Exam 6: Sedimentary Rocks the Archives of Earth History

Limestone deposits most likely form in which environments?

Large-scale cross-beds (greater than 10 ft. in height) commonly indicate a ___________ sedimentary environment.

Extensive burrowing by organisms that may destroy structures by thoroughly disrupting sediments is called ____________________.

A(n) ____________________ is a long accumulation of abundant sand that lies offshore and is separated from the mainland by a lagoon.

Compare and contrast sediments deposited from the coastline to the deep marine environment. Give examples of the sedimentary rocks that form by the lithification of these sediments.

A deposit of sediment where a stream or river enters a lake or the ocean is called a(n) ____.

The degree to which detrital particles have had their sharp edges and corners smoothed off by abrasion is ____.

Sand deposits made by ____________________ are well sorted and have large (tens to hundreds of feet) cross-beds.

Dense marine flows composed of a mixture of water and sediment are called turbidity currents.

Crossbeds and current ripple marks can both indicate the direction of a current. Explain how crossbeds and current ripple marks differ and the types of environments you would expect to find them in.

Current flow direction can be determined by cross-beds and some ripple marks.

A sedimentary layer in which grain size decreases from the bottom up is ____.

Poorly sorted, nonstratified drift deposits are called ____________________.

A long sand body more or less parallel with a shoreline but separated from it by a lagoon is a ____.

A sample of deep-sea sediments would be expected to contain ____.

The gently sloping area adjacent to a continent is the ____________________.

Sand dunes are most likely formed in a wet tropical environment.

An example of a biogenic sedimentary structure is ____.

Describe and discuss the carbonate deposits expected in different parts of an organic reef environment.

Fine-grained clays, silts and muds would always indicate a ____ environment.