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Pseudofossils are inorganic objects, markings, or impressions that might be mistaken for fossils. Pseudofossils may be misleading, as some types of mineral deposits can mimic lifeforms by forming what appear to be highly detailed or organized structures. One common example is when manganese oxides crystallize with a characteristic treelike or dendritic pattern along a rock fracture. The formation of frost dendrites on a window is another common example of this crystal growth. Concretions are sometimes thought to be fossils, and occasionally one contains a fossil, but are generally not fossils themselves. Chert or flint nodules in limestone can often take forms that resemble fossils.

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. Specimens which cannot be attributed with certainty to either the fossils or the pseudofossils are treated as dubiofossils. Debates about whether specific forms are pseudo or true fossils can be lengthy and difficult. For example, Eozoön is a complex laminated form of interlayered calcite and serpentine originally found in Precambrian metamorphosed limestones (marbles). It was at first thought to be the remains of a giant fossil protozoan (Dawson, 1865), then being by far the oldest fossil known. Similar structures were subsequently found in metamorphosed limestone blocks ejected during an eruption of Mt. Vesuvius. It was clear that high-temperature physical and chemical processes were responsible for the formation of Eozoön in the carbonate rock (O'Brien, 1970). The debate over the interpretation of Eozoon was a significant episode in the history of paleontology (Adelman, 2007).

Calcedonio opaco con inclusioni dendritiche?

Non è quarzo e non sono pseudofossili...

Una felce fossilizzata nel periodo carbonifero

Non sono felci del carbonifero.

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Se non felce allora alga fossilizzata......Hygrophyla difformis, periodo circa 40 milioni di anni fa.

E' un'alga, ma sulla Hygrophyla difformis ho qualche dubbio. E' un fossile inglobato nel calcare, in una pietra sedimentaria e stratificata proveniente dalla zona geologica ligure. Tagliata e usata a casa mia come pavimento esterno.

Bel pavimento Fabio, complimenti
sulla Hygrophyla difformis anche io ho qualche dubbio dato che e' una piantina che si usa ancora adesso per decorare gli acquari ed e' d'acqua dolce
Forse un'alga molto simile e sua "ava"

E' bellissima, ma mi dispiace che si stia usando per un pavimento, quindi da calpestare, per esterno addirittura.
Io l'avrei usata per rivestire un muro magari in un bagno.

Sono evidenze fossili visibili solo in pochissime lastre, forse soltanto dove il taglio ha coinciso con lo strato fossile.