Walton, west of Street (Jurassic of the United Kingdom)

Where: England, United Kingdom (51.1° N, 2.8° W: paleocoordinates 37.3° N, 1.2° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Pre-planorbis ammonoid zone, Blue Lias Formation (Lias Group), Early/Lower Hettangian (201.3 - 196.5 Ma)

• Earliest Hettangian (Benson et al. 2013)

• bed-level stratigraphic resolution

Environment/lithology: marine; lithology not reported

Size class: macrofossils

Reposited in the BMNH

Primary reference: T. Hawkins. 1834. Memoirs of Ichthyosauri and Plesiosauri, Extinct Monsters of the Ancient Earth vi-51 [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 110213: authorized by Matthew Carrano, entered by Hallie Street on 04.06.2011, edited by Matthew Carrano and Bethany Allen

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Sauropterygia - Pliosauridae
"Plesiosaurus hawkinsi" = Thalassiodracon hawkinsii2
"Plesiosaurus hawkinsi" = Thalassiodracon hawkinsii2 Owen 1840 plesiosaur
NHMUK 2021*
 Ichthyosauria - Ichthyosauridae
"Ichthyosaurus chiroparamekostinus" = Ichthyosaurus communis, "Ichthyosaurus chirostrongulostinus" = Ichthyosaurus tenuirostris, Ichthyosaurus larkini n. sp.1
"Ichthyosaurus chiroparamekostinus" = Ichthyosaurus communis Conybeare 1821 ichthyosaur
tail, paddle
"Ichthyosaurus chirostrongulostinus" = Ichthyosaurus tenuirostris Conybeare 1822 ichthyosaur
snout
Ichthyosaurus larkini n. sp.1 Lomax and Massare 2017 ichthyosaur
BRSUG 25300 (holotype), nearly complete skeleton, previously identified as I. communis