FAUNAS OF SOUTHEASTERN ALASKA 333 
The fauna of the Pybus Bay limestone is the same which has been 
previously referred to the Permian in Alaska. Dr. George H. Girty, 
to whom the writer is indebted for the determination of the horizons 
represented by the Carboniferous collections, states, however, that 
he finds 
that a greater resemblance exists with the Gschelian stage of the Russian section 
than with the Russian Permian. Provisionally, therefore, I will correlate this 
horizon with the Gschel-stufe, in which occur a great number of equivalent or 
identical species. This fauna is entirely unlike anything in the Mississippian 
province of the United States, but some of our western faunas resemble it. 
Fossils are usually abundant and well preserved wherever the 
Upper Carboniferous limestone is found. The character of this 
fauna is shown by the following list of the species collected at Pybus 
Bay, which has been furnished by Dr. Girty: 
Zaphrentis ? sp. Spirifer aff. S. allatus 
Fenestella sp. Spirifer n. sp. aff. S. marcoui 
Rhombopora sp. Spirifer n. sp. aff. S, dieneri Tscherny. 
Derbya sp. Squamularia sp. 
Productus aff. P. gruenewaldti Krot Hustedia sp. 
Productus aff. P. humboldti D’Orb Spiriferina aff. S. cristata Schlot. 
Productus aff. P. timanicus Stuck Cleiothyris sp. 
Productus aff. P. lineatus Waagen Camarophoria margaritovi Tscherny. 
Productus aff. P. mammatus Keys. Camarophoria aff. C. purdoni Davidson 
Productus sp. Dielasma sp. 
Rhynchopora aff. R. geinitziana Tsch- Cryptacanthia aff. C. compacta W. & 
erny. Sig fe 
Spirifer arcticus Houghton Aviculipecten sp. 
In the faunas of the Halleck Harbor section Dr. Girty reports 
both the upper and lower series of the Gschel-stufe or upper Carbon- 
iferous faunas to be represented. ‘This section, which is located on 
the north side of Saginaw Bay, Kuiu Island, follows: 
Feet 
b Light-gray limestone, locally cherty; fossils abundant . . . . . 450+ 
a. Black carbonaceous shales, with interbedded, dark, calcareous sand- 
stones, arranged in belts, in which shales and sandstones alternately 
PLECOMINAC eng Meme Ch cel. Ole Uta te ee 
At one point the shales and sandstones of division a are seen to 
pass along the bedding directly into cherts similar to those of Pybus 
