"2 



PROCEEDINGS OF THE AMHERST MEETING 



6. Large geological models of the Black Hills have been constructed 

 by the South Dakota School of Mines, but are so large and expensive as 

 to be impracticable for class-room purposes. 



7. A geological model (figure 12) of the Greylock (Massachusetts) 

 synclinorium has proved of considerable value in teaching. 



8. D. B. Dowling, of the Canadian Geological Survey, has made a num- 

 ber of excellent geological-geographical models of the western plains and 

 Rocky Mountains of Canada. They are rather large for lecture demon- 

 stration, but parts of several of them, if made of suitable size, would be 

 of great value in teaching. 



Figure 13. — Model of a Mexican Oil Field 



This model shows the top surface of the oil-bearing formation and the salt-water con- 

 tacts at different periods in the pool's history. The celluloid top represents the surface 

 of (he region. Made by L. G. Huntley. 



!). P. I). Adams some years ago constructed a model showing the Mon- 

 treal Hills, which illustrates dikes and other igneous phenomena. This 

 model is one which, in some such form as that recommended above, would 

 be of value in teaching. 



10. The Shaler-Davis models, sold by Ward's Natural Science Estab- 

 lishment, are so well known that they need no description. 



11. a. A model (figures 13 and 14) showing the structural features of 

 a Mexican oil field (Tepetate-Chinampa), recently made by L. G. Hunt- 

 lev lor use in court, is unusually well suited for demonstration purposes. 

 The model consists of a subsurface section showing the folding in the 

 Tamasopa Limestone, on the top surface of which is drawn the oil-water 



