Furnish,W.M., Glenister,B.F., Nakazawa,K. & Kapoor,H.M (1973, p.188):

   Abstract.  Ammonoid cephalopods serve significantly as a basis for correlation
 of strata near the boundary between the Paleozoic and Mesozoic Erathems.  This
 is a report of the diagnostically Late Permian (uppermost Paleozoic) ammonoid
 Cyclolobus walkeri (Diener, 1903) from the Zewan Formation 20 meters below
 the Permian-Triassic contact at the classic section in Guryul Ravine, Srinagar
region, Kashmir.