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When a plant or animal is coverd by layers of sediment. After the sediment turns into rock, a hollow space is left in the rock.
CAST
PETRIFIED FOSSIL
MOLD
Trilobite
Clams
IMPRINT
A snail
An animal that looks like a plant.
Tracks or plant parts left in the mud that hardens into rock.
CAST
PETRIFIED FOSSIL
MOLD
Trilobite
Clams
IMPRINT
A snail
An animal that looks like a plant.
What is one Missouri fossil that proves that Missouri was coverd by an ocean millions of years ago?
CAST
PETRIFIED FOSSIL
MOLD
Trilobite
Clams
IMPRINT
A snail
An animal that looks like a plant.
Bi-Valve Fossils are similar to these creatures.
CAST
PETRIFIED FOSSIL
MOLD
Trilobite
Clams
IMPRINT
A snail
An animal that looks like a plant.
What is a gastropod similar to?
CAST
PETRIFIED FOSSIL
MOLD
Trilobite
Clams
IMPRINT
A snail
An animal that looks like a plant.
Describe a crinoid.
CAST
PETRIFIED FOSSIL
MOLD
Trilobite
Clams
IMPRINT
A snail
An animal that looks like a plant.
Minerals in the groundwater slowly fill in or replace bones or parts of a plant.
CAST
PETRIFIED FOSSIL
MOLD
Trilobite
Clams
IMPRINT
A snail
An animal that looks like a plant.
This type of fossil starts as a mold, but sediment seeps in and fills the space in the mold.
CAST
PETRIFIED FOSSIL
MOLD
Trilobite
Clams
IMPRINT
A snail
An animal that looks like a plant.
Check it!