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Across
3.in layers of sedimentary rocks, the oldest layer is on the bottom and the youngest layer is on the top if the layers have not been overturned
6.remains of an orgasm preserved in the earth's crust
7.Era characterized by dinosaurs
8.replacement of the original parts of a buried organism with minerals
13.Outline of the events of the earth's history
14.awesome creatures of the sea
15.all time that has passed since the earth formed
17.Method that compares two rock layers to find out which is older
18.Era marked by great development in sea life
Down
1.a feature that cuts across rock layers is younger than the rock layers
2.the shape of a plant or animal left in a rock
4.Element that breaks apart, or decays, to form another element
5.Length of time it takes for half of the atoms of a radioactive element to decay
9.Method that determines the actual age of a rock or fossil
10.fossil that can be used to establish the relative age of the rock in which the fossil occurs
11.Oldest and longest era of earth's history
12.Era described as the age of mammals
16.model of an organism

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