You find a different rock with some kind of trilobite and an ammonoid. During
which period could this rock have formed? Explain.
Question 2
2.
Identify the coral index fossil that would most likely be found in the same
layer as the index fossil Ctenocrinus.
Question 3
3.
Each index fossil existed for a relatively short geologic time interval. State
one other characteristic that each fossil must have to be considered an index
fossil.
Question 4
4.
Question 5
5.
Question 6
6.
Question 7
7.
Question 8
8.
Question 9
9.
Question 10
10.
Fossils of Brachiopods, Trilobites, and Placoderm fish are found in the same
bedrock layer in New York State. Name one period in which this bedrock layer
could have formed.
Question 11
11.
Question 12
12.
How did this rock form? (Use The Rock Cycle if you can’t remember!)
Look at the image above. Both organisms that formed the fossils found in rock
layers 3 and 4
lived during the same period of geologic time
lived in polar regions
are members of the same group of organisms
are still alive today
Look at the image above. Evidence best indicates that rock layers 4 and 8 were
deposited during the same geologic period because both layers
contain the same index fossil
are composed of glacial sediments
contain index fossils of the same age
are found in the same area
Look at the image above. Three rock layers formed during the Silurian Period.
Which fossil might be found in these rock layers?
1
2
3
4
Fossils of trilobites, graptolites, and eurypterids are found in the same
bedrock layer in New York State. During which geologic time interval could this
bedrock layer have formed?
Late Ordovician to Early Devonian
Late Silurian to Early Cretaceous
Early Permian to Late Jurassic
Early Cambrian to Middle Ordovician
Which statement can best be supported by the fossil record?
Humans have lived on Earth throughout geologic history.
The organisms on Earth have not changed
Most life-forms that existed on Earth have become extinct
Dinosaurs existed on Earth for more than 544 million years
According to the fossil evidence which sequence shows the order in which these
four life-forms first appeared on Earth? (Use “Life on Earth” column)
reptiles → amphibians → insects → fish
insects → fish → reptiles → amphibians
amphibians → reptiles → fish → insects
fish → insects → amphibians → reptiles
You find the fossil (right) in the bedrock of New York State. In what type of
rock was it likely found?
