34 HAEHL AND AENOLD— THE MIOCENE DIABASE. [Feb. 5, 



inch to over thirty feet, and from a few inches to at least one hun- 



0' zoo' 400' 600 



Fig. 15. Northwest-southeast vertical section exposed on ridge north cf the 

 Langley ranch house, showing limestone layers interbedded with, and lime- 

 stone dikes intrusive in, the diabase tuff. 



dred and fifty feet in length. Some of them show a kind of flow 

 structure ; and a few of them show two systems of joint planes at 

 right angles to each other and both perpendicular to the surfaces 



Wesl- 



Fig 16. Vertical section showing detail of tuff containing limestone dikes, found 

 on the ridge north of the Langley ranch house. Taken from sketch made 

 in the field. 



