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The Smithian/Spathian boundary (late Early Triassic): a review of ammonoid, conodont, and carbon-isotopic criteria
; Zhang, L;
Orchard, M J; Brayard, A; Algeo, T J; Zhao, L S; Chen, Z Q; Lyu, Z Y. Earth-Science Reviews vol. 195, 2019 p. 7-36, https://doi.org/10.1016/j.earscirev.2019.02.014
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