30. 
PETROGRA PHY 
Clay minerals, The clay mineralogy of three cores ds being 
stucied by Dr, Maurice C, Powers, the Johns Hopkins University, Bal- 
timore, Top and bottom samples of two of the cores (location: 37°01 1/2! 
N. 74°27 3/4'W and 36°08'N, 68°55'W) have been analyzed, Ina letter to 
the laboratory Dr, Powers came to the following conclusions: 
"All of the samples contain the same type and amount of clay 
minerals, There may be just a slight trace of kaolinite present, but the 
dominant minerals are an illite and a chlorite-like material, The chlor- 
ite-like mineral may be forming from a montmorillonoid or a degraded 
illite or chlorite. I have been able to definitely establish that the chlorite- 
like mineral becomes stable to higher temperatures as distance from 
shore is increased, The increase in thermal stability with distance from 
shore is almost certainly due to a more perfect organization and growth 
of the chlorite crystal, I may summarize by saying that the sample con- 
sists of clay-size quartz particles (less than 10%), illite (about 30%), and 
a "swelling" chlorite mineral (60%),." 
A series of photographs of samples from nine cores has been 
made at the Electron Microscope Laboratory, Columbia University. 
Mr, Abdullah Sayyeb of the Department of Geology, Indiana Uni- 
versity, is studying a series of samples from five cores by means of com- 
plete mineralogical analyses of the clays and sands, 
Series of samples from six cores are being studied by Mr, M, N, 
Hill, Department of Geodesy and Geophysics, Cambridge University, Eng- 
land, He is investigating the physical properties of deep sea clays, 
