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                           REFERENCES                                           
                                                                                
Berggren, W.A., 1972, A Cenozoic time-scale--some implications for regional     
  geology and paleobiogeography:  Lethia, v. 5, no. 2, p. 195-215.              
                                                                                
Boyer, R.E., 1962, Petrology and structure of the southern Wet Mountains,       
  Colorado:  Geol. Soc. America Bull., v. 73, no. 9, p. 1047-1070.              
                                                                                
Chronic, B.J., Jr., 1958, Pennsylvanian rocks in central Colorado, in Rocky     
  Mt. Assoc. Geologists, Symposium on Pennsylvanian rocks of Colorado and       
  adjacent areas, p. 59-63.