Many people incorrectly think that a copy of a fossil is a 'mold'. But the real name for the copy of a fossil is a 'cast'.
Fossil
The answer is Mold
It is a cast fossil.
When a hard part of an organism buried in sediment dissolves an leaves an empty space it is called a mold.
It is conceivable that a fossil could be found among sedimentary rock crystals, and some dead organisms have actually been replaced by minerals which are composed of crystals. Fossils in gems and crystals from metamorphic or igneous processes--no.
The fossil that is formed when an organism is buried in sediment and hardens into rock is called a cast fossil, in which the empty space serves as a mold.
Resin pressed in sediment becomes what
Sediment and tree sap
Fossil
It gets buried in sediment
Fossil
First, a thin layer of sediment hardens and forms a mold. Then, what is known as a cast is when a new layer of sediment fills in the mold breaking down the creature/ animal/fossil.
No coral is NOT sediment. Coral SAND is a sediment but the coral itself is a living organism - if buried and lithified, the coral becomes a fossil.
Collection of a volume of fossil-laden rock or sediment for analysis of fossil content.
it probably died there as the sediment was beginning to compact and left a trace fossil
a footprint.
Trace Fossil