200 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
CONCLUSIONS. 
1. The fossils and existing coast fauna are as yet too little known to 
throw much light on the question of the age or ages of the reefs. 
2. The stone reefs are built against rocks of all ages from Archaean 
to recent. 
3. The only rocks with which they seem to be interbedded are Plio- 
cene and recent. 
4. It is therefore inferred that the formation of the stone reefs began 
in early Pliocene times, and that it has gone on down to the present time. 
