the cover fossil
This is called a trace fossil. or a mold.
A fossil is any evidence of an organism preserved in rock.
Removing a fossil from rock is called fossil extraction or fossil preparation. This process requires delicate tools and techniques to carefully separate the fossil from the surrounding rock without damaging it.
This is called an index fossil.
Fossil fuels that can be obtained using current technology are called proven reserves.
Coal, methane gas, oil are fossil fuels; uranium is not a fossil fuel.
They are called petroleum.
Index Fossil
fossil
Fossil fuels.
paleontologists
an Ammonite