300 University of California. [Vol. i. 



Figure 3. — Small secondary dike (Cuyamas eruptive). The important feature 

 of this section is the presence of a large amount of secondary 

 feldspar replacing the analcite. < 35. 



Figure 4. — Section from a small dike (Cuyamas eruptive). Titaniferous mag- 

 netite is the characteristic feature of this section. The mineral 

 is present in rods and more or less regular polyhedral forms. 



x 35- 



Figure 5. — ( >ceanic eruptive showing the angular analcite areas penetrated 

 by the short lath-shaped feldspars. ■ 35. 



Figure 6. — Section showing the spherulitic facies of the Oceanic dike. The 

 feldspars are comparatively fresh but are almost inclosed in the 

 calcite and green matty areas. The spherulites are always asso- 

 ciated with the secondary products. • 35. 



