Journal cover Journal topic
Journal of Micropalaeontology An open-access journal of The Micropalaeontological Society
Journal topic

Journal metrics

Journal metrics

  • IF value: 1.500 IF 1.500
  • IF 5-year value: 1.425 IF 5-year
    1.425
  • CiteScore value: 0.79 CiteScore
    0.79
  • SNIP value: 0.741 SNIP 0.741
  • IPP value: 1.45 IPP 1.45
  • SJR value: 0.577 SJR 0.577
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 24 Scimago H
    index 24
Volume 12, issue 1
J. Micropalaeontol., 12, 9–33, 1993
https://doi.org/10.1144/jm.12.1.9
© Author(s) 1993. This work is distributed under
the Creative Commons Attribution 4.0 License.
J. Micropalaeontol., 12, 9–33, 1993
https://doi.org/10.1144/jm.12.1.9
© Author(s) 1993. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Aug 1993

01 Aug 1993

Fusiline foraminiferal biostratigraphy and carbonate facies of the Permian Ratburi Limestone, Saraburi, central Thailand

O. Dawson O. Dawson
  • University of London, Department of Geology, Royal Holloway and Bedford New College, Egham, Surrey TW20 OEX

Abstract. A succession of Permian carbonates outcropping along the highway north of Saraburi, central Thailand, has yielded a prolific and diverse fusiline-algal assemblage of Early Permian (Sakmarian) to early Late Permian (Midian) age. Six major units representing dominantly carbonate platform environments are recognised: turbidite and basin slope deposits, a platform margin algal reef, a back reef, an interior platform with patch reefs, a protected lagoon inner platform, and supratidal, dolomitised algal mats. Archaeolithoporella and Tubiphytes form major reef frameworks analogous to those described from the Middle Permian reefs of Trogkofel (southern Austria) and El Capitan (western Texas). The associated dasycladacean floras are assignable to the Eastern Circum-Pacific Realm, whilst the fusiline fauna has Arctic-Tethyan affinities in the Early Permian and Tethyan affinities in the Middle Permian. Eight fusuline assemblage zones are recognised and the Robustoschwagerina-Nagatoella Zone, representing the Sakmarian (early Artinskian) stage, is recorded for the first time from central Thailand. Phylogenetic studies of the fusulines, coupled with an examination of the diagenetic fabrics and field observations, indicate the presence of an unconformity during the late Early Permian-early Middle Permian, which may be correlatable with a worldwide eustatic sea-level fall or may be due to local tectonic movements.

Publications Copernicus
Download
Citation