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Biostratigraphy and paleobiogeography of Middle and Late Ordovician conodonts from the Langkawi Islands, northwestern peninsular Malaysia

Published online by Cambridge University Press:  14 July 2015

Sachiko Agematsu
Affiliation:
Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki, 305-8572, Japan,
Katsuo Sashida
Affiliation:
Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki, 305-8572, Japan,
Amnan B. Ibrahim
Affiliation:
Minerals and Geoscience Department, Sabah, Malaysia

Abstract

The Middle and Upper Ordovician sequence of the Langkawi Islands, northwestern peninsular Malaysia, contains 20 species of conodonts belonging to 15 genera and four unidentified species, which are described and illustrated. The following four biostratigraphic zones are established for the study area: the Scolopodus striatus assemblage zone, the Periodon sp. A range zone, the Baltoniodus alobatus range zone, and the Hamarodus europaeus range zone, in ascending order. The Middle Ordovician fauna belongs to the low-latitude, warm-water Australian Province. Conodonts of the H. europaeus zone represent the HDS (Hamarodus europaeus-Dapsilodus mutatus-Scabbardella altipes) biofacies, which has been reported from the cool-water North Atlantic Faunal Region. The middle Arenigian limestones in the study area were deposited on a shallow-water shelf, whereas the late Arenigian to middle Darriwilian limestones formed in hemipelagic deeper-water conditions on an outer shelf or slope.

Type
Research Article
Copyright
Copyright © The Paleontological Society 

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