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Pyrite disks or spindles are sometimes mistaken for fossils of sand dollars or other forms (see marcasite).Cracks, bumps, gas bubbles, and such can be difficult to distinguish from true fossils.
An example of a pseudofossil: Manganese dendrites on a limestone bedding plane from Solnhofen, Germany; scale in mm Main article: Pseudofossils Pseudofossils are visual patterns in rocks that are produced by geologic processes rather than biologic processes.
The term dubiofossil is a portmanteau word used in geology and paleontology for a problematic structure that looks like a fossil but has an uncertain biologic origin. From Latin dubius, and English fossil, the word has been used mainly for remains found in rocks dating from the early history of the Earth (Precambrian rocks), but it is also applicable in other settings such as problematic ...
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Eozoön canadense (literally, "dawn animal of Canada") is a pseudofossil. John William Dawson described the banded structures of coarsely crystalline calcite and serpentine as a gigantic Foraminifera, which was thought to be the oldest known fossil (Dawson 1865).
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A bed of the formation northeast of Soccoro has the rare pseudofossil Astropolithon. This is not actually a product of living organisms, but is an unusual sedimentary structure formed by outgassing from sediments bound together by microbial mats.
Bilinichnus simplex is a trace fossil from the Ediacaran period which consists of two parallel ridges on sandstone bed sole which have been interpreted as trails of peristaltic locomotion of a unknown gastropod-like animal leaving these traces behind [1] [2] or as pseudofossil of some kind.