Isle of Portland, Portland Stone (general) (Jurassic of the United Kingdom)

Also known as Portland Island

Where: England, United Kingdom (50.6° N, 2.4° W: paleocoordinates 41.3° N, 7.6° E)

• coordinate based on political unit

• small collection-level geographic resolution

When: Titanites anguiformis ammonoid zone, Portland Freestone Member (Portland Stone Formation), Late/Upper Tithonian (150.8 - 145.0 Ma)

• Titanites giganteus (=Titanites anguiformis) Zone; likely the Portland Freestone Member based on geography

• member-level stratigraphic resolution

Environment/lithology: marine; lithology not reported

Size class: macrofossils

Reposited in the BMNH

Collection methods: quarrying,

Primary reference: J. B. Delair. 1960. The Mesozoic reptiles of Dorset. Part two. Proceedings of the Dorset Natural History and Archaeological Society 80:52-90 [M. Carrano/M. Carrano/R. Benson]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 119505: authorized by Roger Benson, entered by Roger Benson on 29.10.2011, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)

Taxonomic list

 Testudines - Plesiochelyidae
Portlandemys sp.1, "Stegochelys planiceps" = Plesiochelys planiceps1
Portlandemys sp.1 Gaffney 1975 turtle
"Stegochelys planiceps" = Plesiochelys planiceps1 Owen 1842 turtle
OUM skull, BMNH bones
 Testudines - Pleurosternidae
Pleurosternum portlandicum1 Lydekker 1889 turtle
BMNH skull
 Saurischia -
Sauropoda indet.1 sauropod
PtM centrum and rib
Ornithopsis sp.1 Seeley 1870 sauropod
PtM tooth, BMNH tooth
 Loricata -
"? Crocodilia indet." = Crocodylia1
"? Crocodilia indet." = Crocodylia1 Owen 1842 crocodilian
PtM tooth
 Sauropterygia - Cryptoclididae
"Pliosaurus portlandicus n. sp." = Colymbosaurus trochanterius2, "Colymbosaurus ? portlandicus" = Colymbosaurus trochanterius, "Cryptocleidus aff. richardsoni" = Cryptoclidus richardsoni
"Pliosaurus portlandicus n. sp." = Colymbosaurus trochanterius2 Owen 1840 plesiosaur
BMNH 40640 (holotype: partial 'juvenile' right hindlimb)
"Colymbosaurus ? portlandicus" = Colymbosaurus trochanterius Owen 1840 plesiosaur
BMNH 41216 (caudal centrum), 41217 (left scapula and coracoid) first reported by Lydekker (1889, p. 169)
"Cryptocleidus aff. richardsoni" = Cryptoclidus richardsoni Lydekker 1889 plesiosaur
"Additional fragments very probably belonging to this species" (no detailed given)
 Sauropterygia -
Plesiosaurus megapleuron Owen 1854 plesiosaur
"Vertebrae and other bones...lowest beds of the Portlandian series" mentioned by Damon (1860, p. 82), but it is not clear what material he was referring to