. Oil and gas yielding formations of California. Hopjser Canon FIG. II CROSS SECT/ON ffe/A//^/A/G N. /O W. ^/poa^ THE /P. /?. BR/DGE /7T P/Ra TO N. P/RL/PEA /T ^^^ 3c^le:960 Vos. ^ RBf^/OG£ X, T.^Af. /?. /a M< ^.B. M. c ^^ f/ D I MOOELLOCf^ 88 CALIFORNIA STATE MINING BUREAU. Station 122 is on a ridge which rises to an elevation of more than188. This ridge is capped with sandstone, which lies on the siliciousshale formation in the syncline between fold BB and a short fold markedEE in Fig. G, which latter fold lies farther to the north. BetweenStations 121 and 113 the formation is
. Oil and gas yielding formations of California. Hopjser Canon FIG. II CROSS SECT/ON ffe/A//^/A/G N. /O W. ^/poa^ THE /P. /?. BR/DGE /7T P/Ra TO N. P/RL/PEA /T ^^^ 3c^le:960 Vos. ^ RBf^/OG£ X, T.^Af. /?. /a M< ^.B. M. c ^^ f/ D I MOOELLOCf^ 88 CALIFORNIA STATE MINING BUREAU. Station 122 is on a ridge which rises to an elevation of more than188. This ridge is capped with sandstone, which lies on the siliciousshale formation in the syncline between fold BB and a short fold markedEE in Fig. G, which latter fold lies farther to the north. BetweenStations 121 and 113 the formation is silicious shale, which, in thislocality, constitutes the south limb of fold EE, the dip being east of southat an angle of about 56°. At Station 113, the axis of fold EE is is probably a fault at this point, for the rocks are decomposed bysulphureted vapor and impregnated with bituminous matter and sulphur;on the north limb of this fold the formation is sandstone. Farther tothe north, another short fold is shown, marked FF. This fold hasa more northerly course than folds EE and BB. Both limbs of fold FFare formed of sandstone, but it is said that in the Fortuna oil-wells,which are situated on this fold, a silicious shale resembling
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