Volume 15 Number 11 
BULLETIN 
of the 
AMERICAN ASSOCIATION OF 
PETROLEUM GEOLOGISTS 
NOVEMBER 1931 
Symposium on Geophysics 
EDITOR’S FOREWORD 
In 1929, five major articles on geophysics were published in the 
Bulletin. In 1930, fifteen geophysical papers were printed, including 
two on geothermal gradients. Eight of these fifteen papers appeared 
in the September number, but the other seven were distributed through 
five other monthly issues. This year we have made an effort to concen- 
trate all the strictly geophysical contributions in the November and 
December numbers. 
These papers, which follow, were presented in March, 1931, before 
the Society of Petroleum Geophysicists at the annual convention of The 
American Association of Petroleum Geologists at San Antonio. Together 
with a few others, not now available, they constituted the geophysical 
group of the Association’s technical program. They were solicited largely 
through the efforts of the program subcommittee, consisting of H. A. 
Aurand, O. C. Lester, D. M. Collingwood, George M. Bevier,-Paul B. 
Whitney, and G. H. Westby, chairman, all members of both the Society 
and the Association. To these gentlemen, and especially to Mr. Westby, 
we wish to express our thanks for their codperation in making the program 
a SUCCESS. 
Geophysics is an important tool for helping to decipher the intricate 
and hidden conditions of the earth’s interior. It is an important branch 
of geological investigation. The real significance of its data can not be 
satisfactorily interpreted except in the light of geology. We therefore 
concur with Mr. Westby in his invitation, included in his introduction, 
for codperation between geophysicists and geologists; and we wish to add 
encouragement to the geophysicists to contribute more papers on this 
important subject. 
F. H. LAHEE 
1307 
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