Odhner (1930) and Hsü (1935) erroneously dated
the sediments of the Gongkang Formation as Pliocene.
They regarded the rich mollusc assemblage as closely
related to the superficially similar fauna of the former
Levantine Stage of Slavonia (Croatia, Bosnia, Serbia;
see Harzhauser & Mandic 2008 for discussion of the
viviparid fauna of Lake Slavonia), and thus determined
a Pliocene age. Today, the Nanning Basin is drained by
the Yong River, and is thus part of the southern catchment
area of the Pearl River.
The gastropod fauna that yielded the specimens described
herein was discovered in a construction trench
near the city of Santang, which is located ca 2 km to
the northeast of Nanning (Fig. 2A; N 22°52.47’, E
108°24.72’). The pit exposed a somewhat more than 6
m thick succession of the Gongkang Formation which
consisted of well-bedded mud- and siltstones of different
colours (Fig. 2B). The gastropods are derived from
different levels in the section (Fig. 2B), and the two
species detailed herein do not co-occur in the same
horizons.
Material and methods
Odhner (1930) and Hsü (1935) erroneously datedthe sediments of the Gongkang Formation as Pliocene.They regarded the rich mollusc assemblage as closelyrelated to the superficially similar fauna of the formerLevantine Stage of Slavonia (Croatia, Bosnia, Serbia;see Harzhauser & Mandic 2008 for discussion of theviviparid fauna of Lake Slavonia), and thus determineda Pliocene age. Today, the Nanning Basin is drained bythe Yong River, and is thus part of the southern catchmentarea of the Pearl River.The gastropod fauna that yielded the specimens describedherein was discovered in a construction trenchnear the city of Santang, which is located ca 2 km tothe northeast of Nanning (Fig. 2A; N 22°52.47’, E108°24.72’). The pit exposed a somewhat more than 6m thick succession of the Gongkang Formation whichconsisted of well-bedded mud- and siltstones of differentcolours (Fig. 2B). The gastropods are derived fromdifferent levels in the section (Fig. 2B), and the twospecies detailed herein do not co-occur in the samehorizons.Material and methods
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