Andrade, Iman Week 9 Homework
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School
Central New Mexico Community College *
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Course
304
Subject
Geology
Date
Apr 3, 2024
Type
docx
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3
Uploaded by DoctorTitaniumRabbit39
Week 9 Problem Set Answer Sheet
8.2 A
– Cross Section 1 only (34 points; 2 points per blank)
Geologists like to list events from youngest at the top to oldest at the bottom
. I’ve always suspected that this has its roots in Superposition. If you look at a geologic map, the key or legend is always organized with the youngest rock units at the top and the oldest at the bottom.
Youngest
_
Newest F
__
_Unconfirmed R
__
_Sedimentary B
_
__Sedimentary K
_
__Sedimentary N
_
__Unconformity S
_
__Unconformity A
_
_Sedimentary J
__
_Sedimentary D
_Sedimentary_
M
_Unconformity O
__
_Fault H
__
_Sedimentary
C
_Sedimentary L
__
_Sedimentary G
__
_Unconformity P
Oldest
_Oldest E__
8.3
A (33 points total - 11 points each) ***You will need the file entitled (Geologic Time Scale (10
th
Edition) to determine “early, middle, and late” and numerical ages***
1. List the names of the two index fossils in the associated image (see Figure 8.13, p. 217)
Mucrospirnifer and Phacops
2. The overlap
in ranges of the index fossils indicates the age of the rock. Express that age in terms of the
period(s)
of the geologic time scale, using the modifiers (epochs) like “early, “middle”, or “late”
. Example: late Triassic to early Jurassic.
Late Silurian period to the late Devonian period.
3. The answer to ‘2’ above is an example of relative time. What is the numerical age
of this rock expressed as a range
in millions of years. You will need to use the Geologic Time Scale (10
th
edition) that is provided.
From around 425 million years to 359 million years ago
.
8.3
B (33 points total - 11 points each)
1. List the names of the two index fossils in the associated image (see Figure 8.13, p. 217) for names
Exogyra and inoceramus
2. The overlap in ranges of the index fossils indicates the age of the rock. Express that age in terms of the
period(s) of the geologic time scale, using the modifiers (epochs) like “early, “middle”, or “late”. Example: late Triassic to early Jurassic.
Late Triassic to late Cretaceous
3. The answer to ‘2’ above is an example of relative time. What is the numerical age
of this rock expressed as a range
in millions of years.
From about 252 million years to 66 million years ago.
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