Exercise 7 (Sedimentary rocks-chapter 7)

Which of the following is not a common type of natural cement?

Fluorite

Which of the following controls the size, shape, and sorting of clasts

Steepness of slope

________ sandstone generally indicates that it was derived from crystalline rocks and then rapidly buried.

Arkose

________ minerals give sediment deposited on land a reddish color, as displayed in the spectacular red-rock landscapes of the Southwest

Iron oxide

________ can be formed from the calcium carbonate remains of animals, as well as inorganically by precipitation from water.

Limestone

___________ is a common rock that consists mainly of the mineral calcite (CaCO3)

Limestone

A conglomerate can be described as____________ while a breccia can be described as__________

NOT being poorly stratified; being well stratified only having a compacted, clay - rich matrix; having no matrix

Chert is a rudimentary rock composed of fine-grained _____

Silica, or quartz; (SiO2)

________ is a type of limestone can form in cold springs, hot springs, lakes and caves.

Travertine

Most sedimentary rocks contain layers, also known as ____________

beds

What does gypsum and halite have in common?

both can form when seawater evaporates in tidal flats and narrow seas.

In clastic sedimentary rocks, the sediment is held together by

cement

Beds that are at an angle to other beds in the same rock are called_____________.

cross beds

A conglomerate is...

has rounded pebbles, cobbles, or boulders with sand and other fine sediment between the large clasts.

Which one of the following is not a non-clastic sedimentary rock?

shale

Peat usually forms in ________

swampy environments

Turbidity currents are made up of...

tan sandstone beds interbedded with dark, deep water marine shales.

Clastic sedimentary rocks are described primarily on___________

their clast size

Which of the following statements concerning sedimentary rocks is not true?

they were originally deposited at depth below the bottom of the sea