PART II. 



SECTIONS. 



CHAPTER I. 



i 



GEOLOGICAL SECTIONS. 



Dip Strike Clinometer To find direction of Dip To find 

 amount of Dip Table of Dip, depth and thickness Exposed 

 Sections Notes. 



Dip. Strata are but rarely found in an absolutely hori- 

 zontal position; it is indeed mainly owing to their 

 deviation therefrom that so many formations are now 

 seen outcropping at the surface of the earth. A know- 

 ledge of the angle at which they are inclined is of great 

 service to the geologist when drawing horizontal sections 

 to show the beds of a district, and in enabling him to 

 afrlrm, within reasonable bounds, the thickness of a 

 deposit and the depth at which it will be found in any 

 specified locality. The angle at which a bed deviates 

 from the horizontal is its " angle of dip," generally and 

 for sake of brevity called simply its " dip." A line passing 

 from any point on the surface of a bed through another 

 point which is the lowest possible at that distance from 

 the first in other words, the line of greatest steepness 

 represents the dip's direction. 



