A cast fossil is when an animal or plant is imprinted on a hardened substance. The actual plant or animal material is not present.
so far all i got is bones. can't think of anything else :(
plants, petrified wood , orgonisuns and shells
They are called index fossils.
index fossils
Index fossils can be used to help determine the relative age of rock layers. Index fossils are from species that only existed for a short time. Index fossils are found in rock layers. Trilobites and Graptolites are index fossils.
It is because the index fossils has better minds than the paleontologist.
An index fossil. An index fossil's age is known, allowing scientists to know the relative age of other fossils based on their position relative to the index fossil. (Ex. If a fossil is deeper in the earth, it is older than the index fossil)
trilobites
They are called index fossils.
The principles of horizontality, superposition; and index fossils.
index fossils
Index fossils can be used to help determine the relative age of rock layers. Index fossils are from species that only existed for a short time. Index fossils are found in rock layers. Trilobites and Graptolites are index fossils.
Index fossils can be used to help determine the relative age of rock layers. Index fossils are from species that only existed for a short time. Index fossils are found in rock layers. Trilobites and Graptolites are index fossils.
It is because the index fossils has better minds than the paleontologist.
Index fossils can be used to help determine the relative age of rock layers. Index fossils are from species that only existed for a short time. Index fossils are found in rock layers. Trilobites and Graptolites are index fossils.
They are called index fossils, an aid to relative dating of rock.
An index fossil. An index fossil's age is known, allowing scientists to know the relative age of other fossils based on their position relative to the index fossil. (Ex. If a fossil is deeper in the earth, it is older than the index fossil)
Trilobites were rapidly evolving and widespread organisms, making them ideal index fossils.
Index fossils