Geol 370: Sedimentology and Stratigraphy Topic 14b: Fan Delta Systems

1. Fan-deltas are, essentially, alluvial fans that build directly into a
standing body of water with Gilbert-style internal structure.
Fan-delta SystemsFan-delta Systems
Photo by W. W. Little

2. Photo by W. W. Little
Gilbert-type DeltasGilbert-type Deltas
Gilbert-type fan-deltas consist of pro-delta fine-grained sediment that
settles from suspension, overlain by coarse-grained foreset beds
formed by avalanching down the delta front, and capped by coarse-
grained, braided fluvial deposits.

3. Photo by W. W. Little

4. Photo by W. W. Little

5. Photo by W. W. Little

6. Photo by W. W. Little

7. Photo by W. W. Little

8. Photo by W. W. Little

9. Photo by W. W. Little

10. Photo by W. W. Little

11. Photo by W. W. Little

12. Photo by W. W. Little

13. Photo by W. W. Little

14. Video Demonstration of Fan-deltaic
Sedimentation
• http://video.google.com/videoplay?docid=2680216