Alfaro, M. B., Uriz, N. J., Cingolani, C. A., Tortello, M. F., Bidone, A. R., Galeano Inchausti, J. C. (2013) Graptolites and trilobites from the Eusebio Ayala Formation (Hirnantian?-early Llandovery), Paraná Basin, eastern Paraguay. Geological Journal, 48 (2) 236-247 doi:10.1002/gj.2448

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