Exam 7: Pages of Earths Past: Sedimentary Rocks

A clastic rock comprised of sand-sized grains derived from the physical weathering of granite and containing a sizable proportion of feldspar is termed ____________.

Unlike physically precipitated chert,biochemical chert ____________.

Beach sediments would travel ___________ the ocean during a transgression and ___________ the ocean during a regression.

Cemented shells of marine organisms form which kind of sedimentary rock?

In which of the following phenomenon are sediment records NOT preserved?

Grains become rounded primarily during ____________.

Compaction and cementation of grains occurs during ____________.

If a geologist found preserved mud cracks,he or she could conclude that the environment in which they formed ____________.

Asymmetric ripples are indicative of unidirectional flow,whereas symmetric ripples are indicative of flow in multiple directions.

When limestone becomes chemically altered so that half of the calcium atoms are replaced by magnesium,the resultant rock is termed ____________.

Topset,foreset,and bottomset beds are indicative of ____________.

Which environment would most likely produce sedimentary deposits characterized by poorly to moderately sorted,angular to subangular grains that consist of feldspar,quartz,and lithics (rock fragments)?

Siltstone or mudstone containing marine fossils likely formed in a ___________ environment.

Physically precipitated (chemical)limestone that forms in caves is termed ____________.

If a geologist were to dig below the current beach and find offshore sediments underlain by beach and swamp deposits then he or she could conclude that ____________ has occurred.

A well-sorted sandstone with asymmetric ripples was most likely deposited as sand by a ____________.