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Coastal Carolina University *
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Course
101
Subject
Geography
Date
Dec 6, 2023
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Uploaded by ChancellorTeamFalcon33
Chapter 14 – M-S Rocky Mountains
Each answer worth 2 points unless otherwise specified.
102 points total.
Please use
blue
type for your answers (type anywhere on the blue line and the type should be blue and bold).
1) The Middle-Southern Rocky Mountains are part of a large domal uplift. This large domal uplift also includes these other
two physiographic provinces.
Great Plains
and
Colorado Plains
2) The Wyoming Basin is an extension of the
Great Plains
physiographic province into the M-S Rockies.
3) There are four primary rock types in the M-S Rockies.
Name each of the four rock types and their age range
.
1)
crystalline shield 2.5–3.5 billion years
2)
young granitic intrusions 75-18 million years
3)
sedimentary less than 541 million years
4)
volcanic rock 34-18 million
4) The Colorado Mineral Belt cuts diagonally across Colorado from the town of
Boulder
to
Durango
5) Which two of these rocks form the Colorado Mineral Belt?
Volcanic rock
and
shallow granitic intrusions
6) There are seven major crystalline-cored anticlinal mountain ranges in the Colorado-New Mexico Rocky Mountains.
Which anticlinal mountain range boasts the highest peak in the Rockies?
Colorado
And what is the name of the highest peak in the Rocky Mountains?
Mount Elbert
Which anticlinal mountain range is present in the San Juan Mountains of southwest Colorado?
Needle Mountains
Which anticlinal mountain range includes Pikes Peak?
Rocky Mountains
7) Nearly flat-lying sedimentary rocks of the Great Plains are bent upward along the east side of the Front Range in
Colorado to form the
Dakota
hogback. This hogback well displayed at Garden of the Gods in the city of
Colorado Springs
and at Red Rocks, west of the city of
Morrison
8) What is a Park, as defined in the Colorado Rockies?
A wide, flat-floored, mostly treeless, synclinal valley. Underlain
with sedimentary and some volcanic rocks.
9) The anticlinal mountains that formed between 75 and 55 million years ago, but were subsequently eroded, beveled, and
buried in their own debris, are known as the
Laramide
Mountains.
10) Colorado is known for its red rocks. Most of these were formed by erosion of the
Rocky
Mountains.
11) What is the name of the erosion surface that was uplifted, exhumed, and separated from the Great Plains in the past 6
million years to form summit areas in the present-day Colorado Rocky Mountains?
the Laramide Orogeny
12) In which Colorado mountain range is the Rocky Mountain Erosion Surface best preserved?
Colorado Front Range
13) The Middle-Southern Rockies that we see today developed largely in only the past
6
million years.
14) The Front Range is located between the
Cache La Poudre
River at Casper, Wyoming, and the
Colorado
River at Canon
City, Colorado.
15) Of the eight structural forms, which structural form most characterizes the Front Range?
Fault block
16a) What does the topography of the Front Range look like if viewed in an east to west profile across the
mountain?
Would show a gradual rise in elevation from the great plains to the Rocky Mountains
16b) Where in this profile is the Rocky Mountain Erosion Surface?
The base of the mountain range
17) Normal faults in the southern part of the Front Range have created a valley now occupied by the town of
Colorado Springs
18) The Colorado Piedmont forms a section of the Great Plains located east of Denver. Prior to erosion to form the lower
steep part of the Front Range, the Colorado Piedmont was part of a different section of the Great Plains known
today as the
high plains.
19) The location where the Great Plains gradually rises to form a continuous surface across the summit area of the Front
Range is known as the
Gangplank
20) The Gangplank is located between the towns of
Cheyenne
and
Laramie
Wyoming.
21) Active normal faults in Colorado are part of the
Rio Grande
Rift.
22) The Sawtach Range is located between the towns of
Leadville
on the east, and
Aspen
on the west.
23) Active normal faults are present in the
Arkansas
River Valley on the
east
(choose east, west, north or south) side of the
Sawatch Range.
24) There is evidence that the
Arkansas
River Valley and the
Sawatch
Range were carved out of the flank of the Sawatch
Range by normal faults.
25) Are the Spanish Peaks cored with young granitic rock or with crystalline shield?
Granitic rock
26) Great Sand Dunes National Park is located in the
San Luis
Valley.
27) What is the age range of the crystalline shield in Colorado?
2.5-3.5 million years
28) Most of the silicic volcanic rocks in Colorado are located in the
San Juan
Mountains.
29) The Wind River Range boasts
Gannett
Peak, the highest peak in Wyoming.
30) Crystalline shield rocks in the Wind River Range are between
2.6
and
3.1
billion years old.
31) There is evidence to suggest that the erosion (plateau) surface across the Wind River Range had formed along a major
geologic boundary. Name this geological boundary.
The Great Unconformity
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