74 DIFFERENT CONDITION OF DEPOSITION. 



and Ostrea Titan, show that they may not have been under like circumstances of depth or deposit. 

 It is still further removed from the groups of Santa Margarita, having only C^/cZo.? and Balanus 

 in common. As both Panza and Margarita now occupy positions several hundred feet above 

 the Gaviote beds, they may, even in the period of deposition, have been on a more elevated base, 

 and as the deposits were from the east and north, they may have so thinned out in the deep 

 waters as to leave but slight representatives. All the strata appear to thin out towards the 

 south ; the sandstones, of Santa Inez range at Gaviote are apparently much thicker than at 

 Buenaventura. 



