Robuta

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 formation new insights silurian graptolite 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 ordovician of the middle conodont graptolite https://www.app.pan.pl/article/item/app08-103.html Le développement d'un graptolite Tuboide - Acta Palaeontologica Polonica acta palaeontologica polonica graptolite