MODELS The peg model is a device sometimes used to 



illustrate and study structural and stratigraph- 

 Peg Models ic conditions during the development of oil 



fields. It enables the geologist to view the 

 behavior of the formations in three dimensions and is often a most useful tool 

 in solving knotty structural problems. Peg models are not ordinarily used in 

 broad regional work, especially where wells are widely separated, but are better 



'\/ X/ \/ X/ N.' \ 



Figure 24-44. Generalized lithofacies map showing granite uplifts of different ages. 



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