Exam 7: Sedimentary Rocks

Which is the most common chemical sedimentary rock?

The sedimentary rocks, salt and gypsum, are deposited by what process?

_______sandstone contains abundant feldspar, suggesting that the sand was derived by weathering and erosion of granitic bedrock.

Detrital sedimentary rocks are classified (named)based on the_______ .

_______is composed mainly of lithified, organic debris that accumulated in ancient, heavily forested swamps.

_______is not a common cementing agent for sandstones.

Fossils often provide valuable information about climatic conditions of the geologic past. How else might a geologist infer ancient climatic conditions using sedimentary rocks? (Hint: Think in terms of the conditions necessary to form certain rocks and also features/structures found in sedimentary rocks.)

Which of the following applies to the basic constituents of halite, gypsum, and sylvite?

Detrital grains of which mineral(s)are extremely rare in detrital sediments? Why?

_______cement produces bright- red and yellow colors in some sandstone.

_______, a common mineral found in igneous rocks, is the most abundant mineral in detrital sedimentary rocks.

Coal beds originate in_______ .

Which property of sediment describes the range of different grain sizes in a detrital sedimentary rock?

A graywacke is_______ .

_______is the most common type of chemical sedimentary rock.

Which of the following sedimentary rocks would you expect to have originally been deposited by fast- moving streams?

Nonclastic textures are common in which of the following sedimentary rocks?

Red, brown and yellow sandstones are cemented by oxides of_______ .

_______are further concentrated in a residual brine after NaCl is crystallized.

Which statement concerning sedimentary rocks is NOT true?