Geology Exam Part #2

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In Colorado National Monument, a major unconformity exists between the Precambrian rocks (1.4 bya) and the Triassic Chinle Formation (1200 mya). The hiatus represented by this gap is:

1200 million years

The oldest rocks in Colorado are approximately ____ old

2.7 billion years

Which of the following is not a physiographic province in Colorado?

Cascade Mountains

Grand Junction is located in the .... Physiographic Province

Colorado Plateau

The last time the area now known as Colorado was flooded by ocean water

Cretaceous Period (Phase 4)

From the surface of the Earth down to the center, the Earth's internal zones are:

Crust, mantle, outer core, inner core

Numerous paleogeographic maps were shown during Prof. Cole's lectures. The geologist-artist who constructed these maps is..

Dr. Ron Blakey, recently from Northern Arizona University

Denver is located on the wester edge of the ..... Physiographic Province

Great Plains

The energy that drives the "tectonic engine" (plate movement) comes from:

Heat, which comes from radioactive decay of Uranium, thorium, and potassium, plus heat left over from the earth's formation

Which of the following statements pertains to the concept of superposition?

In a stack of undeformed sedimentary rocks, the oldest layer will be at the bottom

Regarding quantitive (numerical) age dates for Precambrian igneous rocks in Colorado, which of the following statements is correct?

Most dates cluster around 250, 130, and 75 million years ago

The plate-tectonic formation of the supercontinent called ... was the trigger for the creation of the Ancestral Rocky Mountains

Pangea

When did glaciation significantly impact Colorado?

Phase 6

Argon-40 is the radioactive decay product (daughter) of...

Potassium 40

You are driving on Interstate 70 over the Front Range near the Eisenhower Tunnel and your car sputters to a stop. As you wait for help to arrive, you start looking at the rocks in a nearby road cut. Which of the following will you observe?

Precambrian metamorphic and igneous rocks

The giant Phase 6 "crack" (divergent plate boundary) in Colorado is called the:

Rio Grande Rift

The orogeny took place in Utah, Arizona, and Nevada.

Sevier

Which statement summarizes the occurrence of Silurian sedimentary rocks?

Silurian sedimentary rocks are only found in diatremes of north-central Colorado

The largest physiographic province in Colorado is:

Southern Rock Mountain

These two sedimentary rock units are Precambrian in age

The Unita Mountain and Uncompahgre Groups

Which of the following statements best summarizes Colorado's history during Phase 2 (Cambrian-Mississippian periods)

The seas came in and the seas went out

Which statement is false?

There are three types of strain (deformation): elastic, plastic, spastic

Which of the following statements describes the velocity at which tectonic plates move?

They move about the same rate that your fingernails grow (inches per year)

If sedimentary rocks are deformed into an "Arch"-shaped fold (cross-sectional view) the structure is called:

an anticline

If sedimentary rocks are deformed into a "Sag"-shaped fold (cross-sectional view) the structure is called:

an syncline

Igneous rock type (magma type) that is created by the partial melting of oceanic crust in a subduction zone

andesite

This partially molten layer of igneous rock underlies the lithosphere

asthenosphere

The assigned video was produced by geologists and graphic artists

at the University of Colorado, Boulder

Which of the following is not a basic type of heat transfer?

gravity

The earth's core is thought to be composed of mainly.....

iron and nickel

If we could use a time machine to visit Grand Junction area during late Phase 3 (Jurassic) when the Wingate Sandstone was being deposited, we would see:

large migrating sand dunes

By definition, the rocks below a nonconformity consist of:

metamorphic and/or igneous rocks

A spectacular fold called a ..... can be seen in the sedimentary rocks along the front of the Colorado National Monument.

monocline

The term used to define a period of mountain building in the geological past:

orogeny

New oceanic crust is created here.

spreading ridges at divergent plate boundaries

A normal fault is defined by:

the foot-wall block moving up with respect to the hanging-wall block

The time required for one-half of the radioactive parent atoms to decay to their stable daughter atoms is called:

the half life

A reverse fault is defined by:

the hanging wall block moving up with respect to the foot wall block

When an igneous rock is dated by the uranium-lead or other radiometric method the number (date) that is obtained indicates:

when magma cooled and solidified into rock

If an igneous dike crosscuts a sandstone bed, the dike is .... the sandstone

younger than


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