Exam 7: Sediment and Sedimentary Rocks

Briefly explain how coal forms.

Fossil "shoe prints" are evidence that humans and dinosaurs coexisted.

A vertical sequence of transgressive facies shows an offshore facies,superposed on nearshore facies.

Briefly explain why the study of sedimentary environments is important in the study of historical geology.

A vertical sequence of transgressive and regressive facies records the rise and fall of sea level.

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

Is banded iron formation a chemical or detrital sedimentary rock? Explain.

Under what conditions do carbonates form?

____________________ ripple marks form in response to wind or water moving in one direction.

The designation of sediment grain size,from largest to smallest,is _______,_______,_______,_______.

Sediment becomes sedimentary rock by the process known as _______.

____________________form when layers are deposited at an angle to the surface and the layers dip in direction of ____________________.

The uranium used in nuclear reactors comes largely from precipitated deposits in rocks such as black shale containing abundant organic matter.

What are sedimentary facies?

What is a fossil?

Sedimentary structures refer to what?

What is the most common and effective agent for transporting sediment?

Explain how fossils,and especially microfossils,can be used to help determine ancient depositional environments.

What are the two most common cements in sedimentary rocks?

Sedimentary layers in which grain size decreases from bottom to top are called graded beds.