Biota and palaeoenvironment of a high middle-latitude Late Triassic peat-forming ecosystem from Hopen, Svalbard archipelago

TitreBiota and palaeoenvironment of a high middle-latitude Late Triassic peat-forming ecosystem from Hopen, Svalbard archipelago
Type de publicationArticle de revue
AuteurMcLoughlin, S., Strullu-Derrien, Christine
EditeurGeological Society
TypeArticle scientifique dans une revue à comité de lecture
Année2015
LangueAnglais
Date23 Déc. 2015
Numéro1
Pagination87-112
Volume434
Titre de la revueGeological Society, London, Special Publications
ISSN0305-8719
Résumé en anglais

A siliceous permineralized peat block recovered from Hopen in the Svalbard archipelago hosts a low-diversity Late Triassic flora dominated by autochthonous roots and stems of bennettitaleans and lycophytes, and parautochthonous leaves, sporangia, spores and pollen from a small range of pteridophytes and gymnosperms. Some parenchymatous bennettitalean root cells show interactions with chytrid fungi and bacteria; the remains of other fungi and fungi-like organisms are dispersed within the peat's detrital matrix. Cavities excavated through some roots and compacted detritus contain abundant coprolites probably derived from sapro-xylophagous oribatid mites, although no body fossils have yet been identified. Sparse larger coprolites containing leaf fragments attest to the presence of invertebrate folivores in the ancient ecosystem. The low-diversity flora, relatively few trophic levels and simple nutritional web, together with sedimentological aspects of the host formation and the peat structure, collectively favour accumulation of the organic mass as a fibric (root-dominated) peat within a temperate (high middle-latitude), well-aerated mire.

URL de la noticehttp://okina.univ-angers.fr/publications/ua18616
DOI10.1144/SP434.4
Lien vers le document

http://sp.lyellcollection.org/content/434/1/87

Titre abrégéGeological Society, London, Special Publications