Significant Triassic clastic deposits with gypsum beds and volcanic clastics have been found between Xainza and Coqên. Early Devonian (Pragian-Emsian) rocks in Xainza County are said to "yield a shallow-marine, carbonate-platform fauna of corals, brachiopods, dacryoconarids, nautiloids and conodonts."
Sedimentary deposits rich in gypsum and volcanic materials have been found between Xainza and Coqên.  The Devonian rocks of Xainza County are characterized by a shallow-marine environment with fossils like corals, brachiopods, dacryoconarids, nautiloids, and conodonts.