PAPERS PRESENTED 97 



roded by the ore-bearing solutions. Many angular fragments of the andesite 

 have been included in the ore near the foot wall and ramifying veins of ore 

 extend out into the andesite. Many of the smaller fragments of andesite have 

 been altered to phlogopite and occasional veins of the latter occur in the ore. 

 Apatite in microscopic crystals is disseminated through the ore body, and near 

 the foot wall is often segregated in nodules and small veins. Limonite, cal- 

 cite, and quartz of secondary origin are the only other minerals occurring in 

 the ore. The ore body is evidently a metasomatic replacement of the andesite 

 by hematite, magnetite, and apatite introduced by heated solutions intimately 

 connected with igneous activity and presumably closely following the solidifi- 

 cation of the andesite. 



Presented in abstract from notes. Discussion by Louderback and 

 Rogers. 



VENTURA COUNTY OIL FIELDS 

 BY ROBERT W. MORAN 



(Abstract) 



The paper dealt with the stratigraphy and some structural details of the 

 region. It also touched on the possible origin of the oil. 



Presented from notes; illustrated with maps and lantern slides. Dis- 

 cussion by Louderback and Clark. 



THE OLDEST FOSSILS 

 BY ANDREW C. LAW SON 



Read from manuscript, and illustrated by maps and specimens. Dis- 

 cussion by Branner and Merriam. 



Published in Memoir No. 28 of the Geological Survey of Canada, 1912. 



The meeting adjourned at 5.45. 



ANNUAL DINNER 



Friday evening at 6 o'clock, at Stanford Inn, the section held its an- 

 nual banquet in conjunction with the Le Conte Club and the Paleonto- 

 logical Society. After the dinner the following paper was presented and 

 discussed : 



VII— Bull. Geol. Soc. Am., Vol. 24. L012 



