Turbocheilus helicites Community in Wales and Welsh Borderland (Silurian of the United Kingdom)

Where: England, United Kingdom (52.0° N, 3.0° W: paleocoordinates 24.5° S, 12.0° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Platyschisma Shale Member (Downton Castle Formation), Pridoli (423.0 - 419.2 Ma)

• member-level stratigraphic resolution

Environment/lithology: marine; bioturbated, gray, calcareous siltstone and bioturbated, gray siltstone

• "BA 1 to high BA 2...A lagoonal environment suggested as the sequenced of deposits compares favorably with other described lagoon facies."
• "...best developed in dark-colored muddy siltstone facies of Platyschisma Shale Member, although it also occurs in light-colored muddy siltstone facies of the member, but less commonly. The [dark facies] comprises wavy-bedded, flaggy dark-gray siltstones, commonly calcareous and extensively bioturbated; preserved sed. structures include parallel- and ripple-laminations. the [light-gray facies] comprises wavy or lenticular bedded siltstones with parallel- and ripple-laminations, or they may be totally reworked, bioturbated. They show evidence of subaerial exposure in the form of desiccation cracks. Both facies assigned to restricted environment, probably lagoonal, within low salinity setting."

Size class: macrofossils

Collection methods: Abundances (present, common, fairly common, very common) are given.

Primary reference: K. E. S. Bradfield. 1999. Fossil communities of the late Ludlow and early Pridoli in Wales and the Welsh Borderland. In A. J. Boucot and J. D. Lawson (eds.), Paleocommunities--a case study from the Silurian and Lower Devonian 370-372 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 23108: authorized by Michael Foote, entered by Michael Foote on 09.07.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Loxonemidae indet., Thelodonta indet.
Loxonemidae indet.
loxonemid gastropods
Thelodonta indet.
thelodont denticles
Gastropoda
 Euomphalina - Anomphalidae
"Turbocheilus helicites" = Pycnomphalus helicites
"Turbocheilus helicites" = Pycnomphalus helicites de Sowerby and Murchison 1839 snail
Bivalvia
 Modiomorphida - Modiomorphidae
Modiolopsis complanatus
Ostracoda
 Podocopida -
Londinia fissurata, Frostiella groenvalliana
 Leperditicopida - Leperditiidae
Leperditia sp.
Leperditia sp. Rouault 1851 ostracod
unclassified
  -
Vertebrata indet.
Vertebrata indet. Lamarck 1801