Raymond — Upper Devonian Fauna with Clymenia.. 117 



Division 3 is subdivided as follows : — 



D. Yellow sandstone, the lower part calcareous, ... 25" feet. 



C. Coal-black shale, 5 feet. 



B. Gray limestone, ._ .. 10 feet. 



A. Green shales with bands of limestone, 30 feet. 



Zones A, B, and D were described as fossiliferous, and Dr. 

 Walcott identified 39 species from the collections made by 

 Peale. 



In 1895, while Mr. Douglass, now of the Section of Paleon- 

 tology, Carnegie Museum, was collecting in the Tertiary deposits 

 near Three Forks, he was shown specimens of Spirifer disjunc- 

 tus. The gentleman who had these fossils later conducted Mr. 

 Douglass to the locality from which they were obtained, and 

 on this and succeeding visits Mr. Douglass collected the follow- 

 ing fossils, which have been identified by Dr. George H. 

 Girty* :— 



Spirifer disjunctus, Pugnax pugnus, 



Cleiothyris sp. nov., Goniatites (2 sp.). 



Camarotoechia tethys, 



In September, 1905, Mr. Douglass and the writer visited 

 this locality and obtained a large collection of fossils from 

 the upper shales. The writer also made a collection from the 

 Devonian ravine opposite Logan. These have been identified 

 only provisionally, as a large number appear to be new and 

 require more study than it has yet been possible to devote to 

 them. It is thought, however, that the novelty of this fauna 

 and its important bearing upon the problems of the distribu- 

 tion of Paleozoic lands and seas will justify this preliminary 

 note. 



In the 65 feet of strata constituting the upper shales at 

 Three Forks, there are five zones in which the lithology and 

 faunules differ somewhat. 1, 2, and 3 make up A above ; 4 is 

 the same as B ; and 5 .equals D. From C no fossils were 

 obtained. These zones, beginning with the lowest, are as fol- 

 lows : — 



1. Red shale zone. — The shales of this zone are hard, red- 

 dish, and fissile, the layers weathering into small sharp-pointed 

 fragments. The fossils are preserved in pyrite, which is often 

 partially altered to limonite, and thej T weather out on the sur- 

 face in numerous bare spots along the strike of the beds. A 

 set of fossils from this zone was sent to Dr. E. Holzapfel, 

 whose determination of the species is quoted below : — 



Orthoceras, 3 species, 



Orthoceras, similar to 0. gregarhim Miinst., 



Bactrites sp. 



* Notes on the Geology of Southwestern Montana, by Earl Douglass. 

 Annals Carnegie Museum, vol. iii, p. 416. 



