504 



APPENDIX 



case of calcareous sand-dunes formed of oolitic grains, as in the 

 Bahamas, we might obtain some interesting results, and it may be 

 that under present conditions the behaviour of the calcareous sand- 

 hills of the Bahamas would be very different from that of the medanos 

 or moving sand-hills formed of volcanic rocks in Peru. In the 

 case of the Bahama deposits we ought to know in what way the 

 oolitic grains of the seolian rock differ as regards form and external 

 markings from those of the beach sand and from those of the mud 

 on the submerged banks. The effects of attrition ought to be very 

 pronounced in the case of the grains of the wind-blown rock. Much 

 depends on the answer to the query whether such effects of attrition 

 display themselves ; and in this and in other connections concerned 

 with these seolian rocks of the Bahamas we must be prepared for 

 surprises. 



(In addition to the papers of Dr. Vaughan, named at the end of 

 Chapter XI, may be mentioned a very interesting note comparing 

 the formation of the Floridian and Bahamian oolites in the Journal 

 of the Washington Academy of Sciences, May 19, 1913. The origin 

 of these oolites is also discussed in papers of more recent date on 

 the Floridian Plateau and on shoal-water samples from Murray 

 Island (Australia), the Bahamas, and Florida, in publications 133 

 and 213 of the Carnegie Institution of Washington, as well as in a 

 paper on the geology of the Bahamas and Southern Florida in the 

 Yearbook of the same institution for 1914.) 



