1. 1st group project is due Friday March 17 (day before Spring Break) Please see the class website for all the details. Your group may be 3 or 4 people, NOT 1 or 2!

2. Environ- ment Grain size Clast rnd, sort Sed. structures Clast variation alluvial fan Small pebbles to large clasts (far to near source) Partially rounded, pretty poorly sorted. Some very angular Graded bedsDepends on the source area! river Small grains: small pebbles to sand to silt Rounded grains, sorting varies based on “dynamics” of the river Graded beds, cross bedding. Flood plain: normal grading, mud cracks Variation decreases down river lake desert Very small sand grains to silt Very rounded, pitted Large, tall cross bedsVery very little variation! shoreline Very small grains roundedripples: symmetricLittle variation