Petrified fossils Molds fossils Casts fossils Carbon films Preserved remains Trace fossils

Each the them form in different ways...

Petrified fossils: Fossils often kind when an organism’s remains come to be petrified, or “turned into stone.” In this process, mineral-rich water soaks right into the little cavities and pores that the initial organ- ism. The mineral precipitate indigenous the water and also fill the spaces.

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(https://sciencing.com/petrified-fossil-10017264.html)

Molds fossils:A fossil mold is produced when a covering or other structure is hidden in sediment and then dissolved by underground water. The mold reflects just the shape and surface markings of the organism. It doesn’t reveal any information about its interior structure.

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(https://www.sites.google.com/site/fossilfinding/types-of-fossils/mold-fossils)

Casts fossils: cast fossils are produced if the hole spaces the a mold are later filled through mineral matter.

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(https://www.reference.com/history/cast-fossil-370b9ab99347136d)

Carbon films:Fossils referred to as carbon movies can preserve fragile details of leaves and animal parts. The formation of a carbon film starts when an biology is hidden under good sediment. Over time, pressure squeezes out liquids and gases and leaves behind a slim film that carbon. Black color shale often includes carbon movie fossils. Sometimes, the carbon movie itself is lost from a fossil. However, an impression that the fossil may remain.

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(From Google Image)

Preserved remains:

Sometimes, fossilization preserves every or part of an organism with fairly little change. The mammoth frozen in permafrost is one example. Another example is insects kept in amber—the hardened resin, or sap, of old trees. The fly in figure 10E was kept after being trapped in a autumn of difficult resin. Fossils have the right to also kind when remains are maintained in tar. Tar is special petroleum that collects in pools at the surface. The La Brea Tar Pits in Los Angeles, California, have actually yielded preserved remains that ice-age mammals such together mastodons and sabre-toothed cats.

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(https://sciencing.com/preservedremains-fossil-formed-5799785.html)

Trace fossils:Trace fossils room indirect evidence of prehistoric life. Tracks, like the ones in the photo below, are animal footprints make of soft sediment the later changed to sedimentary rock. Burrows are holes do by an pet in sediment, wood, or rock the were later filled through mineral matter and preserved. Several of the oldest known fossils are believed to it is in worm burrows. Coprolites space fossils the dung and stomach con- tents. These deserve to often administer useful information concerning the food actions of organisms.


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Gastroliths are extremely polished stomach stones the were provided in the grind of food by part extinct reptiles.