Objectives:

Upon completion of this unit students should be able to: Describe longitudinal and lateral profiles (shapes) of an alluvial fan. Discuss the difference between a debris flow and a stream-dominated alluvial fan. List common features and deposits of an alluvial fan, including grain size patterns (longitudinal and vertical). Name the parts of an alluvial fan, and discuss the sedimentary structures in each. Discuss braiding parameter and meander wavelength as a method of classifying stream types (Rust's classification). Describe the flow, load, gradient, bar forms, bank material and general architecture of a typical braided stream. Distinguish between longitudinal, linguoid/transverse and lateral bar forms.

Reading Assignments:

Lecture 10: Alluvial fans- Boggs, 5th edition, pp. 208-209, 211-215   Lecture 11: Braided streams- Boggs, 5th edition, pp. 215-220   Fill out a reading log for each reading assignment.  Reading logs are due at the start of class on Wednesday   Reading log

 

Class notes:

Lecture 10 notes Lecture 11 notes

 

Graphics from lectures:

Lecture 10 graphics Lecture 11 graphics

Lab this week:   Sedimentary petrography week 1.  This week we will meet in Placer Hall rm. 1002, and will look at clastic sediments in thin section.     Your lab will be due two weeks from today.  In this week's lab and next week's lab we will identify, draw and describe common clastic grains.  You will turn in a "grain catalog" two weeks from today.    Bring drawing pencils and colored pencils to lab!   I will pass out a copy of the lab when we meet.  You do not need to print a copy of the lab.  This copy is for your reference or to replace lost labs! Grain catalog