LATE DEVONIAN-TOURNAISIAN CONODONTS FROM THE EASTERN KHYBER REGION, NORTH-WEST PAKISTAN

Conodonts (62 species and subspecies) from acid-leaching of 226 sample s from four sections through the Ali Masjid Formation west of Misri Kh el in the former South Khyber Agency, north-west Pakistan, are documen ted by illustrations and distributional data. These indicate that most of this unit, at least in that area, spans the interval Middle crepid a Zone (low in the Famennian) to at least Early crenulata Zone (mid-To urnaisian), though a fauna from low in one of the sections produced co nodonts indicative of the Late falsiovalis Zone (early Frasnian). Two major hiatuses are inferred: between the Late falsiovalis and Middle c repida zones, and between the Late expansa and Early duplicata zones. Coherence of the conodont biostratigraphy accords with lithologic alig nments between the sections.