Index fossils are the remains of organisms that lived during a very specific and well-defined time span, and are able to be recognized from various, distant locations; hence, they are usually marine invertebrates like trilobites or ammonites. They are able to provide a means of dating fossils found with them or in layers above and below them.
paleontologist have discovered a fossil of a strange creature.
Ex: The paleontologist carefully brushed dust off of an ancient fossil.
This is called an index fossil.
the shape and size...
the shape and size...
It was a land plant.
Depending on the size of the fossil, anything from a micrometre to a metre.
All the sixth graders studied fossils.
Because they give us the best estimate of how old all the other fossils are in that sedimentary layer.
They are called index fossils.
The absolute age of the index fossil was determine by radioactive dating or another absolute method
hiii