Subsurface Laboratory Methods 



169 



are additional uses, and with the advance of the science still others will be 

 found. 



From magnetically oriented drill cores (see "Magnetic-Core Orienta- 



■^■*i 



i '■' #'- 



Figure 66. Looking along b axis of an isoclinal fold in the same white quartzite as 

 shown in figures 62-65. The schistosity and the bedding planes intersect at a 

 low angle and produce prominent lineation as shown in detail in figure 67. 



tion") oriented thin sections can be obtained. The statistical analysis of 

 such thin sections tied in with other known petrofabric data will help 

 work out subsurface structures. 



Hohlt,^^ in a recent paper on limestone porosity, made statistical 

 studies of carbonate rocks with the idea of correlating mineral orientation 

 and porosity. He concluded that orientation is related to dolomitization. 



^' Hohlt, R. B., The Nature and Origin of Limestone Porosity: Colorado School of Mines Quart., 

 vol. 43, no. 4, Oct. 1948. 



