Carbonaceous and siliceous Neoproterozoic vase-shaped microfossils (Urucum Formation, Brazil) and the question of early protistan biomineralization - Morais, Luana; Fairchild, Thomas R.; Lahr, Daniel J. G; Rudnitzki, Isaac Daniel; Schopf, J. William; Garcia, Amanda K.; Kudryavtsev, Anatoliy B.; Romero, Guilherme Raffaeli (Journal of Paleontology, 2017)