33c) SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



At 510 feet (155.5 m.) numerous sections of a flat p-^g^ Meters 



coiled gastropod occur. (65s) : 

 Girvanella sp. 

 Maclurites ? sp. 

 Orthoceras sp. 

 At 540-550 feet (165.3-167.6 m.), Receptaculites ? 

 and sections of gastropods (65t) : 



Receptaculites ? sp.^ 

 Maclurites sp. undt. 

 Eccyliomphalus ? sp. undt. 

 At 680-720 feet (207.2-219.4 m.), small Stromato- 

 pora, slender tubes, and sections of gastropods seen 

 on surface of thick layers. 



At the horizons where fossils occur the layers 

 carrying them are darker and more granular ; this is 

 at 336, 510, and 680 feet (102.4, 155.5, and 207.2 m.) 

 from top of limestone ib 730 222.5 



Total of 1 762 232.3 



The base of it usually occurs at a terrace formed 

 by the breaking down of the subjacent thinner layers 

 and shaly partings. Where a sharp ridge occurs, the 

 massive limestones form a great clifif, the beds below 

 making a gentle slope or saddle to the next massive and 

 more compact band of layers.^ 



LOWER DIVISION 



2a. Gray and bluish-gray, thin-bedded limestone, with many 



fossils 60 18.3 



Fauna. — (65U) : 



Callograptus sp. 

 Receptaculites ? sp. 

 Calathium ? 

 Orthoid 



Maclurites ? sp. 

 Lecanospira ? sp. ? 

 26. Thin-bedded, gray, hard siliceous limestone, with inter- 

 bedded bands of shale and shaly limestone 310 94.5 



2c. Bluish-gray, shaly, and thin-bedded limestones 40 12.2 



Famm. — (65W) : M e galas pis— Bellfontia zone. Numerous 

 annelid trails on surface and fragments of trilobites. 



Total of 2 410 125.0 



Total of Sarbach formation^ 1,172 357-3 



^ These are not true Receptaculites but appear to belong to the Receptaculidae. 



^ The section from the base of ib was taken across to north side of Clear- 

 water Canyon, as the latter is eroded almost at right angles to the strike. Its 

 continuity is assured by the topography, lithology, succession of strata, and the 

 presence of similar fossils. 



^ The fossils found in the Sarbach were tentatively identified by Dr. E. O. 

 Ulrich. 



