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