Page 247 - Laboratory Manual in Physical Geology

ACTIVIT Y 8.2 Determining Sequence of Events in Geologic
Cross Sections

Name: ______________________________________ Course/Section: ______________________ Date: ___________

A. Review the legend of symbols at the bottom of the page. On the lines provided for each cross section, write letters to indicate
the sequence of events from oldest (first in the sequence of events) to youngest (last in the sequence of events). Refer to
FIGURES 8.1 – 8.9 and the laws of relative age dating (page 209 as needed).

Youngest
F
B
R
K
N
S
D

M
O J
G C
A
P
L
E
H
P
Oldest
Geologic Cross Section 1

Youngest
G
Muav Limestone
Cambrian H Bright Angel Shale H

I Tapeats Sandstone I
Nankoweap Chuar Shales R Bass R
A
Group
Shinumo Quartzite
B Dox Sandstone Dolomite GRAND CANYON
INNER
GORGE
Precambrian C Hakatai Shale F Gravel Vishnu
Basalt
D
S Zoroaster Schist
L M Granite
K
E J

Geologic Cross Section 2 Oldest

KEY TO SYMBOLS

Sedimentary rocks Igneous rocks Metamorphic rocks

Conglomerate Gravel Sandstone Siltstone Granite Basalt Schist Gneiss
Other features

Shale Clay Limestone Dolomite Zone of Unconformity Fault Contact
contact
metamorphism
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