Yaverland bed 38 (Cretaceous of the United Kingdom)

Where: England, United Kingdom (50.7° N, 1.1° W: paleocoordinates 40.9° N, 9.6° E)

• coordinate stated in text

• small collection-level geographic resolution

When: Wessex Formation (Wealden Group), Barremian (129.4 - 125.0 Ma)

• The entirety of the exposed Wessex Formation on the Isle of Wight is Barremian in age. Collected from close to the top of the formation

•Martill et al. 2020: At this locality gently dipping (~10) Lower Cretaceous strata of the Wealden Group comprising the upper part of the Wessex Formation and the overlying Vectis Formation form soft, slump-prone cliffs that are daily washed by the high tide.

• bed-level stratigraphic resolution

Environment/lithology: crevasse splay; muddy conglomerate

• Wessex Formation was "deposited in a meander-belt river system with a dominant flow direction from west to east"
• Bed 38 is a "plant debris bed". "The lower part of most plant debris beds comprises a poorly sorted, matrix-supported conglomerate. The upper part of most consists of structureless mudstone, which usually grades up into colour-mottled but predominantly red and purple floodplain mudstones." (Sweetman & Insole 2010 PPP 292:409)

Size classes: macrofossils, mesofossils

Collected by Sweetman

Collection methods: bulk, sieve,

• IWCMS: Isle of Wight County Museum Service

Primary reference: S. C. Sweetman and D. M. Martill. 2010. Pterosaurs of the Wessex Formation (Earl Cretaceous, Barremian) of the Isle of Wight, southern England: a review with new data. Journal of Iberian Geology 36(2):225-242 [R. Butler/R. Butler]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 101091: authorized by Richard Butler, entered by Richard Butler on 17.12.2010, edited by Roger Benson, Mark Bell and Grace Varnham

Creative Commons license: CC BY (attribution)

Taxonomic list

 Carcharhiniformes - Scyliorhinidae
Palaeoscyllium aff. formosum6 Wagner 1857 cat shark
BMNH P 66293–66295, 66298, 66299
 Theriamorpha - Spalacotheriidae
Yaverlestes gassoni n. gen. n. sp.3
Yaverlestes gassoni n. gen. n. sp.3 Sweetman 2008 mammal
Holotype mandible (BMNH M 45562) and BMNH M 45563 (a right m5)
 Multituberculata - Eobaataridae
? Loxaulax valdensis4 Woodward 1911 multituberculate
left I3 (BMNH M 45483)
Eobaatar clemensi4 Sweetman 2009 multituberculate
paratype, BMNH M 45557 (worn left m1 from which only part of the mesial root is missing), and tentatively referred specimen, BMNH M 45483 (left I3 crown and partial root)
 Eutriconodonta - Gobiconodontidae
? Gobiconodon sp.2 Trofimov 1978 mammal
BMNH M 45513, small, premolariform tooth
 Pterosauria -
? Pterosauria indet. Kaup 1834 pterosaur
IWCMS.2002.30, ungual phalanx
 Pterosauria - Tapejaridae
Wightia declivirostris n. gen. n. sp.1
Wightia declivirostris n. gen. n. sp.1 Martill et al. 2020 pterosaur
Holotype: IWCMS. 2020. 401 (maxilla fragment)
 Pterosauria -
Istiodactylus latidens Seeley 1901 pterosaur
IWCMS.2002.25, 2009.474-475, teeth
 Pterosauria - Istiodactylidae
Istiodactylidae indet. Howse et al. 2001 pterosaur
IWCMS.2009.476, tooth
 Temnospondyli - Albanerpetontidae
Wesserpeton evansae n. gen. n. sp.5
Wesserpeton evansae n. gen. n. sp.5 Sweetman and Gardner 2013 tetrapod
The holotype, BMNH R36521 (substantially complete fused frontals) and referred specimens: R36522–36568 and R36595–36611