The location where Hadrosaurus was first found
UNIT 3
"GEOLOGY"
Grade 4: SOCIAL STUDIES:
STUDY GUIDES
1. Define the word "geology." (pages 54 - 55)
Geology is the science of the study of the earth's surface (crust).
2. What does the phrase "prehistoric" time mean? (pages 54
- 55)
Prehistoric times are the times before humans lived on the Earth.
3. Why are fossils important clues for learning about
the prehistoric world?
(pages 54 - 55)
Fossils preserve the remains of different types of plants and animals from
millions of years ago.
4. Is the region in which we live "sea bottom" or "ice
age" land? (pages 54 - 55)
Hunterdon County is in an area between where the glaciers ended and the sea
began.
5. Name two present-day features of New Jersey that were formed by prehistoric
geological forces. (pages 56 - 57)
The Delaware Water Gap was carved through the Kittitinnies.
The Watchung Mountains are cooled-off lava flows.
The Palisades along the Hudson are the remains of lava streams.
6. How do we know that dinosaurs once lived in New Jersey? (pages 58
- 59)
Fossilized dinosaur bones, footprints, and eggs have been found in New Jersey.
7. Who were "Hadrosaurus" and "Laelaps?"
Describe them. (pages 58 - 59)
Hadrosaurus: A 28 foot tall plant eating (herbivorous) dinosaur.
Laelaps: A 20 foot tall meat eating (carnivorous) dinosaur.
8. Why did the dinosaurs disappear? (pages 58 - 59)
Dinosaurs disappeared when their environment changed. The vegetation became
different, disease spread, and the climate became colder.
9. Long after dinosaurs became extinct, an elephant-like animal called the
mastodon roamed our state. (pages 58 - 59)
10. What is a "glacier?" (pages 60 - 61)
A glacier is a great, moving layer of ice (sometimes miles deep and thousands
of miles wide).
11. How were New Jersey's prehistoric lakes formed? (pages 60 - 61)
When "our" glacier finally began to melt, it released water that flowed
over the earth. The melting waters filled the valleys between the hills and
formed several very large lakes in northern New Jersey.
12. What feature of our state was left behind by Lake Hackensack?
(pages 60 - 61)
Lake Hackensack left behind the "Jersey Meadows"
13. Lake Passaic left us with the Passaic River and The
Great Swamp . (pages 60 - 61)
14. Give an example of present-day geological change. (pages 62 - 63)
Each day the ocean washes against the Jersey Shore, shifting the sands and changing
the coastline.
15. Can fossils of prehistoric animals still be found in New Jersey? (pages
62 - 63)
Yes, many discoveries have been in discovering bones, fossils, dinosaur footprints,
eggs, and animal descendants.
The location where Hadrosaurus
was first found
Hadrosaurus
Information
on Hadrosaurus foulkii
Hadrosaurus
More
Information on Hadrosaurus foulkii
Dryptosaurus
Information
on Dryptosaurus
Dryptosaur
Fact Sheet
Hadrosaurus and Dryptosaurus