D. navicula-S. wilsoni Assoc., Lower Bringewood equivalents, east-central Wales (Silurian of the United Kingdom)

Where: England, United Kingdom (52.0° N, 3.0° W: paleocoordinates 27.9° S, 13.0° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Gorstian (427.4 - 425.6 Ma)

• Lower Bringewood equivalents (Atrypina Beds).

• formation-level stratigraphic resolution

Environment/lithology: marine; siltstone

• "Bottom currents led to improved water circulation and a better oxygenated sea bottom compared with the parallel laminated flags of the underlying Pterinea Beds. These irregularly laminated flags were deposited in quiet waters with a fairly low oxygen level but sufficient to support a low density and low diversity indigenous benthic fauna with individuals of small size. Teh facies position suggests a BA 4 assignment. Basin facies."
• "...irregularly laminated flags..."

Size class: macrofossils

Collection methods: Percent abundances are given, based on 17 samples.

Primary reference: J. D. Lawson. 1999. Atkins' Lower Bringewood associations of Wales and the Welsh Borderland. In A. J. Boucot and J. D. Lawson (eds.), Paleocommunities--a case study from the Silurian and Lower Devonian 380-387 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 23161: authorized by Michael Foote, entered by Michael Foote on 10.07.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Graptolithina
  -
Graptolithina indet.
Cephalopoda
 Nautiloidea -
Nautiloidea indet.
Nautiloidea indet. Agassiz 1847 nautiloid
orthocones
Bivalvia
 Ostreida - Pterineidae
Pterinea tenuistriata
Brachiopoda
  -
Brachiopoda indet.
Brachiopoda indet. Cuvier 1805
includes specimens assigned to ?Atrypina
Rhynchonellata
 Rhynchonellida - Hebetoechiidae
Sphaerirhynchia wilsoni
Sphaerirhynchia wilsoni de Sowerby 1816
 Rhynchonellida - Trigonirhynchiidae
Microsphaeridiorhynchus nucula
 Athyridida - Dayiidae
Dayia navicula
Dayia navicula Sowerby 1839
 Athyridida - Hyattidinidae
Hyattidina canalis
 Orthida - Dalmanellidae
Dalmanellidae indet.
Dalmanellidae indet. Schuchert 1913