Vol. IV] ANDERSON AND MARTIN— NEOCENE RECORD 21 



of petroleum, or where only stratigraphic resemblance allied 

 them to the oil-bearing formations in other districts. This 

 work has necessarily covered much territory outside of the 

 limits of proved or even prospective petroleum lands. But 

 nevertheless it has thereby led to a broader and better under- 

 standing of the stratigraphic conditions of the oil bearing 

 formations, and of other associated strata, above and below. 



However, not all of the work upon which this and subse- 

 quent papers are to be based was done as economic exploration, 

 for much of it in fact was done for purely scientific purposes, 

 or solely to extend the boundaries of geological and paleon- 

 tological information farther than it had heretofore been car- 

 ried, and to solve, or aid in solving some of the problems with 

 which these subjects abound. While the distribution and 

 correlation of the larger divisions of the middle Tertiary of 

 California are well known, there are, nevertheless, points of 

 interest in correlation which have not been finally settled, and 

 any additional knowledge that can be added seems fully worth 

 while. The familiar and much debated question of the relation 

 of the lower Miocene of the interior basins to those of the 

 coastal districts has interested the writers in areas inter- 

 mediate between the Kern River region, the most easterly 

 occurrence of lower Miocene within the Great Valley of 

 California, and the Salinas Valley where lower horizons are 

 supposed to occur. An area some twenty-five miles long and 

 approximately ten miles wide, stretching from Paso Robles 

 in the Salinas Valley southeast to the western border of the 

 Carrizo Plain, was examined and partly mapped, and studied 

 with a view to throwing light on this problem of correlation. 

 The results of this work, while not yielding all that was de- 

 sired, seem to warrant a brief description as to stratigraphic 

 relations, together with a faunal correlation as far as can be 

 made. 



The geology and faunas of some of the outer coastal districts 

 have been studied by H. W. Fairbanks, J. C. Merriam, Ralph 

 Arnold, and the present writers, while areas within the Great 

 Valley have been similarly studied by several workers, includ- 

 ing Ralph Arnold, Robert Anderson, H. R. Johnson, and the 

 writers. Meanwhile, the areas lying along the southern border 

 of the Temblor Basin west of the Great Valley and inter- 



