ABSTRACTS OF PAPERS 59 



relation to the sub- Pacific mass ; their Interpretation as effects of persistent 

 suboceanic spread. 



These two papers by Bailey Willis were presented together extem- 

 poraneously. 



Discussion 



Dr. George H. Ashley: As a result of detailed studies in 1906. 18 terraces 

 were traced on San Pedro Hill, and terraces followed around the ends of the 

 hill, so as to leave no doubt of their terrace character. Again, near San Fran- 

 cisco, on the east side of the San Andrews fault, is a raised block, raised on 

 the west, the Pleistocene deposit sloping to the east from 700 feet above the 

 sea at the fault and passing below the bay on the east. 



Eemarks were also made by Messrs. A. C. Lawson and E. T. Hill, witli 

 reply by the author. 



Author's reply to Prof. A. C. Lawson : The terraces north of Santa Cruz are 

 correctly described by Professor Lawson as being level, so far as the two lower 

 terraces are concerned. They have been worked over by the sea and exhibit 

 the effects of wave erosion and deposition. The higher terraces are much less 

 well marked, are discontinuous and eroded. I would not like to say categoric- 

 ally that they are or are not level, since individual judgment must enter into 

 the identification of various benches as more or less surely belonging to the 

 same terrace. I agree with Dr. Ashley that the terraces on San Pedro Hill 

 are marine. They are some 400 miles from Santa Cruz. 



LATE TERTIARY AXD QUATERXARY DIASTROPHL^M IN SOUTHERX CEBU, 



PHILIPPIXE ISLAXD8 



BY GEORGE D. LOUDERBACK AXD R. R. MORSE 



(Ahstraet) 



The late Tertiary rocks are markedly deformed by faulting, with the pro- 

 duction of hoist and graben forms. Geologic sections wall be shown illustrat- 

 ing the character of the faulting and its variation along the strike. The recent 

 diastrophic history is outlined and its effects in the production of faultscarps 

 and marine terraces described. Faulting is believed to be an important process 

 in the production of the island. 



Presented extemporaneously. 



PARALLEL FOLDfi AXD BOUDJXAGE 

 BY TEREXCE T. QUIRKE 



(Ahstrart) 



Parallel folds die out, both upw^ard and downward, by interference of neigh- 

 boring folds and by the approach of curvature to a straight line. Theoretic- 

 ally, they would die out at infinity, but the folding is almost nothing at a dis- 



