NO. 2 FRASER : SCIENTIFIC WORK, VELERO III, EASTERN PACIFIC 133 



PLATE 49 



Fig. 105 Isla Raza, Gulf of California, looking north toward Isla Partida and 

 Angel de la Guardia Island, which are shown in the left background. 

 The pools in the foreground have been artificially built for the culture 

 of oysters. 



Fig. 106 Isla Partida, showing the western half of the island as viewed from 

 the eastern half. The inlet at the right and a corresponding indentation 

 to the left of the picture divide the island opposite the low isthmus 

 shown in the foreground, so that from a little distance it resembles two 

 islands. Chart 59, p. 400. 



PLATE 50 



Fig. 107 Unusual geologic formation at Isla Partida, Gulf of California. The 

 columnar basalt shows cooling from a series of centers. The water in 

 the foreground is deep, the illusion of shallowness being given by reflec- 

 tions of the rock mass. 



Fig. 108 A number of planed terraces are seen in this photograph, taken at San 

 Francisquito Bay, Gulf of California. The arm of the bay shown in the 

 foreground is subject to extreme rise and fall of tidal level, since it is 

 located opposite the narrow Sal Si Puedes Channel. Chart 58, p. 399. 



Fig. 109 San Francisquito Bay, Gulf of California, is located just below San 

 Francisquito Point, which in turn is located opposite San Lorenzo 

 Island, across the famed Sal Si Puedes Channel, the swift current of 

 which was much feared in the days of small sailing vessels. 



PLATE 51 



Fig. 110 View of Angel de la Guardia Island from Granite Island, located in 

 Puerto Refugio. A flock of pelicans may be seen along the edges of the 

 rocky spit which extends into the bay. Chart 59, p. 400. 



Fig. Ill Puerto Refugio, Angel de la Guardia Island, has many arms extending 

 among the low-lying foothills of the mountain chain arising in the 

 background. The beach in the foreground shows clearly the 12-foot rise 

 and fall of tide which continually alters the relative proportions of 

 land and sea. 



PLATE 52 



Fig. 112 Puerto Refugio, Angel de la Guardia Island, seen from a hilltop located 

 on the east side of the bay. The series of rocky spits extending into the 

 bay are all part of the same bed of hard rock which underlies the softer 

 deposits. The mainland of Lower California can be distinguished in the 

 far distance. 



Fig. 113 Reef at Puerto Refugio, Angel de la Guardia Island, a favorite collect- 

 ing ground for the marine zoologists. It is the result of a tilted bed of 

 hard rock which has withstood the weathering that has reduced the 

 softer formation. 



PLATE 53 



Fig. 114 The entrance to Angeles Bay, Lower California, is guarded by several 

 small islets, two of which are shown in the center of the picture. Much 

 profitable dredging was accomplished by the small dredge boat in this 

 vicinity. (See pis. 13, 14.) 



Fig. 115 Round Top Mountain, elevation 3,423 feet, rises behind Angeles Bay, 

 Lower California. An alluvial fan, cut by wave action, is shown in the 

 foreground. 



