EXAM TWO VII

Question 1

The first expedition down the Colorado River though the Grand Canyon was led by

Answer 1

John Powell

Question 2

The oldest sedimentary layer in the Grand Canyon is the ______.

Answer 2

Bass Limestone

Question 3

The earliest fossil record of life in the Grand Canyon are ______ found in rocks of th Grand Canyon Supergroup:

Answer 3

stromatolites

Question 4

_______ fossils can be found in the Paleozoic Bright Angel Shale:

Answer 4

Trilobite

Question 5

During the _______ era, the dominant sedimentary process in the western interior of US was marine chemical sedimentation (e.g. lime) in a shallow sea:

Answer 5

Paleozoic

Question 6

The oldest rock in the Grand Canyon are the Precambrian _________:

Answer 6

Vishnu Schist

Question 7

________ is a 1.2 ma to 12,500-yrs cinder cone and lava fall on north rim of Grand Canyon:

Answer 7

Vulcan’s Throne

Question 8

The _________ separates flat-lying Paleazoic strata of the Grand Canyon from the underlying Grand Canyon Supergroup:

Answer 8

Great Unconformity

Question 9

The broad, gentle-sloping apron of sediment forming the Tonto Platform was eroded from which rock layer of the Grand Canyon?

Answer 9

Bright Angle Shale

Question 10

________ is composed of cross-bedded dune deposits

Answer 10

Coconino Sandstone

Question 11

Nautiloid fossils can be found i the _______:

Answer 11

Redwall Limestone

Question 12

The youngest flat-lying rock layer exposed along the walls of the Grand Canyon is the __________.

Answer 12

Kaibab Limestone

Question 13

Fossil tracks of a Permian cow-size lizard can be found in the ________:

Answer 13

Coconino Sanstone

Question 14

Much of the river erosion that formed the Grand Canyon occurred during the period of time known as the _______.

Answer 14

Pleistocene