Ravmonu : Fauna of riii. Allegheny Series. 147 



formation it has no such characteristic species as the Brush Creek and 

 X'anport ha\-c. In ahnost evcr\- locaHty at which fossils have been col- 

 lected troiii this layer nautilnids have been found to Ije nimierous, but 

 not well preserved. The fauna is more like that of the Ikiish Creek than 

 that of the Ames, but lacks the abimdance of Worlhenia tahulata and 

 AsUirtcUa vera of the one and Chonetes grannlifer and Tainoceras occidentale 

 of the other. 



Woods Run Limestone. 



In a note in Science (n. s., Vol. XXIX, 1909, 940) the writer an- 

 nounced the presence in the section at Pittsburgh of a previously unnoticed 

 marine limestone between the Pine Creek and the Ames. To this lime- 

 stone the name Woods Run may be applied, as it is best exposed on Woods 

 Run within the city of Allegheny. Since the note mentioned was pub- 

 li hed ihe writer has found this layer at Sharpsburg on the Allegheny 

 River, near Boston on the Youghiogheny, and at McKees Rocks. A few 

 fossils are rather common in this layer but the number of species is small. 

 Lophophyllum projundiim is the commonest and often the only species 



found. 



Amphibia and Reptilia. 



In the red clay which always underlies the Ames in western Pennsyl- 

 vania the writer found the following speci s in 1907. The locality is 

 beside the highway one mile west of Pitcairn, Pa. 



Desmatodon hoUandi Case, Naosaurus ? raymondi Case, 



Eryops sp.. Undetermined reptilian bones. 



Nearly all the specimens were found imbedded about 30 feet below the 



Ames lim stone. The bones are all small and belonged to many different 



individuals. They were evidently washed into the position ;hey occupied 



when found. The layer from which they were taken is near the base of 



the red clay at a place where this clay is unusually thick, that is, they were 



in one of the basins in the eroded land surface on which this clay was 



deposi;ed. 



Ames Limestone. 



About 125 feet above he Pine Creek and 300 feet above the base of 



the Conemaugh is the Ames, on„^ of the most persistent and most fossil- 



ife ous of the marine limestones. Fossils are everywhere abundant in this 



stratum, but it i^ only under favorable conditions that any variety of 



species can be obtained. In almost all the localities where this limestone 



is seen it is a mass of specimens of Choneles granuUfer, Amboccelia plano- 



convexa and Derhya crassa, while other fossils are not apt to be seen unless 



the rock is considerably disintegrated. 



