Upper Cambrian polymerid trilobites from the Machari Formation, Yongwol, Korea

This article deals with the systematic description of polymerid trilobites from the Upper Cambrian Eochuangia hana, Agnostotes orientalis, and Pseudoyuepingia asaphoides Zones of the Machari Formation, Konggiri section, Yongwol, Korea. Agnostoid trilobites from the same locality were reported in 2004. Described are 20 polymerid trilobite taxa, including two new genera (Joshuaspis and Macharia) and four new species (Metachangshania brachypyga, Proceratopyge promisca, Joshuaspis parvus, and Macharia pengi). While agnostoid trilobite assemblages were used for correlation with distant regions such as South China, Australia, Kazakhstan, Siberia, and Laurentia, these polymerid trilobite assemblages provide valuable information for correlation of the Machari Formation with the Furongian (Upper Cambrian) strata of North China. (c) 2008 Elsevier Masson SAS. All rights reserved.