Vol. IV] ANDERSON AND MARTIN— NEOCENE RECORD 29 



range could be carried is not known, but it is sufficient for the 

 present purpose to point out the fact that there are separate 

 orogenic blocks within the southern portion of the range. Two 

 important results of this breaking up of the range may properly 

 be noticed here, though the full treatment of the subject must 

 be deferred. 



The first point of importance is the accord shown between 

 the displacements due to thrust-faulting, and the folding, or 

 wrinkling of the strata. In the case of the Avenal block, lying 

 to the north of the Antelope Valley, the tangential shortening 

 of the section is effected by folding on the eastern side of the 

 range, as is seen in the anticlines and synclines about the Sun- 

 flower Valley and the Kettleman Hills. In the case of the 

 Temblor block the shortening has taken place mainly on the 

 Carrizo side of the range, as is to be seen in the anticlinal fold- 

 ing in the San Juan district, though to a less degree on the 

 eastern side in the high inclination of the Miocene strata along 

 the eastern slopes. In what may be known as the McKittrick- 

 Midway block the folding and shortening is again largely on 

 the eastern side of the range, as may be seen about these oil 

 districts in the various anticlines and synclines as already 

 stated. 



Had the strata of the San Juan district been sufficiently 

 rigid to have withstood the thrust from the southwest without 

 crumpling, the Temblor Range would have been carried far- 

 ther eastward, with the development of greater or more numer- 

 ous folds on the eastern flank. 



In accord with this the offsetting of the strata would have 

 been much less along the transverse fault line, bounding this 

 block on the north. 



The second point of importance to be noted in connection 

 with the breaking up of the range into orogenic blocks is the 

 separate and independent vertical movements noticeable in the 

 case of each. For just as there have been differential horizontal 

 movements with respect to each other, there have also been 

 vertical movements, showing the general independence of each 

 orogenic block. This is shown in the well known discrepancies 

 in the Neocene stratigraphic sequences of the various blocks, 

 but the subject is too large to receive an extended treatment 

 here. 



