22 



GEOLOGY AND QUICKSILVER DEPOSITS. NEW ALMADEN DISTRICT, CALIFORNIA 



FIGURE 11. Bold outcrop of the Calera-type limestone occurring in 

 the Franciscan group. The more resistant lenses are dark chert, 

 which accompanies the limestone In most places. 



FIGURE 13. Calera type of limestone of the Franciscan group Inter- 

 bedded with tulfaceous and calcareous shale, a~ . x|...~, ii in nuidcut 

 1 mile west of horseshoe bend in Guadalupe Canyon. Beds on the 

 left side of the photograph yielded the Upper Cretaceous Foraminif- 

 era described by Cushman and Todd and by KUpper (p. '2'i\. 



FIOCRB 12. Thin beds of limestone (Is) of the Franciscan group Interla.vered with tuffaceous shale (T). Roadcut along Los Oato-Santa 



Crui highway, one-half mile south of Los Uatos. 



