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Explanation:

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Residue is left on rocks when organisms decay

Explanation:

Fossils are remains of organisms that are found in rocks.

Carbon film fossils are basically residue of organic matter of organisms left behind when they decay.

Carbon films are usually found in sedimentary rock layers. They are usually formed through sedimentary processes.

When a sediment collects in a depositional basin, different plant and animal lives are embedded in it. As more sediments are brought to the basin, the overlying one compacts the sediments already in place.

For organisms that lacks skeletal parts, they leave behind organic molecules in them when they get compressed and compacted.

These organic molecules forms the carbon film molecules. The carbon film fossils have been found to be preserved for a long duration in the geologic history.

When an organism turns into rock, we call it pertrifaction.

When hollow forms are left in sediment by decaying organism they form materials suitable to get moulded when materials pour on them. Some fossils shows mould of the remains of decayed hard part of organisms.

Organisms that leave evidence of their activities, such as footprints on a rock strata must have perched on it while the sediments are still fresh and soft.

These are some of the processes that forms a fossil.