1. PRIMARY SEDIMENTARY STRUCTURES A)Stratification Structures & Bedforms 1) Bedding & Lamination 2) Bedforms 3) Cross-lamination 4) Irregular stratification B) Bedding Plane Markings

2. BEDDING

4. Laminations < 1cm

5. Graded Bedding – Which way is up?

6. Bedforms & Cross-Stratification A) Ripple Marks – modern beach

7. Ripple Marks in Sandstone – Rock was formed on an ancient beach

10. 2) Sedimentary Structures B) Cross Beds – the inside of Ripple Marks

12. Checkerboard Mesa – Zion National Park, Utah

14. Barchan Consistent wind Limited Sand Transverse Consistent wind Abundant Sand Parabolic “Blowouts” Coastal Dunes

15. Linear (Seif) Converging wind. Limited Sand Star Dunes Variable wind directions.

19. 2) Sedimentary Structures C) Mud Cracks – Environment that periodically dries out