. Oil and gas yielding formations of California. Section showing strata inclosing oil-iand Oil-lines formed by 23. 192 CALIFORNIA STATE MINING BUREAU. jected. In the movement which occasioned the faulting or folding,deeply buried strata are more likely to be folded than to be fractured orfaulted; while with less deeply buried strata the reverse is the case. Inmost instances beds of soft material are likely to be more crumpled andfolded at acute angles than are harder rocks, but where the hard rocksare thin-bedded they are often as severely crumpled as the softer
. Oil and gas yielding formations of California. Section showing strata inclosing oil-iand Oil-lines formed by 23. 192 CALIFORNIA STATE MINING BUREAU. jected. In the movement which occasioned the faulting or folding,deeply buried strata are more likely to be folded than to be fractured orfaulted; while with less deeply buried strata the reverse is the case. Inmost instances beds of soft material are likely to be more crumpled andfolded at acute angles than are harder rocks, but where the hard rocksare thin-bedded they are often as severely crumpled as the softer rocks. In many localities the rocks are found to be affected by morethan one order of folds. In most instances we find dominant foldswhich have controlled the prevailing strike and dip of the formation,and cross-folds which have a different strike to that of the dominantfolds. At points where the cross-folds strike the axes of the dominantfolds, the tendency is to form dome-like elevations, or to occasion a greatcomplexity of structure by plication and fracture. The foregoing remarks
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