https://palass.org/publications/palaeontology-journal/archive/21/4/article_pp723-758
Middle and Upper Ordovician conodont and graptolite biostratigraphy of the Marathon, Texas...
upper ordovicianof themiddleconodontgraptolite
https://www.andeangeology.cl/index.php/revista1/article/view/V50n2-3617/pdf
New insights on the Silurian graptolite biostratigraphy of the La Chilca Formation, Poblete Norte...
New insights on the Silurian graptolite biostratigraphy of the La Chilca Formation, Poblete Norte section, Central Precordillera of San Juan, Argentina: faunal...
la chilca formationnewinsightssiluriangraptolite
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Le développement d'un graptolite Tuboide - Acta Palaeontologica Polonica
acta palaeontologica polonicagraptolite