Microlestes Quarry, Frome: Rhaetian, United Kingdom
collected by C. Moore, W. Kühne 1860, 1939

List of taxa
Where & when
Taphonomy & methods
Metadata & references
Taxonomic list
Crocodilia indet. Owen 1842
Macfadyen 1970
    = Crocodylomorpha indet.
Mannion 2017
Chondrichthyes - Hybodontiformes - Pseudodalatiidae
Pseudodalatias sp. Reif 1978
Storrs 1994
Chondrichthyes - Hybodontiformes - Acrodontidae
Palaeobates sp.
Macfadyen 1970 2 specimens
CD18, M176
    = Palaeobates reticulatus n. sp. Duffin 1998
Duffin 1998
Chondrichthyes - Hybodontiformes - Polyacrodontidae
Hybodus cloacinus Quenstedt 1858
Macfadyen 1970
recombined as Polyacrodus cloacinus
Chondrichthyes - Hybodontiformes
Lissodus sp. Brough 1935
Storrs 1994
Acrodus minimus Agassiz 1839
Macfadyen 1970 45000 specimens
recombined as Lissodus minimus
Chondrichthyes - Lamniformes - Cetorhinidae
Pseudocetorhinus pickfordi n. gen., n. sp. Duffin 1998
Duffin 1998 12 specimens
CD23, 1997/1-11
Chondrichthyes - Synechodontiformes
Hybodus minor Agassiz 1837
Macfadyen 1970
recombined as Rhomphaiodon minor
Chondrichthyes - Synechodontiformes - Palaeospinacidae
Nemacanthus sp. Agassiz 1836
Storrs 1994
Palaeospinax rhaeticus Duffin 1982
Duffin 1982 5 specimens
recombined as Synechodus rhaeticus
CD19-20, M181a-c
Polyacrodus holwellensis n. sp. Duffin 1998
Duffin 1998 2 specimens
recombined as Duffinselache holwellensis
CD16, M181
Vallisia coppi Duffin 1982
Duffin 1982
recombined as Vallisodus coppi
Chondrichthyes - Chimaeriformes - Myriacanthidae
Agkistracanthus mitgelensis Duffin and Furrer 1981
Duffin 1994 6 specimens
M186, a-e
Reptilia - Procolophonidae
Procolophonidae indet. Lydekker 1889
Whiteside et al. 2016
Pachystropheus sp. von Huene 1935
Storrs 1994
Reptilia - Rhynchocephalia
Gephyrosaurus sp. Evans 1980
Whiteside et al. 2016
Gephyrosaurus evansae n. sp. Whiteside and Duffin 2017
Whiteside and Duffin 2017 1 specimen
Holotype: Specimen BATGM CD1: anterior and mid region of the lower part of a right maxilla displaying emplacements for 24 pleurodont teeth
Reptilia - Placodontia
Placodontia indet. (Cope 1871)
Macfadyen 1970
Reptilia - Trilophosauridae
Variodens sp. Robinson 1957
Whiteside et al. 2016
Variodens inopinatus Robinson 1957
Whiteside and Duffin 2017 1 specimen
Referred material: Specimen BATGM CD4, an anterior mid-region fragment of a left dentary
Palaeosaurus sp. Riley and Stutchbury 1836
Macfadyen 1970
nomen dubium belonging to Phytosauria
Thecodontosaurus sp. Riley and Stutchbury 1836
Macfadyen 1970
Microlestes sp. Plieninger 1847
Owen 1859 9 specimens
Bath Museum M211-M217, M222; YPM 13622A (molars)
    = Microlestes moorei n. sp. Owen 1871
Owen 1871
recombined as Thomasia moorei
Microcleptes sp. Simpson 1928
Simpson 1928 5 specimens
synonym of Thomasia
Bath Museum M218 (a canine/incisor), M220 (four canines/incisors)
Microcleptes fissurae n. sp. Simpson 1928
Simpson 1928 3 specimens
synonym of Thomasia antiqua
BMNH M2401A-C (molars)
Thomasia anglica n. sp. Simpson 1928
Simpson 1928 3 specimens
synonym of Thomasia antiqua
Bath Museum M219, M221; YPM 13622b (molars)
Morganucodonta - Morganucodontidae
Eozostrodon parvus n. gen., n. sp. Parrington 1941
Parrington 1941 1 specimen
Holwell IX
Eozostrodon problematicus n. sp. Parrington 1941
Parrington 1941 1 specimen
synonym of Eozostrodon parvus
Holwell XIII
Dipnoi - Ceratodontidae
Ceratodus sp. Agassiz 1838
Storrs 1994
Actinopteri - Semionotiformes - Semionotidae
Sargodon tomicus Plieninger 1847
Macfadyen 1970
Actinopteri - Perleidiformes - Colobodontidae
Colobodus sp. Agassiz 1843
Macfadyen 1970
Palaeonisciformes - Palaeoniscidae
Gyrolepis alberti (Agassiz 1834)
Macfadyen 1970
original and current combination Gyrolepis albertii
Palaeonisciformes - Birgeriidae
Birgeria sp. Stensiö 1919
Macfadyen 1970
Saurichthys acuminatus Agassiz 1843
Macfadyen 1970
recombined as Birgeria acuminata
Penegephyrosaurus curtiscoppi n. sp. Whiteside and Duffin 2017
Whiteside and Duffin 2017 1 specimen
Holotype: BATGM C193: a part of a left dentary with emplacements for five teeth
see common names

