Geology 103 (Sedimentology and Stratigraphy)

California State University, Sacramento

Week 8: Meandering streams and

Lacustrine systems

Objectives:

Upon completion of this unit students should be able to:

  • Describe the general characteristics that are associated with a meandering stream.  Include gradient, common bar forms, load, bank material, channel form and sinuosity.

  • Show how helical flow contributes to erosion of the cut bank and deposition on the point bar.

  • Describe the vertical and longitudinal grain size patterns that you would expect to see in a point bar.

  • Discuss the features that form on the floodplain of a meandering river, including crevasse splays, the natural levee, floodplain deposits, and ox-bow lakes.

  • Describe how a meandering stream migrates across the floodplain, producing a fining-upward sequence.

  • Differentiate between braided, meandering and anastomosing streams.

  • Identify the set of sedimentary structures, fossils and bedding that are found in lacustrine deposits

  • Discuss the different types of lacustrine deposits- organic-rich, evaporite, carbonate and clastic

  • Differentiate between open and closed basin lacustrine deposits

  

Reading Assignments:

Lecture 12: Meandering streams- Boggs, 5th edition, pp. 215-220

and

GSA Today article- Katrina crevasse splay deposits

 

Lecture 13: Lacustrine systems- Boggs, 5th edition, pp. 228-234

 

Please fill out a reading log for the GSA article and the lacustrine systems section.  Reading logs are due Wednesday at the start of class.

 

Reading log

   

Class notes:

Lecture 12 notes

Lecture 13 notes

   

Graphics from lectures:

Lecture 12 graphics

Lecture 13 graphics

  

Lab this week-

 

Powerpoint stratigraphic columns, continued.   Bring your yellow field notebook to class.