158 PROCEEDINGS OF THE ALBANY MEETING 



satisfactory answers. The writer of this paper undertakes to consider a few 

 points which have arisen in his own experience and that of his associates, 

 trusting that the paper will secure discussion which will warrant tacit recog- 

 nition by the Society of a suitable code of ethics for petroleum geologists. 



■ Presented in abstract from notes. 



REVISION OF STRUCTURAL CLASSIFICATION OF PETROLEUM AND NATURAL 



GAS FIELDS 



BY FREDERICK G. CLAPP 



(Abstract) 



The original paper, which proposed a "Classification of petroleum and nat- 

 ural gas fields based on structure," was published in Economic Geology in 

 1910, having been presented in brief before the Geological Society at Washing- 

 ton earlier in the same year. During the intervening six years geological ex- 

 amination of oil fields has grown from a new branch of engineering into one 

 which is now generally recognized as essential to efBcient oil development. 

 Few real changes have been necessary in the classification as originally pro- 

 posed, but a number of additions have been made, and it has lately been neces- 

 sary to further subdivide the classification. In the present paper this is car- 

 ried as far as is practicable at the present time ; and, to make the classification 

 comprehensive, a large number of additional examples are given of fields 

 where the respective types of structure exist. 



Presented in abstract extemporaneously. 



INTERMOLECULAR ATTRACTIONS AND OIL AND GAS ACCUMULATION 

 BY EUGENE WESLEY SHAW 



(AT)straGt) 



A review of the literature discussing the ages of the widely known peneplains 

 of the Appalachian province brings out the fact that notions concerning their 

 age are discordant, and an examination of published and unpublished data 

 leads to the inference that the peneplains are as young or younger than the 

 latest date so far assigned. For example, the so-called Cretaceous peneplain 

 is assigned by various writers to pre-Cretaceous, Lower Cretaceous, Upper Cre- 

 taceous, and early Tertiary time. The best basis for dating surfaces regarded 

 as remnants of this peneplain seems to be obtained (1) by correlating them 

 with unconformities or deposits in the coastal plain and (2) by the amount 

 of erosion to which they have been subjected. The result seems to suggest 

 that such surfaces are not much older than Middle Tertiary. 



Presented in abstract extemporaiieoiisly. 



RELATION OF STRUCTURE TO THE PRODUCTION OF OIL AND NATURAL GAS 

 IN THE MID-CONTINENT FIELD 



BY CHARLES N. GOULD 



Presented in abstract extemporaneously. 



