Cryptic exposure horizons in the Carboniferous Limestone of Portishead, Avon

T. J. Faulkner, V. P. Wright, C. Peeters, L. Garvie

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Two unusual subaerial exposure horizons containing fibrous columnar calcite crystals are described from the (early Chadian) Lower Carboniferous of Portishead, near Bristol in southwest Britain. The lower horizon overlies the Courceyan Black Rock Limestone (mid‐ramp facies) and is separated from the upper horizon by the Sub‐Oolite Bed and is overlain by the Chadian Gully Oolite (both are inner ramp deposits). Regionally the Portishead Palaeosol Beds are interpreted as forming part of extensive emergent surfaces which developed along the southern margin of the Welsh–Brabant Massif. They correlate with similar subaerial exposure horizons in Belgium and southern Germany, and may be the product of a proposed major eustatic sea level fall at the end of the Courceyan.

Original languageEnglish (US)
Pages (from-to)1-17
Number of pages17
JournalGeological Journal
Issue number1
StatePublished - Jan 1 1990
Externally publishedYes


  • Dinantian
  • Eustacy
  • Fibrous columnar calcite
  • Palaeokarst
  • Speleothem

ASJC Scopus subject areas

  • Geology


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