Lab 3 SES 123
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School
Arizona State University *
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Course
123
Subject
Geology
Date
Dec 6, 2023
Type
Pages
3
Uploaded by Jadefischbeck
Module 3 Worksheets
91
Name____________________________________
MODULE 3
Worksheet 3A.
Using the principles of relative dating, determine the sequence of events that
occurred to form the rock arrangement shown in the cross section in
Figure 3-4
. List the events
from
oldest
at the bottom of the list to
youngest
at the top of the list.
Sequence of Events
(oldest at bottom of list;
youngest at top of list)
Jus
tify Your Chosen Sequence By Describing Each Unit’s Relationship
To The Other Units
Worksheet 3B.
Answer the following questions about the animations and photographs.
Examine the animation of the
seas moving in and out. If you
found a place where a marine
mud layer overlies a beach
sandstone, do you think that sea
level was rising or dropping
(transgressing or regressing)?
In the Hance Rapids
photograph, what is the oldest
rock unit and why?
In the Death Valley photograph,
which rock unit is younger, the
tilted gray layers or the upper
layer with the angular clasts?
Give at least two reasons why.
I
E
H
G
J
D
B
A
K
L
C
I is lower than H
H is lower F
F is lower than E
E Is the last layer before the seperation
Crosscutting Relationship
J is the development of the unconformity.
D is the oldest and bottom most layer of the top
B is above D
A sits above B
Intrusion of magma
Erosion that cut the canyon
River Gravels
F
The sea-level was dropping.
Lower Siltstone and shale
The tilted layer is older because it is sitting lower than the upper layer and it is below the
unconformity.
Module 3 Worksheets
92
Worksheet 3C.
In the space
below
, summarize the geologic history of Painted Canyon. The main geologic events
are listed below on the right (letter A, B, C, …).
Reconstruct the sequence of these events, from oldest (first event)
to youngest (last event), by considering the following:
1. For each rock sample your team identified in previous modules, observe its location (where it was
collected) and its rock type.
2. Analyze the computer images of Painted Canyon, noting the sequence of the rock layers and the cross-
cutting relations of faults and igneous intrusions (granite pluton, dark dike, and pegmatite dikes)
Once you have determined the sequence of events, write the letter of the events in their proper order (
oldest
at the
bottom of the list to
youngest
at the top of the list) in the number below on the left.
Last Event (most recent)
16.
____
15.
____
14.
____
13.
____
12.
____
11.
____
10.
____
9.
____
8.
____
7.
____
6.
____
5.
____
4.
____
3.
____
2.
____
1.
____
First Event (oldest)
A.
Emplacement of igneous dike
B.
Deposition of mudrock as seas came in
(transgression)
C.
Eruption that formed rhyolite
D.
Deposition of limestone and formation of
chert in clear water
E.
Pyroclastic eruption that formed volcanic tuff
F.
Uplift and erosion of metamorphic rocks
(formation of unconformity)
G.
Deposition of sandstone as sea moves in
(transgression)
H.
Erosion by stream to form the canyon itself
I.
Metamorphism of the basement rocks
J.
Offset of units along a fault
K.
Emplacement of granite pluton (This unit
reaches 500 feet in elevation and it crosscuts,
bakes, and therefore post-dates all units
below, including the tuff layer.
Whether the
granite post-dates the overlying rhyolite and
basalt is unknown).
L.
Deposition/formation of rocks that would later
be metamorphosed to form the basement.
M.
Deposition of breccia
N.
Deposition of conglomerate
O.
Eruption of lava flows that formed basalt
P.
Formation of very coarsely crystalline granite
(called
pegmatite
) dikes (light-colored dikes)
in metamorphic rocks
A
H
J
L
P
F
D
G
B
E
C
I
N
M
O
K
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