Geol.— Vol. II.] ANDERSON— STRATIGRAPHIC STUDY I'JI 



Miocene strata describe a broad curve around the eastern 



side of the Sunflower Valley, but at most points only the 



Monterey Shales are visible. On the northern border of the 



Sunflower Valley, at Tar Springs, the Miocene section is 



about as follows : 



ft. 



Monterey Shales 900 



Temblor Sandstones with fossils 800 



White sandy shales 400 



Total 2100 



This section is representative of the Miocene occurrences 

 at most points between the Antelope Valley and Alcalde 

 Creek. The Miocene rocks rest indiscriminately upon the 

 Eocene, the Cretaceous, or older rocks as the case may be, 

 though not always with an appearance of unconformity. 

 The dip is always toward the Great Valley at some angle 

 between 20° and 90°. At Tar Springs the dip is above 75°. 

 At the Devil's Den on the south side of the Sunflower 

 Valley the dip is in some places anticlinal, and to the west of 

 the valley the Monterey Shales rise upon the flanks of the 

 main range, overlying the Cretaceous without any appear- 

 ance of the Temblor Beds. 



The topographic aspect of the Temblor Beds is striking. 

 They stand out in bold relief along the whole range from 

 McKittrick northwestward to near Coalinga, and form a 

 species of serrated wall along the front of the hills through 

 which the canyons emerging into the Great Valley have cut 

 their ways. This is particularly noticeable along the north- 

 ern border of the hills extending west from Tar Springs, and 

 in many other parts of the country. This feature is shown 

 in some degree on plates xxviii and xxix. 



The following fossil species have been collected from the 

 Temblor Beds at different points : 



Tar Springs. 



Sciitella sp. Neverita callosa Gabb 



Astrodapsis nierriami n. sp. Dosinia ^natheivsoni (?) Gabb 



Pecten discus Conrad Crepidiila praerupta Conrad 



Pec ten crassicardo Conrad Ballanus sp. 



Turritella ocoyana Conrad 



[2] November 28, 1905 



