Name:_____________________ Class:_____________________
As you navigate through Geologic Time, keep your eyes open for answers to the following questions.
1. Find the book. Find any page in the book and describe what is happening there.
Answers will vary.
2. Find the word superposition. What does it mean?
Superposition refers to the fact that in a series of undisturbed rock layers the older layers will be on the bottom and the younger layers will be near the top.
3. Find the woman scientist. What is she studying? What will she learn?
The scientist is studying the chemical composition of the rocks to establish their numeric age.
4. Find the Jura Mountains. What country are they in and what period was named for them?
The Jura Mountains are located in Switzerland. The Jurassic Period, which spanned the period between 196-130 million years ago is named after them.
5. What do the periods on the geologic time scale represent?
Each period represents a change in the plants and animals of that time.
BONUS QUESTION: What is a eurypterid?
Eurypterids were one of the fiercest predators in ancient seas. Some reached more than two meters (six feet) in length, making them the largest arthropods that ever lived. The last ones went extinct about 245 million years ago.
SUPER BONUS: When did ammonites become extinct?
Ammonites were a type of chambered mollusk (similar to the living Nautilus) that went extinct at the same time as the dinosaurs, about sixty-five million years ago.