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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 Gyclas 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 hut 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. 
