436 



University of California Publications. 



[Geology 



a mile above Cameron station. The trench is a new feature of 

 the topography and was cut by the exceptionally heavy run-off 

 due to the rains of the winter of 1904-5. The trench is 13 feet 

 deep below the floor of the valley. In the bottom of the trench 

 there is exposed a dark gray or drab-colored, stiff clay with 

 remains of plant stems in it, to a thickness of 3 feet. Upon this 

 clay with a sharp horizontal contact rests 10 feet of the ordinary 

 alluvium of the valley, consisting of light colored granite sands 

 with lenses of gravel. The contrast of this sandy and gravelly 

 alluvium with the underlying stiff clay is significant of a change 

 in the conditions of deposition. This contrast is the more signifi- 

 cant when it is stated that the exposure occurs in the narrowest 

 part of the valley, practically in its outlet to Mohave, the width 

 of the floor here being only 200 yards, between steep rocky walls. 

 It would be interesting to know the thickness of the clay, but 

 unfortunately this could not be ascertained. 



Remains of Mammoth. — About a mile and a quarter to the 

 westward of Tehachapi station on the line of the railway, certain 

 trenches were cut by the Southern Pacific Railway Company for 

 the purpose of developing a supply of water for one of their 

 tanks. In this work a large bone was found and was forwarded 

 to the University of California by Mr. de Heur, the resident 

 engineer of the company at Bakersfield. The bone has been 

 identified by Professor J. C. Merriam as the tibia of a mam- 

 moth.* The writer subsequently visited the locality under the 

 guidance of one of the workmen who was present when the bone 

 was found. The trench is now boxed in, but enough of the section 

 was seen to establish the fact that it cut through about eight 

 feet of black adobe clay, then through three feet of yellow clay. 

 This yellow clay rests upon gravelly alluvium, the rock frag- 

 ments of which are angular and little water worn, and range in 

 size from minute fragments with sand up to pieces the size of 

 one's fist. The depth of this gravelly alluvium is not revealed. 

 The mammoth bone was found at a depth of between 11 and 

 12 feet, or just below the yellow clay. The yellow clay and the 

 gravelly alluvium represent with little question the lower edge 



* This is now in the Collection of Vertebrate Palaeontology, Univ. Calif. 

 Accession No. 9842. 



