Vou. 111] ANDERSON—NEOCENE DEPOSITS OF KERN RIVER 105 
by the diastrophic movements of the period. As will be shown 
later, the conditions, if not the area, of marine deposition were 
greatly altered during Mid-Neocene—that is Monterey—time 
by wide-spread disturbances. 
As stated before, the Mt. Diablo Range divides ‘he Temblor 
basin somewhat centrally. Around the several island cores 
of this range the Neocene sediments cluster more or less con- 
tinuously in concentric zones. The thickest and probably the 
most normal, if not the most varied, development of the Neo- 
cene is about what is locally known as the Temblor Mountains, 
and it is this portion of the Mt. Diablo Range that is most 
central to the basin here described. For these reasons, and 
also because the oldest beds of the Neocene, those known as 
the Temblor Beds, more accurately than any others delineate 
the extent and area of marine conditions, the basin may be 
appropriately known as the Temblor Basin. 
About this basin, as already described, the summits of the 
various coast ranges lift their heads as boundary or interior 
monuments, well fitted to commemorate the existence of an 
object so important. For this basin forms in truth one of the 
most important unit-areas of the California Neocene, and 
should be treated as such in any extensive and consistent study 
of the deposits. 
It is not believed that the various coast mountains existed 
as continuous ranges during the Neocene, but rather as chains 
of disconnected islands intermittently bounding the basin on 
the south and west, and also dividing it somewhat centrally 
in the position of the Mt. Diablo Range. About these several 
islands, in the wide inter-island channels, in the narrower 
waterways, and in the inclosed sea, the range of conditions, 
when affected by ocean currents, was very great, both as to 
sedimentation and as to the distribution of faunas; and it is 
only in view of these facts that correlations can be advantage- 
ously undertaken, either of deposits within this particular 
basin, or of deposits occurring respectively in this and neigh- 
boring basins, or of either with the standard column of the 
California Neocene. 
Below is given a tabulated statement showing in a general 
way the plan suggested for the correlation of the Kern River 
November 1, 1911 
