Department of Earth Science |Northeastern Illinois University

ESCI 121
Fall 2006

Daily Objectives #9  (September 26, 2006)                                                                        Dr. Sanders

By the end of today’s class, you should be able to do the following:


*  Examine and describe the properties of the common minerals that occur in sedimentary rocks. 

*  Explain what samples 7, 17, 19, and 20 have in common.

*  Explain what samples 18, 21, 30, and 35 have in common.

*  Examine and describe the properties of the hydrothermal minerals that occur in sedimentary rocks.  (Examples to be used in class: sample numbers 8, 14, 33, 34, 44.)

New Today:

*  List and describe the two main categories of weathering (chemical weathering and mechanical weathering), and give a few examples of each type.

*  Explain the steps in forming deposits of sediments, including weathering, erosion, transport, and deposition.

*  Distinguish between chemical sediments and detrital sediments, describing characteristics of each category and telling how they form.

*  Explain the difference between gravel, sand, and clay sediments. [We did not do this today; see Thursday 9/28/06.]

*  Explain the steps in forming sedimentary rocks from sediments, correctly using the term lithification.

*  Examine hand samples of sedimentary rocks, describe their textural features, and use a key to identify their names.  [We looked at but did not fully describe sedimentary rocks today; see Thursday 9/28/06.]

Department of Earth Science | Northeastern Illinois University

© 2006 Laura L. Sanders.  Last updated September26, 2006.