Oxroad Bay Exposure D (Carboniferous of the United Kingdom)

Where: Scotland, United Kingdom (56.0° N, 3.0° W: paleocoordinates 10.3° S, 1.7° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: CM palynozone zone, Sunnyside/Rhodes Limestone Member (Garlton Hills Volcanics Formation), Tournaisian (358.9 - 346.7 Ma)

• Occurs at the center of the most disrupted strata. Occupies a mini-graben bounded by two parallel SW-NE oriented faults. Sediments produce a pseudochannel. Grading is common.

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine - large; graded, bioturbated, pyritic, gray siltstone and graded sandstone

• A valuable analogue for these deposits is provided by the thicker, more extensive, and better-know Burdiehouse Limestone Fm...which were deposited in an extensive but shallow meromictic lake (Lake Cadell)...(Loftus 1985; Loftus & Greensmith 1988)
• Horizons vary greatly in degree of texture (siltstones to coarse lapilli tuffs) and degree of induration. In general the coarser and/or more calcareous horizons are more strongly indurated. Grading is common in coarser sections.Grading is common and most evident in the coarser horizons. Upward-fining horizons outnumber upward coarsening horizons, and flame structures occur at the top the coarse lapilli tuff of horizon 2.25. Two horizons near the base of the sequence (1.5 and 1.9) contain abundant in situ pteridosperm roots and can therefore be confidently described as paleosols. Two thick siltstone horizions...contain nodular calcareous concretions. The lower siltstone is a slightly darker grey and richer in pyrite than the upper...

Size class: macrofossils

Preservation: adpression, permineralized, charcoalification

Collection methods: surface (in situ), mechanical, peel or thin section,

• Occurence data are from reference #3954

Primary reference: R. M. Bateman and A.C. Scott. 1990. A reappraisal of the Dinantian floras at Oxroad Bay, East Lothian, Scotland. 2. Volcanicity, palaeoenvironments and palaeoecology. Transactions of the Royal Society of Edinburgh 81:161-194 [H. Sims/J. Allen/J. Cassara]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 10674: authorized by Hallie Sims, entered by Jonathan Allen on 11.06.2001

Creative Commons license: CC BY (attribution)

Taxonomic list

• Oxroadopteris parvus is described in Long 1984, and there is an a list of associated species at Oxroad Bay Locality E.
unclassified
  -
Lycopsida
  -
Lycopsida "Strobilus A"
strobilus with in situ mega- and microspores
 Coenopteridales -
Tantallosperma setigera
  -
Tantallosperma setigera Barnard and Long 1973
Bilignea solida
  -
Bilignea cf. solida Kidston 1923
Lyginorachis
  -
Sphaerostoma
  -
Telangium
  -
cf. Telangium sp. Benson 1904
Hydrasperma tenuis
  -
Salpingostoma dasu
  -
Salpingostoma dasu Gordon 1941
Stamnostoma
  -
Stamnostoma sp. Long 1960
 Cordaitales -
Amyelon spp. Williamson 1874
Ginkgoopsida
 Calamopityales - Calamopityaceae
Cladoxylopsida
 Pseudosporochnales -
Gymnospermopsida
  -
Oxroadia gracilis
  -
Oxroadia gracilis Alvin 1965