48 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



horizon of the true Knoxville, which for lack of a better 

 name is here designated as the sub-Knoxville. Below the 

 Knoxville (Paskenta) horizon in the Tehama and Shasta 

 sections there are at least 15,000 feet of conformable strata 

 from which but few organic remains other \}i\2Ln Aucella have 

 been obtained. It is not yet possible to say where the exact 

 limits between this and the Knoxville horizon may be drawn, 

 and indeed it may not be possible to establish one more than 

 theoretically in these sections. Still there appears to be 

 quite sufficient evidence thatthe Knoxville, as here restricted, 

 was inaugurated by some profound movements, felt else- 

 where, if not in this basin itself. 



The sub-Knoxville horizon, that here forms at least one- 

 half of the entire conformable series, has not yet been 

 clearly recognized outside of the Sacramento Valley, either 

 in California or Oregon. Nearly, if not quite all the occur- 

 rences of Aucel/a-hQaring rocks in the Coast Ranges have 

 shown themselves by their fossil remains, other than 

 Auce//a, to belong wholly to the Knoxville (Paskenta) 

 horizon, and have not been shown to exceed it either in 

 thickness of strata or in faunal contents. If the sub-Knox- 

 ville horizon has really any equivalent in other portions of 

 the State, they ought to be found outside of the borders of 

 the Great Valley, beyond the margins of recognized Cre- 

 taceous deposits; and it is not unlikely that some of the 

 stratified rocks of the Klamath Mountains will prove to be 

 their complete contemporaries. 



VI. Disturbances of the Period. 

 I. Distribution of the Horsetown Beds. 



In dealing with the two horizons of the Chico an attempt 

 was made to show the wide-spread disturbance that had 

 intervened and which was locally accentuated. The evi- 

 dence for this was first a considerable faunal change in 

 passing from Lower to Upper Chico, and second a general 

 lack of coincidence in the distribution of Upper and Lower 



