Abstract.  Investigations of the Permian Triassic sections and limestone blocks scattered in the
Indus-Tsangbo Suture Zone in southern Tibet show widespread distribution of the Lopingian
strata.  The Lopingian deposits mostly contain rich brachiopod fossils and characteristic cono-
donts of the  Mesogondolella sheni Zone of latest Changhsingian age in the topmost part. Brachi-
opod assemblages are largely comparable with those known from the upper Wargal and Chhidru
Formations of the Salt Range, Pakistan, the Zewan Formation of Kashmir, the upper part of the
Kuling Group in Spiti of India and the Hardman Formation of Western Australia.  A revised
Lopingian (Late Permian) age is proposed for the Selong Group and its equivalents in southern
Tibet.
    The Lopingian deposits in southern Tibet can be grouped into three different sedimentary
types, each of which reflects different sedimentary environments from coastal to continental shel-
fal settings on the northern peri-Gondwanan margin.  The Qubu-type sequence represents marine
coastal and proximal barrier-lagoon sediments during a gradual sea-level rise.  Micaceous sand-
stone and shale of regressive origin, with abundant palynomorphs md acritarches, developed dur-
ing the Late Lopingian sea level lowstand, which is followed by a major rapid transgression at the
very end of Permian.  The Selong-type sequence in the Selong area consists of bioclastic limestone
and calcareous shale in the lower part, and crinoid grainstone in the upper part.  The latter part is
believed to have been formed in a high energy inner shelf shoal setting.  The Chitichun-type
sequence, sporadically distributed along the Indus-Tsangbo suture zone as small limestone blocks,
consists of pure bioclastic sparite with the ammonoid Cyclolobus fauna. It is interpreted as the
break-up products of sea mounts and/or small isolated carbonate build-ups developed on the
outer shelfal settings.