GUAM. 373 



the crystallization of the rocks would seem to indicate that they were of 

 considerable age. 



Near the town of Agate, on the west coast, the outcrop of coral rocks 

 becomes more or less covered with volcanic soil washed down from the 

 mountains immediately to the east. About half a mile to the south of 

 Agate is a remnant of a spur (PI. 233, fig. 4), similar to that of Orote and 

 of Cabras ; it has all the characteristics of the elevated coralliferous lime- 

 stone of Orote. To the south of San Luis d'Apra the outl\'ing islands 

 and islets of the west coast, as far as Point Facpi, consist of elevated coral- 

 liferous limestone rock much nndercut and eroded (PI. 233). The Peladgi 

 Islands, Alutung and Anaya, are about fifteen feet in height and deeply 

 nndercut. The small island off Point Facpi is at least thirty feet high and 

 is exceedingly jagged and honeycombed (PI. 198, fig. 1). The coast in 

 the region of Facpi and immediately to the north is quite abrupt; the vol- 

 canic rocks form a bluff at least seventy-five feet in height (PI. 198, fig. 1). 

 A number of volcanic negro-heads lie at the foot of the bluff, extending 

 fully fifty yards out into the sea, while at a distance of 100 to 120 yards 

 lie the high coral islands just mentioned with a few coral negro-heads 

 at their base. 



Immediately to the north of Point Facpi is an elevated coral reef about 

 two and one-half feet above high-water mark. The corals here are recent 

 and appear to be in place ; while they are hard and to a certain extent 

 calcified, they differ materially in structure and appearance from the 

 elevated crystalline coralliferous limestone masses of the i.slets to the 

 north and of Orote Point, as well as from the coral boulders derived 

 from the outlying islands. 



Looking south from Point Facpi we could see that the islands of 

 that part of the west coast are also composed of elevated coralliferous 

 limestone and are about the same height as Alutung and Anaya. The 

 shore line is volcanic for a considerable distance to the south of Point 

 Facpi ; we then strike again the elevated coralliferous limestone with its 

 characteristic high bluffs. 



Apurguan Point form's the northern promontory of the harbor of Agana. 

 Immediately to the east of Agana we could see outliers of elevated coral- 



