UNIGE document Scientific Article
previous document  unige:28949  next document
add to browser collection
Title

The Hettangian corals of the Isle of Skye (Scotland): An opportunity to better understand the palaeoenvironmental conditions during the aftermath of the Triassic–Jurassic boundary crisis

Authors
Lathuilière, B.
Bartolini, A.
Published in Palaeogeography, Palaeoclimatology, Palaeoecology. 2013, vol. 376, p. 132-148
Abstract At Ob Lusa (Isle of Skye, Scotland), six distinct coral beds were observed in a modern outcrop where a Hettangian succession is exposed. The coral associations are monogenic, belonging to Lepidophyllia, a massive cerioid genus. The lowest bed has relatively well-developed colonies that form small bioconstructions, whereas the other beds have small and dispersed colonies that are completely drowned in the matrix. Their morphology and size can vary, but the general growth fabric is dominated by platy colonies. This type of growth fabric is defined as a platestone. The most surprising characteristic of these specimens, especially for the platy corals, is their growth pattern; many samples do not exhibit the classical growth polarity because they are bifacial. Geochemical analyses (δ180, δ13C) were conducted on oyster shells that were associated with the corals. The results indicate that the mean palaeotemperature was approximately 22 °C. Sedimentological analysis revealed shallow settings where the hydrodynamic energy and siliciclastic inputs fluctuated. The general faunal assemblage of the outcrop had low diversity and was mainly composed of allochthonous bioclasts. The corals at Ob Lusa clearly did not live under ideal environmental conditions for the development of corals.
Keywords HettangianCoralsPalaeoecologySedimentologyPalaeotemperaturesScotland
Identifiers
Full text
Structures
Research group Sedimentology, Biostratigraphy and Micropaleontology
Project FNS: 200021-130238
Citation
(ISO format)
GRETZ, Mélanie et al. The Hettangian corals of the Isle of Skye (Scotland): An opportunity to better understand the palaeoenvironmental conditions during the aftermath of the Triassic–Jurassic boundary crisis. In: Palaeogeography Palaeoclimatology Palaeoecology, 2013, vol. 376, p. 132-148. https://archive-ouverte.unige.ch/unige:28949

285 hits

1 download

Update

Deposited on : 2013-07-22

Export document
Format :
Citation style :