Chapter 29/30 Study Guide
Marine
invertebrates
Archean
Is younger than
the rock it cuts
through
Dakota
Sandstone
Dinosaur
footprint
2 half-lives
correlation
Original remains
Fossil evidence
Embedded
fragments
mold
Asteroid
impacting Earth
Replaced
remains (2 times)
Large space
object hitting
Earth
Permian
superposition
50 percent
1. Older rocks contained within newer rocks are called ____________________________
2. The statement that the oldest layer will be at the bottom in an undisturbed sequence of
sedimentary strata is called the Principle of _________________________________
3. The principle of cross-cutting relationship states that an igneous intrusion is
__________________________
4. Fossils formed when the soft parts of an organism decayed and the hard parts were
replaced by minerals are called ___________________________
5. An example of a trace fossil is ____________________________
6. A cast can form only after the formation of a(n) _________________________
7. Petrified wood is a good example of what type of fossil? _________________________
8. The matching of rock layers from one area to another is called _____________________
9. Specterium-35 has a half-life of about 10 days. If a sample that originally contained 100
grams of Specterium-35 now contains only 25 grams, the sample has gone through
_________________________________________ half-lives.
10. A woolly mammoth found in the permafrost (permanently frozen, icey ground) of Siberia
is an example of a(n) _____________________________________
11. The oldest eon of geologic time is the ______________________
12. The divisions of the geologic timetable are based upon __________________________
13. The organisms most affected by the extinctions at the end of the Paleozoic Era were the
___________________________
14. The site famous for its abundant Jurassic dinosaur remains is known as the
_________________________
15. Approximately what percentage of plant and animal groups do scientists think became
extinct at the end of the Mesozoic Era? ___________________________________
16. During which period would you not expect to find dinosaurs roaming Earth?
________________________
17. The hypothesis for the cause of dinosaur’s extinction that has the most scientific support
links their extinction to ________________________________
18. Most modern geologists have argued that a global catastrophe may have caused the
extinction of the dinosaurs. According to these scientists, what was this catastrophe?
____________________________________
****There are 12 more questions on the test that are not on this study guide. Those questions
require you to read a graph or chart in order to answer the question. *******