NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS 289 



Feet Meters 



Fauna. — The fossils collected occur from 30 to 40 feet 



(9.1 to 12.2 m.) above the base, where there are some 

 compact regular layers. (69b). 

 id. Gray limestone somewhat similar to 2b in appearance 

 and bedding but harder, more regular and on weath- 

 ering breaking down into blocks, thin layers and 

 angular fragments. On the weathered sections of the 

 thicker layers the laminated character of the original 

 deposit is finely shown by the unequal erosion of the 

 calcareous and magnesian lamellae. The magnesian 

 lamellae are from g to i inch (.3 to .6 cm.) in thick- 

 ness and stand out in relief from the softer gray 

 limestone and weather to a buff and brown color, 

 which adds to their striking appearance. The thick 

 layers split up with irregular surfaces on the lines of 



the lamellae 24 7.^ 



Fauna. — (2ix) : 



PhyUoyraptus ilicifolius major Ruedemann 

 (MSS) 



Didymograptus paciftcus Ruedemann (MSS) 



Lingula sp. 



Ophilcta sp. 



Eopteria sp. 



Eccylioptenis sp. 



Mcgalaspis. sp. 



Goniurus sp. 

 Dr. Rudolph Ruedemann, in commenting on this 

 faunule, said, " These two graptolites suggest that 

 the formation is comparable to graptolite horizons 

 2 or 3 of the Deep Kill shale and is therefore of 

 Beekmantown (Canadian) age." (January 19, 1923). 

 ic. Thick-bedded, gray limestones that have more or less 

 of the character of both 2c and 2d. The lamination 

 is more irregular than that of 2d, and the magnesian 

 lamellae proportionally thicker. At 126 feet (38.4 m.) 

 from the top a few of the gray limestone lamellae 

 increase in thickness to 4 inches (10.2 cm.) or more, 

 and numerous fragments of trilobites occur in them. 145 44.2 



Fauna. — (69c) : 



Mcgalaspis fauna 



Total of 1 400 121.9 



2. Steel to dirty gray, finely arenaceous magnesian lime- 

 stone, with included thin layers, nodules, and stringers 

 of gray, dark rusty brown-weathering chert 95 28.9 



Fauna. — Large annelid trails on surface of layers, and 

 borings within the layers. 



2,a. Light gray, compact limestone, with considerable cherty 

 matter in thin, irregular and often inosculating lamel- 



