ABSTRACTS OF PAPERS PRESENTED 71 



The meeting then adjourned to meet in conjunction with the Le Conte 

 Club and Paleontological Society at the annual dinner Friday evening, 

 and again met in regular session Saturday morning at a. m. 



At the dinner Friday niglit, held at the Faculty Club, Berkeley, Prof. 

 H. F. Keid presented tlie following paper: 



XOTE ON MOUNTAlN-PRODUCi:^Q FORCES 



(Abstract) 



The recent work of Doctor Hayford in proving the practical existence of 

 isostasy shows that the elevation of mountains can not be ascribed to the 

 accumuhition of material by lateral pressure or by flow from below, but must 

 be due to the expansion of the region under the growing mountains. These 

 vertical forces are apt to cause normal faults near the boundaries of the rising 

 area, and normal faults thus produced are very steep and in some cases are 

 accompanied by tangential pressure. 



This was followed by general discussion. 



J. C. Merriam also presented the following: 



SUGGESTIONS AS TO DEFINITIONS OF TERMS USED IN DESIGNATING UNITS 



OF GEOLOGICAL CLASSIFICATION 



This also produced a general discussion. 



Session of Saturday, April 1 



The meeting was called to order at 9.45, in room 22, South Hall, and 

 proceeded with the program. 



In the absence of the writer, the following paper was read by title by 

 the Chairman : 



TERTIARY DEPOSITS OF OAHU 

 BY C. H. HITCHCOCK 



(Abstract) 



As a result of the study of more than four hundred artesian wells, it can be 

 definitely stated that Tertiary deposits exist on Oahu between Koko Head and 

 Barkers Point, and underlying several famous sugar plantations besides the 

 city of Honolulu, and extending more or less entirely around the island, rising 

 as nuu-li as 300 feet al)ove the sealevel. The deposits consist of sand, conglom- 

 erates, clays, limestone, and sundry volcanic products resting on the hard 

 basalt floor and perhai)s a thonsand feet thick and designated the Pearl Harbor 

 series. Fossils indicate the Pliocene age. The later geological history of the 

 island is outlined and an explanation given of the origin of the artesian waters. 



