J. Alroy, et al. 2008. Phanerozoic trends in the global diversity of marine invertebrates. Science 321:97-100.

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USGS D11967, Section 8 [Fort Hays Limestone Mbr, Niobrara Fm] - Rancho Bufalo section [Fronteros Mbr, Mural Fm] - Ba'id 270, Wadi Tayin - Ba'id 2, 3 km SW of village - Imsouane section, bed 72 [Taboulouart Fm] - Badahare Khola, Locality S1, Tansen Area - Babstovo, Lyudyanza Formation, Bolshie Churki range, Khabarovsk Region - Babai-Golyi Watershed, o.p. 179, Nel'koba River