Devonian and Carboniferous conodonts from the Kanthan Limestone, Peninsular Malaysia and their stratigraphic and tectonic implications

Abstract

Bedded pale-grey limestone, siliceous limestone and thinly interbedded dark-grey to black limestone and shale of the Kanthan Limestone have yielded Lower-Middle Devonian ('Polygnathus costatus patulus', Polygnathus costatus costatus' and 'Tortodus kockelianus' conodont Zones) and mixed Devonian and Carboniferous ('Scaliognathus anchoralis', 'Paragnathodus commutatus' and 'Gnathodus bilineatus' Zones with reworked Devonian conodonts) faunas. The presence of two disconformities in the sequence is revealed, separating Lower Middle Devonian from overlying Upper Tournaisiun (Tn3c, 'Scaliognathus anchoralis' Zone), and one separating the Upper Tournaisian (Tn3c) from the Lower Visean (Arundian-Brigantian 'Paragnathodus commutatus' and 'Gnathodus bilineatus' Zones). ... The conodonts also include tectonically folded elements and show textural alteration interpreted as due to regional metamorphism.