Robuta

https://palass.org/publications/palaeontology-journal/archive/37/1/article_pp61-70 Cephalaspids from the Lower Devonian of Prince of Wales Island, Canada | The Palaeontological... from the lower devonian prince wales cephalaspids island https://palass.org/publications/special-papers-palaeontology/archive/12/article_pp291-304 Brachipod distributions and the faunal provinces in the Silurian and Lower Devonian | The... lower devonian brachipod distributions faunal provinces https://experts.nau.edu/en/publications/a-new-agnathan-from-the-lower-devonian-of-arctic-canada-and-a-rev/ A new agnathan from the Lower Devonian of Arctic Canada, and a review of the tessellated... a new from the lower devonian arctic canada agnathan https://scholarworks.uni.edu/pias/vol71/iss1/49/ "Upper Devonian and Lower Mississippian Conodont faunas, north-central " by Wayne I. Anderson Conodonts are rare in the Shell Rock Formation, but they support the previous assignment of this formation to the lower part of the Upper Devonian. Conodont... upper devonian lower mississippian north central conodont faunas