Nimbia occurs in numerous locations across a large range of time, which lends weight to theories that the fossil does not represent a single animal species. It occurs in the Twitya formation in the Mackenzie Mountains in Canada dated at 610 million years ago, near the end of the Marinoan glaciation, and in 770 million years ago rocks in Kazakhstan. Aspidella also appears in these areas. Morania and Beltina carbonaceous film fossils in the Twitya formation are not considered to be animals. Nimbia-like fossils have also been found in the Cambrian period.