Asked by Trang Nguyen on May 19, 2024
Verified
Which of the following does NOT indicate that two terranes were already in contact by a certain time?
A) a sedimentary or volcanic unit of that age overlaps their mutual boundary
B) an intrusion invades both terranes or crosscuts their boundary
C) rock on both side shared the same deformation or metamorphic event
D) the two terranes have fossils of the same age that originated in different environments
Terranes
Distinct pieces of the crust that have been attached to a continent but originated elsewhere.
Sedimentary Unit
A sedimentary unit is a distinct layer of sedimentary rock with identifiable characteristics and depositional history, making it recognizable and distinguishable from other layers.
Intrusion
The forced entry of molten rock into or between other rock formations underground.
- Understand the process and indicators of terrane accretion and the evidence for such events in geological history.
Verified Answer
EM
Elizabeth McLindenMay 24, 2024
Final Answer :
D
Explanation :
The presence of fossils of the same age from different environments in two terranes does not necessarily indicate that the terranes were in contact; it could simply mean that similar life forms existed in both areas at the same time. The other options (A, B, C) directly suggest a physical connection or interaction between the terranes by the time those geological features formed.
Learning Objectives
- Understand the process and indicators of terrane accretion and the evidence for such events in geological history.