Articles | Volume 20, issue 2
J. Micropalaeontol., 20, 155–168, 2001
https://doi.org/10.1144/jm.20.2.155
J. Micropalaeontol., 20, 155–168, 2001
https://doi.org/10.1144/jm.20.2.155

  01 Dec 2001

01 Dec 2001

Upper Triassic and Lower Jurassic stratigraphy from exploration well L134/5-1, offshore Inner Hebrides, west Scotland

Nigel R. Ainsworth1 and Ian Boomer2 Nigel R. Ainsworth and Ian Boomer
  • 139 De Tany Court, St Albans, Hertfordshire AL1 1TU, UK. ()
  • 2Department of Geography, University of Newcastle-upon-Tyne, Newcastle NE1 7RU, UK. ()

Abstract. A thick (c.1368 m) Upper Triassic to Lower Jurassic sedimentary sequence from exploration well L134/5-1, offshore Inner Hebrides, has yielded a rich and diverse foraminiferal and ostracod microfauna. Many of the taxa have been previously described throughout northwest Europe. Poor preservation (often due to crushing and/or overgrowth) and low numbers preclude a complete taxonomic review of this material, although changes in the faunal composition, rates of faunal turnover and palaeoenvironmental analyses are discussed. This is the first published account of ostracod and foraminiferal assemblages from the Sea of Hebrides and they indicate that the sediments (argillaceous, arenaceous and carbonates) were deposited in a shelf-marine setting with environmental fluctuations that are possibly the result of local relative sea-level changes.