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Geologic Time Vocabulary

Across
What era was the "age of dinosaurs"?
What do you call the remains of an organism that is preserved in rock?
What do you call all time that has past on Earth?
What era was marked by an explosion of life in the sea?
Down
What is the oldest era in Earth's history?
What type of fossil can be used to determine an estimated age of a rock?
What era began after the dinosaurs went extinct?
What do you call it when a fossil leaves a 3D model of an organism?
What type of rock dating compares two different layers of rock to determine which one is older?
What do you call a space in a rock where a fossil has left an impression?