ECOLOGY AND TAXONOMY OF Holimeda 



255 



FORAMINIFCRA 



HALIMEOA DEBRIS 



/.y 





7... 



'%. 



FINE DEBRIS 





av-: 



'ijISCELLAHEOUS'' 



^ 10 ■ 



Fig. 83. The distribution of Halimeda sediments, compared to other major sediments, 

 in the lagoon of Enewetak. Lines of equal abundance are drawn through the 25, 50 

 and 75% values. The lower two figures give the cumulative percentages of the six 

 categories of sediments recognized along the transect AA', and a profile of the 

 lagoon bottom from A to A' showing some of pinnacles. (From Emery et al. (1954), 

 reproduced with permission.) 



per unit area, L is the area of lagoon, R^ and R^^ are the vertical and 

 horizontal components of the growth of the reef ridge, t is the time. 



Both the lagoonal and reef-ridge contributions to the atoll mass 

 must be functions of the history of sea-level and perhaps of other 



