Vase-shaped microfossils (VSMs) discovered around the world show that amoebozoans have existed since the Neoproterozoic Era.
of pollen and other microfossils from a core sample taken in an intermontane valley of the Segura mountains in southern Spain finds P. prostrata in a "Prunus type" located in two radiocarbon-dated zones from about 2630 BP to about 1550 BP and again from about 790 BP to present.
Since 1997, Richard B. Hoover has published numerous papers in scientific conference proceedings and in peer-reviewed scientific journal articles and book chapters describing controversial evidence and claims for the existence of indigenous microfossils of cyanobacteria and other filamentous prokaryotes in the CI1 (Ivuna and Orgueil) and CM2 (Murchison and Murray) carbonaceous meteorites.