It is such a nice day. I think I'll take a walk over to that small lake over there.
Hey brother lets go drown this tortoise
Now that the tortoise is dead, it will slowly become covered in sediment over many years and the soft parts of his body will disintegrate over time and his bones will become a fossil and an imprint will be set and filled to create a mold of the tortoise fossil.
Here is where the tortoise was buried in sediment and fossilized. Overtime the water moved and the tortoise was found closer to the moutains.
Millions of years later...
Look! A tortoise fossil!!
Wow! This tortoise fossil is 90 million years old!