ABANDONMENT OF THE MARTINEZ GROUP. 253 



tains, Ashland, and several places in Jackson county, indicate about the 

 same horizon as that of the bed at Horsetown. 



Original Localities of Chico Fossil*. — In the second volume of the Pale- 

 ontology of California there is a " Synopsis of the Cretaceous invertebrate 

 fossils of California/' giving a complete list of the species then known, 

 with the localities at which they had been obtained. For convenience 

 in making comparisons I have made a list of the species reported from 

 each locality there mentioned. Leaving out of consideration the locali- 

 ties from which only from one to three species are reported, there are 

 sixteen localities from winch Chico fossils were obtained. An examina- 

 tion of the faunal lists from these places show that eleven of them may 

 be referred without question to the Shasta-Chico fauna as represented at 

 Horsetown and in the neighborhood of Cottonwood creek. These local- 

 ities are: Benicia, Cottonwood creek, Crooked creek of the Des. Chutes 

 (Oregon), Curry's. Jacksonville (Oregon), Martinez, mount Diablo, Ores- 

 timba, Pacheco pass, Siskiyou mountains and Tuscan springs. The 

 other five localities, viz, Chico creek, Cow creek, Folsom, Pence's and 

 Texas Flat, yielded a greater proportion of species not contained in Mr 

 Diller's collections from Shasta county, but there are several well marked 

 Horsetown species reported from each of these localities ; and they are 

 all so intimately related to the other Chico localities by means of species 

 held in common with one or more of them that they cannot be regarded 

 as belonging to another fauna. 



The Martinez group of Gabb has long since been abandoned as insep- 

 arable from the Chico ; and. as Mr Diller has shown in his paper on the 

 Cretaceous and early Tertiary deposits of this region,* the Wallala for- 

 mation probably also belongs in the same series. 



Faunas of Queen Charlotte and Nanaimo Formations. 



Correlation of Queen Charlotte Formation with the Shasta. — The correla- 

 tion of the Queen Charlotte formation (divisions C, D and E oi Dr Daw- 

 son's section) with the Shasta has already been mentioned in speaking 

 of Mr Whiteaves' work. The additions now made to the Horsetown 

 fauna materially increase the number of species that occur in both the 

 Shasta and Queen Charlotte formations. It should lie stated, however, 

 that several genera of ammonites found on Queen Charlotte islands and 

 not yet seen in the Shasta suggest a somewhat earlier period for the bed 

 in which they occur. It would simplify the matter if it could be proved 

 that these ammonites came from a lower horizon. It is worthy of note 



*Ante, pp. 205-224. 

 XXX!VIII— Bull. Geol. Soc. Am., Vol. 4, 1882, 



