The preserved remains or traces of an organism that lived in the past
gradual change of the original substances of an organism dissolve and are replaced by minerals from the water (turned to stone)
a type of fossil formed when a shell or other hard part of an organism dissolves, leaving an empty space in the shape of the part
A type of fossil that forms when a mold becomes filled in with minerals that then harden.
Thin object falls into sediment can leave an imprint when sediment hardens.
Formed when a dark sticky form of oil seep up from underground causing animals to get stuck
a type of fossil that provides evidence of the activities of ancient organisms
a vertebrate animal having four feet or legs or leglike appendages
scientist who studies fossils
to develop gradually by process of growth and change
term used to refer to two-footed locomotion
geologic time scale
scale used by paleontologists to represent evolutionary time
measurement of the amount of radioactive material (usually carbon 14) that an object contains
a heavy toxic silvery-white radioactive metallic element
The metal created from aged uranium
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