Writers : Ashuri,A.
Refference : Geosciences Scientific Quarterly Journal,No.:25-26,P.:10
Publishing Year : 1376

Abstract :
Conodonts of Cephalopod Bed of Shishtu Formation in its reference section in Howz-e-Dorah, south of Shotori Range, has been studied. The Cephalopod Bed, mainly consists of red oolittic limestone and shale which has a rich macrofossil fauna of cephalopoda, brachiopoda, corals and also a good fauna of conodonts.
Conodont study reveals an age of Late Frasnian to Late Famennian for the Cephalopod Bed. A condont zone in the Late Frasnian (gigas) and conodont zones in Famennian (Pa/matolepis triangu/aris, rhomboidea and expansus) also have been introduced.
The previous studies indicated Devonian - Carboniferous boundary in a succession of 82 meters thick, which is overlain the Cephalopod Bed (Stocklin et al. 1965 and Stepanov, 1971). In this study the succession which contains Devonian- Carboniferous boundary reduced to 10 meters.
In Carboniferous conodont fauna the conodont zone o.f anchora/is- latus has been introduced.
Subject List : Conodont