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![]() Date: 2011-12-13 06:11:52Geologic time scale Richardoestesia Paronychodon Horseshoe Canyon Formation Hell Creek Formation Saurornitholestes Lance Formation Maastrichtian Aguja Formation Mesozoic Phanerozoic Coelurosaurs | Source URL: boletinsgm.igeolcu.unam.mxDownload Document from Source WebsiteShare Document on Facebook |