Upper Blaisdon Beds. May Hill inlier (Silurian of the United Kingdom)

Where: Wales, United Kingdom (52.0° N, 2.0° W: paleocoordinates 26.6° S, 12.0° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Upper Blaisdon Beds Formation, Ludlow (427.4 - 423.0 Ma)

• Listed as Middle Ludlow

• formation-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; poorly lithified, shelly/skeletal, calcareous siltstone

• Grayish olive, flaggy and shaly calcareous siltstones with frequent thin bands of shelly limestone

Size classes: macrofossils, mesofossils

Primary reference: J. D. Lawson. 1955. The geology of the May Hill Inlier. Quarterly Journal of the Geological Society of London 111:85-116 [P. Novack-Gottshall/P. Novack-Gottshall]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 74670: authorized by Phil Novack-Gottshall, entered by Phil Novack-Gottshall on 23.08.2007, edited by Paul Hearn

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Dayla navicula
"Present"
Gastropoda
 Murchisoniina - Phanerotrematidae
"Bembexia (Murchisonia) lloydi" = Ulrichospira lloydii
"Bembexia (Murchisonia) lloydi" = Ulrichospira lloydii de Sowerby and Murchison 1839 snail
"Present"
Bivalvia
 Ostreida - Pterineidae
Pterinea spp. Goldfuss 1832 oyster
"Present"
Pteronitella retroflexa oyster
"Present"
 Lucinida - Mactromyidae
 Modiomorphida - Modiomorphidae
"Goniophora cymbaeformis" = Goniophora (Goniophora) cymbaeformis
"Goniophora cymbaeformis" = Goniophora (Goniophora) cymbaeformis Sowerby 1839 clam
"Present"
 Modiomorphida - Allodesmatidae
 Cardiidia - Grammysiidae
Fuchsella (Orthonota) amygdalina Sowerby 1827 clam
"Fairly common"
 Solenida - Orthonotidae
Orthonota rigida clam
"Present"
Strophomenata
 Strophomenida - Chonetidae
 Strophomenida - Rafinesquinidae
Leptaena rhomboidalis Wahlenberg 1818
"Present"
 Strophomenida - Leptostrophiidae
"Leptostrophia filosa" = Mesoleptostrophia filosa
"Leptostrophia filosa" = Mesoleptostrophia filosa Sowerby 1839
"Fairly common"
 Strophomenida - Shaleriidae
"Shaleria (Brachyprion) ornatella" = Shaleria (Janiomya) ornatella
"Shaleria (Brachyprion) ornatella" = Shaleria (Janiomya) ornatella Davidson 1871
"Present"
Rhynchonellata
 Rhynchonellida - Trigonirhynchiidae
"Camarotoechia nucula" = Microsphaeridiorhynchus nucula
"Camarotoechia nucula" = Microsphaeridiorhynchus nucula Sowerby 1839
"Common"
 Rhynchonellida - Hebetoechiidae
Sphaerirhynchia (Wilsonia) wilsoni de Sowerby 1816
"Common"
 Orthida - Dalmanellidae
 Atrypida - Atrypidae
Atrypa reticularis Linnaeus 1758
"Common"
 Spiriferida - Delthyrididae
Delthyris elegans Muir-Wood 1925
"Present"
Delthyris elevata Dalman 1828
"Present"
 Athyridida - Rhynchospirinidae
"Rhynchospira sp." = Rhynchospirina
"Rhynchospira sp." = Rhynchospirina Schuchert and LeVene 1929
"Fairly common"
 Athyridida - Meristellidae
Whitfieldella canalis
"Fairly common"
Craniata
 Craniopsida - Craniopsidae
Lingulata
 Lingulida - Lingulidae
Lingula lewisii
"Fairly common"
 Lingulida - Discinidae
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831
"Polyzoan" "Fairly common"
Stenolaemata
 Trepostomida - Stenoporidae
Hyolitha
 Hyolithida - Hyolithidae
"Theca forbesi" = Hyolithes
"Theca forbesi" = Hyolithes
"Present"
Ostracoda
 Podocopida - Bythocyprididae
Bythocypris siliqua ostracod
"Fairly common"
Trilobita
 Phacopida - Calymenidae
Calymene intermedia trilobite
"Present"
Crinoidea
  -
Crinoidea indet. Miller 1821 Sea lily
"Present" [entered as Criniodea indet.]