Discovery of a Lower Devonian Dacryoconarid bed from Hill B Guar Jentik, Perlis: Its significance and implications

Abstract

Abstract: A Lower Devonian dacryoconarid bed has been found in Hill B at Guar Jentik, Perlis. This fossiliferous bed stratigraphically overlies a biomicritic limestone lenticle, also known as the Sanai Limestone member, which is located at the lower part of Hill B. The Dacryoconarid bed contains Nowakia acuaria and Styliolina sp.. Monograptus sp. and Plectodonta forteyi were also found in this layer. The occurrence of Nowakia acuaria and Plectodonta forteyi in the dacryoconarid bed indicate a late Pragian to early Emsian age. Dacryoconarids are randomly oriented and abundant at the top of the limestone overlying the dacryoconarid bed. Dacryoconarids are very rare in the middle part of the limestone. This indicates that the limestone bed at Hill B is older than Pragian. It is probably the upper part of the Setul Formation. The Devonian sequence at Hill B, which is represented by thinly bedded mudstone and the dacryoconarid bed, suggests very slow deposition or non-deposition during Middle and Late Devonian.