200 DESCRIPTION OF THE PLATES. 



PLATE III. 



Fig. 1. — Section across the valley of Santa Inez from tlie direction of La Purissima to Camp 

 22, at the foot of the north face of the Santa Barhara mountains. The river bed with 

 its most recent terrace is shown at a ; b represents the second terrace on the northwest 

 side of the river the mission is placed ; behind it is c, the upper terrace ; on the south 

 side of the river the strata rise toward camp, behind which lies a mass of jaspery 

 sandstone and amygdaloidal trap, t ; i, green grits and conglomerates ; g, h, brown 

 and yellow sandstones, containing Turritella, Mytilus, and Pachydesma ; e, f, whitish 

 sandstones, with fossils much injured, Turritella, Tapes, Crassatella, Cydas, and Ostrea; d, 

 sandstone grit, with calcareous layers, and veins of calcite and Turritella, Natica, Pecten, 

 Cydas, and Balanus. 



Fig. 2. — Section of the Santa Barbara mountains through the Gaviote pass. This represents 

 the slope of the strata southwards, the beds being almost similar to those on Fig. 1. 

 In the pass the strata are duplicated A and B ; only one fold is represented. 

 a represents the terrace slope lying between the range and the ocean, with the strata dipping 



S. and contorted. 

 h, whitish yellow argillite ; c, fine and coarse grits, imperfect impressions of fuci, no shells ; 

 d, brown sandstone, with Ostrea and Natica ; e, greenish sandstone, with Peden, Ostrea, 

 Turritella, and Pachydesma ; f, brown and green conglomerates and gypseous beds. 



Fig. 3. — Section on Arroyo Hondo, aftbrded by the stream cutting deeply through the terrace. 

 a, talcose and magnesian slate contorting the strata ; b, greyish sand rock ; c, loraminiferous 

 rock ; d, soft yellow slate. These strata belong to the San Luis group. 



Fig. 4. — Section showing the constitution of some of the coast ranges. Extent of the section 

 from the mouth of Arroyo Hondo to the eastern slope of San Rafael. These hills are 

 simple in composition, being sandstone strata, uplifted by serpentine, trachyte, and 

 amygdaloidal trap. 



a, distorted strata at Arroyo Hondo, with the terrace flat t, as above. 

 V, valley near Santa Barbara. 



b, c, d, e, uplifts of volcanic rock, the axes of the ranges. 

 /, g, g, sedimentary strata of Santa Barbara mountains. 

 h, i, San Rafael beds. 



PLATE IV. 



Fig. 1. — View of the Gaviote pass, looking south, showing the slope of the strata forming a 



synclinal axis. 

 Fig. 2. — Ideal section of the same ; a, b, representing the portions removed. 

 Fig. 3. — Section of asphalt cliff on shore near Santa Barbara, a, a, a, a, a, veins of asphalt ; 



b, beds with present shore shells ; c, outflow of bitumen on the surface ; x, clifi' extremity 



forming cape of bitumen. 

 Fig. 4. — View of the terrace cliff with asphalt, as seen from shore, x represents the cape as 



at Fig. 3, X. 

 Fig. 5. — Section from Point Dumas to the granitic mass of San Emilio. This section cuts the 



Sierra Monica and Sierra Susanna, crosses the valleys Triompho and Semee, and touches 



the Santa Clara at Camul. 



