Geology 1050I Grand Canyon

Front 1

Most of the rocks exposed in the Grand Canyon above the Inner Gorge are:

Back 1

Sedimentary

Front 2

In what Period of geologic time did the Redwall Limestone form?

Back 2

Mississippian

Front 3

A rock unit with distinctive physical and/or chemical characteristics is called a:

Back 3

Formation

Front 4

A slope-forming rock unit in an arid climate is:

Back 4

Shale

Front 5

T/F The elevation is higher at the South Rim than at the North Rim.

Back 5

False

Front 6

T/F Although the rocks of the Grand Canyon are ancient, the Grand Canyon itself is a relatively young erosional feature.

Back 6

True

Front 7

T/F The Bright Angel Trail provides relatively easy access from the rim to the river because it follows a fault.

Back 7

True

Front 8

T/F The bottom of the canyon is cooler than the rims.

Back 8

False

Front 10

The Grand Canyon is being eroded by what river?

Back 10

Colorado River

Front 11

Who led the famous 1869 exploration of the Grand Canyon?

Back 11

John Wesley Powell

Front 12

What is the main reason that a human-made dam is not a permanent feature on a river?

Back 12

Sediment fills up the reservoir behind the dam

Front 13

The oldest rocks in the Inner Gorge of the Grand Canyon are _____ in age.

Back 13

Precambrian

Front 14

Most of the rocks exposed in Grand Canyon National Park above the Inner Gorge are _____ in age.

Back 14

Paleozoic

Front 15

Which geologic formation is Grand Canyon National Park most famous for?

Back 15

Redwall Limestone

Front 16

What was the environment of formation for the Redwall Limestone?

Back 16

Shallow tropical ocean

Front 17

The Vishnu Schist and Zoroaster Granite are the roots of an ancient eroded mountain range that is referred to as:

Back 17

Mazatzal Mountains

Front 18

In the last million years, there have been over 100 natural dams on the Colorado River. What caused this natural damming?

Back 18

Lava Flows

Front 19

The Great Unconformity between the older tilted Grand Canyon Supergroup and the overlying younger and flat-lying Paleozoic rocks is:

Back 19

An Angular Unconformity

Front 20

A cliff in the Grand Canyon is probably:

Back 20

Sandstone or limestone

Front 21

The Inner Gorge is narrow and V-shaped rather than stairstepped like the upper canyon because:

Back 21

The rocks are uniformly resistant and eroding slowly

Front 22

The South Rim gets its water from:

Back 22

Roaring Springs on the north side of the canyon

Front 23

Which principle states that in an undeformed sequence of sedimentary rock layers, the oldest rocks are at the bottom and the youngest are at the top?

Back 23

Superposition

Front 24

When you are on the rim of the Grand Canyon, you are standing on:

Back 24

Permian Kaibab Limestone

Front 25

The Ordovician and Silurian time periods in the Grand Canyon are represented by:

Back 25

An unconformity

Front 26

an assemblage of related formations and groups

Back 26

Supergroup

Front 27

two or more associated formations with notable common features

Back 27

Group

Front 28

a rock unit with distinctive physical and/ or chemical characteristics

Back 28

Formation

Front 29

A minor unit within a fomation

Back 29

Member

Front 30

The earliest rocks in the Grand Canyon are _______

Back 30

Precambrian