Vase-shaped microfossils (VSMs) discovered around the world show that amoebozoans have existed since the Neoproterozoic Era.
The rocks immediately surrounding Forest Falls are basement rocks characteristic of the major part of the San Bernardino Mountains, that is, Paleoproterozoic gneiss, Neoproterozoic to Paleozoic marble and quartzite, and Late Cretaceous granitic rocks.
The Iberian plate came into existence during the Cadomian Orogeny of the late Neoproterozoic, about 650-550 Ma, on the margin of the Gondwana continent, involving the collisions and accretion of the island arcs of the Central Iberian Plate, Ossa-Morena Plate, South Portuguese Plate.
He specializes in the Precambrian era and is widely known for the theory of the Snowball Earth about phenomena that occurred in the Neoproterozoic era, co-published with Daniel P. Schrag.