foot prints and ammonites mainly, but any kind of organism if it had any contact with mud, under the right condition, it might just becomes a fossil
Full
mold
A fossil I pressume. . . Well the leaf is buried in some gloopy mud, and the mud drys around it making a cast / impression. The leaf rots a away after this because it is so fragile. The mud is lithified and bingo an impression. Am I barking up the right tree. . .
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Trace fossil
Sometimes a fossil is formed when the organic matter is impressed in clay or some similar substance. The organic substance rots away, but the impression it left remains, and if the clay which holds the impression petrifies, it becomes a fossil.
They are an example of a trace fossil
Yes.
A fossil created by a print or impression is called an imprint. The word "imprint" means to produce a mark a on a surface with the use of pressure.
This is called a trace fossil. or a mold.
Which principle is a geologist applying when deciding that a fossil in a mud layer is older than a fossil in a sandstone layer above it.
Mud was required.