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A mould fossil is created when a shell or other structure is buried in sediment and then dissolved by underground water, leaving a hollow imprint.

Cast fossils form when sediment fills the mold of an organism and then solidifies, creating a replica of the organism.

Trace fossils capture the activities of past organisms, such as footprints, burrows, and fecal matter.

Amber fossils are created when organisms are trapped in tree resin that hardens into amber over time.

Petrified fossils form when minerals replace the organic material of a dead organism, turning it into stone.

A carbon film fossil contains the carbon residue of an organism, often as a thin film that reveals delicate details of the specimen.

Permineralized fossils occur when mineral-rich water permeates the pores of organic material and solidifies, preserving the material.

True form fossils are actual remains of the organism's body parts, such as bones, teeth, and claws.

Microfossils are very tiny fossils, often of single-celled organisms, that can be seen only with a microscope.