Robuta

https://www.journals.pan.pl/dlibra/publication/143599/edition/127712/content Coexistence of algae and a graptolite-like problematicum: a case study from the late Silurian of... Polish Academy of Sciences case study from the coexistence algae graptolite https://www.cambridge.org/core/journals/geological-magazine/article/abs/graptolite-biozone-correlation-charts/A5B9788CAB281811BB73F121F3874940 Graptolite biozone correlation charts | Geological Magazine | Cambridge Core Graptolite biozone correlation charts - Volume 149 Issue 1 cambridge core graptolite correlation charts geological https://palass.org/publications/palaeontology-journal/archive/53/1/article_pp59-75?view=abstract The Upper Tremadocian (Ordovician) graptolite Bryograptus: taxonomy, biostratigraphy and... upper ordovician graptolite taxonomy biostratigraphy