|
Gyrolepis \| \| \| \| \|A ray-finned fish \|
Birgeria \| \| \| \| \|A large predatory fish \|File:BirgeriaDB15.jpg
Ceratodus \| \| \| \| \|A lungfish \|

class="wikitable" align="center" width="100%"

colspan="7" align="center" |Vertebrates reported from the Westbury Formation

Genus

! Species

! Location

! Stratigraphic position

! Material

! Notes

! Images

AvalonianusH. G. Seeley. (1898). On large terrestrial saurians from the Rhaetic Beds of Wedmore Hill, described as Avalonia sanfordi and Picrodon herveyi. Geological Magazine, decade 4 5:1-6

|A. sanfordi

|Wedmore Hill

|"Several now lost teeth."

Camelotia

C. borealis

| Westbury-on-SevernGalton, P. M. (1985). Notes on the Melanorosauridae, a family of large prosauropod dinosaurs (Saurischia: Sauropodomorpha). Geobios, 18(5), 671–676.

"Vertebrae, pubis, ischium, femur, tibia, phalanges, adult.""Table 12.1," in Weishampel, et al. (2004). Page 234.

|Image:Camelotia.jpg]]

Ichthyotitan{{Cite journal|last1=Lomax |first1=D. R. |last2=de la Salle |first2=P. |last3=Perillo |first3=M. |last4=Reynolds |first4=J. |last5=Reynolds |first5=R. |last6=Waldron |first6=J. F. |title=The last giants: New evidence for giant Late Triassic (Rhaetian) ichthyosaurs from the UK |year=2024 |journal=PLOS ONE |volume=19 |issue=4 |at=e0300289 |doi=10.1371/journal.pone.0300289 |doi-access=free |pmc=11023487 }}

|I. severnensis

|Blue Anchor and Lilstock

|Two partial surangulars

|Possibly one of the largest marine reptiles

Picrodon

|P. herveyi

|Wedmore Hill

|"Tooth."

Shastasauridae

|Indeterminate

|Aust

|"Three partial specimens."

Pachystropheus{{Cite journal |last=Quinn |first=Jacob G. |last2=Matheau-Raven |first2=Evangelos R. |last3=Whiteside |first3=David I. |last4=Marshall |first4=John E. A. |last5=Hutchinson |first5=Deborah J. |last6=Benton |first6=Michael J. |date=2024-06-04 |title=The relationships and paleoecology of Pachystropheus rhaeticus , an enigmatic latest Triassic marine reptile (Diapsida: Thalattosauria) |url=https://www.tandfonline.com/doi/full/10.1080/02724634.2024.2350408 |journal=Journal of Vertebrate Paleontology |language=en |doi=10.1080/02724634.2024.2350408 |issn=0272-4634|doi-access=free }}

|Several partial postcranial skeletons

|A small thalattosaurian marine reptile, youngest known thalattosaur

Lissodus

|L. minimus

|A hybodont shark

Saurichthys

|A pike or gar-like predatory fish

Sargodon

|A dapediiform fish

Gyrolepis

|A ray-finned fish

Birgeria