PBDB Collection

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

Show authors, comments, and common names

Mammalia
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, Eobaatar clemensi⁴ ? 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 ? Gobiconodon sp.² Trofimov 1978 mammal BMNH M 45513, small, premolariform tooth
Reptilia
Pterosauria -	? Pterosauria indet. ? 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 - Istiodactylidae	Istiodactylidae indet. Istiodactylidae indet. Howse et al. 2001 pterosaur IWCMS.2009.476, tooth
Pterosauria -	Istiodactylus latidens Istiodactylus latidens Seeley 1901 pterosaur IWCMS.2002.25, 2009.474-475, teeth
Amphibia
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
Chondrichthyes
Carcharhiniformes - Scyliorhinidae	Palaeoscyllium aff. formosum⁶ Palaeoscyllium aff. formosum⁶ Wagner 1857 cat shark BMNH P 66293–66295, 66298, 66299

¹Martill et al. 2020; ²Sweetman 2006; ³Sweetman 2008; ⁴Sweetman 2009; ⁵Sweetman and Gardner 2013; ⁶Sweetman and Underwood 2006