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A new, high-diversity, latest Ordovician brachiopod fauna of nearly 800 brachiopod specimens was collected from the Wanyaoshu Formation (Hirnantian) in the Shaodihe section, Mangshi City, western Yunnan, Southwest China. Altogether 22 genera and two undetermined taxa were identified; dominant are Aegiromena, Anisopleurella,

BaTaO 2 N with intense visible light absorption has been demonstrated as a promising photocatalyst for Z-scheme overall water splitting, whereas the photocatalytic activity of BaTaO 2 N is still restricted by strong charge recombination at structural defects. Here, we present the direct growth of BaTaO 2 N–BaNa 0.25 Ta 0.75 O 3 solid solution from a lattice-matched BaNa 0.25 Ta 0.75 O 3 precursor through volatilization of Na species during a nitridation process. This method promotes the direct phase transformation from BaNa 0.25 Ta 0.75 O 3 to BaTaO 2 N to inhibit the formation of defect states. As a result, the as-obtained BaTaO 2 N–BaNa 0.25 Ta 0.75 O 3 solid solution shows greatly enhanced activity compared to the conventional BaTaO 2 N, regardless of photocatalytic H 2 evolution in the presence of methanol or Z-scheme overall water splitting. This study provides a facile method to construct (oxy)nitride-based solid solution photocatalysts with low defect density for efficient solar hydrogen production from water splitting.