Figure 9. 



Development of marsh with rising sea level and continued sedimentation 

 hypothetical. 



Figure 10. 



Section across marsh at widest part. Soundings by Patrick Butler. 



Figure 11. 



Stages in development of marsh at extremity of sand spit. Stage 4 is 

 hypothetical. 



Figure 12. 



Stages in development of intertidal islands of marsh on sand flats. 

 5 is diagram of drainage pattern at stage 4. 



In figures 9-12 vertical scale exaggerated some hundred fold. 



42 