Country:United Kingdom State/province:England County:Somerset
Coordinates: 51.2° North, 2.4° West (view map)
Paleocoordinates:35.7° North, 1.1° East
Basis of coordinate:stated in text
Geographic resolution:outcrop
Period:Triassic Epoch:Late/Upper Triassic
Stage:Rhaetian 10 m.y. bin:Triassic 4
Key time interval:Rhaetian
Age range of interval:208.50000 - 201.30000 m.y. ago
Stratigraphic resolution:bed
Stratigraphy comments: Rhaetian fissure infill, "Lower Rhaetic"
Lithology and environment
Primary lithology:green lithified claystone
Secondary lithology: poorly lithified sandstone
Includes fossils?Y
Lithology description: "The filling may be a peculiar greenish clay, or hard clay with pebbles, etc., or friable sand."
Environment:fissure fill
Modes of preservation:body
Size of fossils:mesofossils,microfossils
Collection methods and comments
Collection methods:bulk,peel or thin section,sieve,survey of museum collection
Reason for describing collection:taxonomic analysis
Collectors:C. Moore, W. Kühne Collection dates:1860, 1939
Collection method comments: Moore collection at Bath Geology Museum.
Also known as:Holwell
Database number:120898
Authorizer:M. Clapham, R. Butler, R. Benson, M. Carrano, P. Mannion Enterer:M. Clapham, R. Benson, P. Vazquez, P. Mannion, M. Carrano, E. Dunne, R. Butler
Modifier:M. Carrano Research group:vertebrate
Created:2011-11-23 11:45:15 Last modified:2019-12-12 15:03:16
Access level:the public Released:2011-11-23 11:45:15
Creative Commons license:CC BY
Reference information

Primary reference:

29873. R. Owen. 1871. Monograph of the fossil Mammalia of the Mesozoic formations. 24(110):vi-115 [R. Butler/R. Butler/M. Carrano]

Secondary references:

38227 W. A. Clemens and Z. Kielan-Jaworowska. 1979. Multituberculata. In J. A. Lillegraven, Z. Kielan-Jaworowska, W. A. Clemens (eds.), Mesozoic Mammals: the first two-thirds of mammalian history 99-149 [R. Benson/R. Benson]
42437 G. Cuny and S. Risnes. 2005. The Enameloid Microstructure of the Teeth of Synechodontiform Sharks (Chondrichthyes: Neoselachii). PalArch 3(2):9-19 [M. Clapham/P. Vazquez/M. Clapham]
38111 C. J. Duffin. 1982. A palaeospinacid shark from the Upper Triassic of south-west England. Zoological Journal of the Linnean Society 74:1-7 [M. Carrano/M. Carrano]
38607 C. J. Duffin. 1982. Teeth of a new selachian from the Upper Triassic of England. Neues Jahrbuch für Geologie und Paläontologie, Monatshefte 1982(3):156-166 [M. Clapham/M. Clapham]
46012 C. J. Duffin. 1994. Myriacanthid holocephalans (Chondrichthyes) from the British Late Triassic. Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 192(1):1-16 [M. Clapham/P. Vazquez/M. Clapham]
44052 C. J. Duffin. 1998. New shark remains from the British Rhaetian (latest Triassic) 1. The earliest basking shark. Neues Jahrbuch für Geologie und Paläontologie Monatshefte 3:157-181 [M. Clapham/P. Vazquez]
44560 C. J. Duffin. 1998. New shark remains from the British Rhaetian (latest Triassic) 2. Hybodonts and palaeospinacids. Neues Jahrbuch für Geologie und Paläontologie, Monatshefte 1998(4):240-256 [M. Clapham/P. Vazquez/M. Clapham]
71227 F. v. Huene. 1940. Fossilium Catalogus. I: Animalia. Pars 93: Mammalia Triadica 1-13 [M. Carrano/M. Carrano/M. Carrano]
53178 W. A. Macfadyen. 1970. Geological Highlights of the West Country. A Nature Conservancy Handbook 1-296 [M. Carrano/M. Carrano/M. Carrano]
63504 P. D. Mannion. 2017. Personal opinions. [P. Mannion/P. Mannion]
16226 R. Owen. 1859. Palaeontology. The Encyclopaedia Brittanica, or Dictionary of Arts, Sciences, and General Literature (8th Edition) 17:91-176 [P. Wagner/P. Wagner/M. Carrano]
48742 F. R. Parrington. 1941. On two mammalian teeth from the Lower Rhaetic of Somerset. Journal of Natural History, series 11 8(44):140-144 [M. Carrano/M. Carrano]
12290 P. L. Robinson. 1957. The Mesozoic fissures of the Bristol Channel area and their vertebrate faunas. Zoological Journal of the Linnean Society 43:260-228 [R. Whatley/R. Whatley/R. Butler]
38748 G. G. Simpson. 1928. A Catalogue of the Mesozoic Mammalia in the Geological Department of the British Museum 1-215 [R. Benson/R. Benson/M. Uhen]
29868 G. W. Storrs. 1994. Fossil vertebrate faunas of the British Rhaetian (latest Triassic). Zoological Journal of the Linnean Society 112:217-259 [R. Butler/R. Butler/M. Carrano]
59609 D. I. Whiteside, C. J. Duffin, P. G. Gill, J. E. A. Marshall, and M. J. Benton. 2016. The Late Triassic and Early Jurassic fissure faunas from Bristol and South Wales: stratigraphy and setting. Palaeontologia Polonica 67:257-287 [M. Carrano/M. Carrano]
66019 D. I. Whiteside and C. J. Duffin. 2017. Late Triassic terrestrial microvertebrates from Charles Moore’s ‘Microlestes’ quarry, Holwell, Somerset, UK. Zoological Journal of the Linnean Society 179:677-705 [R. Butler/E. Dunne]