DESCRIPTION OF THE PLATES, 
199 
PLATE II. 
Fig. 1.—Section of the beds marked e, figure 4, plate I. These are the most recent beds in the 
valley Santa Margarita. 
a, a, a, the valley level with alluvium. 
A, B, C, the three hills containing the fossiliferous beds, dipping S.W. ; at b the agatic or 
flinty layers occur 16 inches thick. 
1, 1,1, calcareous layers of comminuted shell and large shells of Ostrea titan ; this is the first 
bed of chapter 5. 
The second bed, B, has at 2 a broken shell bed, with specimens of Ostrea and Hinnites. The 
third bed is represented at 0 , where 3 shows the Ostrea and Hinnites bed, and 4 the Ostrea 
and Astrodapsis , with Pecten discus. 
At C 5, the upper layer of sandstone, pierced by pholadines, is situated. 
Fig. 2. Section of the Santa Lucia mountains. This section was taken where the Santa Maria 
river canons through to reach Guadalupe Largo. The rock apparent in the axis is 
serpentine, s, s, which is here made to repose on granitoid rock, although no granite was 
actually observed. The serpentine is cut through by dykes of augitic rock. Conform¬ 
able to the serpentine on each side is, 1, thick beds of conglomerate, similar to that 
underlying Santa Margarita valley. 2 and 3 are the brown and yellow sandstones of the 
same age with the Gavilan and Salinas valley beds. 
Fig. 3.—Section of Greater Panza hill; the lesser hill is similarly constituted. They lie with 
their greatest length 1ST.W. and S.E. ; the upheaving rock, g, quartzose granite, lying at 
the southern end ; e, brown sandstones similar to those of Santa Barbara ; /, an interval, 
not observed, probably the heavy conglomerate ; b, c, d, coarse and fine grits and sand¬ 
stones with views of gypsum and limonite. 
a 1 represents the beds containing Ostrea , Pallium and Astrodapsis, (be. 
a 2 is the soft argillite, with casts of Area. 
Fig. 4.—Outline of Santa Maria valley, with its terraces, from near ranche Cuatro Domingo. 
A, the western slope of the San Jose mountains ; C, the slopes of the Santa Lucia ; B, the 
intervening insular mass of strata, a part of the San Josd range, from which it is 
separated by denudation ; D, present valley of the Santa Maria ; E, ancient water bed; 
D 1, present river bottom and first terrace ; 2 and 3, terraces above, the upper one corre¬ 
sponding to the summit of the central islet and somewhat below the terrace level on the 
Santa Lucia, 4. 
Fig. 5.—Section of the San Jose mountain range, taken from valley San Jose across to Panza 
ranch and valley ; still more to the east lies Panza hill. The axis of this range is the 
felspathic granite with epidote, g ; uplifting the conglomerate, f s on each side, this bed 
forms the summits of the hill range ; e, green gritty sandstones, fine texture ; d , coarse 
conglomerate of porphyry and jasper of a reddish tint; c, brown and yellow sandstones, 
similar to those of Gavilan and Salinas valley ; b, a bed of green conglomerate made of 
serpentine and quartz pebble ; a , whitish sandstones and layers of arg llite, with gypsum 
remains of Ostrea and Pallium. 
