148 Annals of the Carnegie Museum. 



Fossils have been collected from the Ames at Summerhlll, Blairsville 

 Intersection, Beatty, Pitcairn, and at a number of localities within the 

 limits of the city of Pittsburgh. 



The characteristics of the Ames are the abundance of Chonetes granulifer, 

 Amboccelia planoconvexa, and Derbya crassa, and the presence of Piignax 

 Utah, Rhipidomella pecosi, and Tainoceras occidentale. Pugnax utah and 

 Rhipidomella pecosi seem to be restricted to this horizon, and Tainoceras 

 occidentale makes its first appearance here. Fish teeth are fairly common, 

 Petalodiis oin'ooisis being the most abundant species. Brachiopods are 

 ver}' numerous in the Ames, just as the mollusca predominate in the 

 Pine Creek and Brush Creek. Brachiopods are also very abundant 

 in the Vanport, but the two limestones have only a few species in 

 common. 



There are very few published lists of the fossils of the Ames limestone. 

 A classical one is that identified by Meek from fossils collected by Steven- 

 son at Morgantown, West Virginia. This list^ shows that the fauna at 

 Morgantown is similar to that in Pennsj'lvania. In the Report on Ohio, 

 Brooke, and Hancock Counties of West Virginia is a list of the fossils 

 collected^ by Professor Grimsley from the Ames in those counties. The 

 specimens were identified by Dr. Beede, and the species are those which 

 are common in the Ames in Pennsylvania. In commenting on this fauna 

 Dr. Beede discussed the probable position of the Ames in relation to the 

 section in Kansas. While noting that most of the species listed are those 

 which have a long range in the Pennsylvanian of that State, he is inclined 

 to place the Ames at about the horizon of the Oread limestones, or as he 

 says: "From the evidence at hand I should refer the Ames limestone 

 roughly to the Shawnee division of the Kansas Pennsylvanian, as that 

 division is limited by Haworth, or the basal part of the Shawnee." 



Mr. D. Dale Condit has recently published a short list of the fossils 

 of the Ames limestone at Carpenter, Meigs County, Ohio. This list 

 shows that the fauna of the Ames in southern Ohio is very similar to that 

 found in western Pennsylvania. Mr. Condit notes that Chonetes granu- 

 lifer is so abundant as to form almost solid masses in the Ames, but is not 

 found in the Cambridge, while Chonetes verneuilanus is extremely abundant 

 in the Cambridge and is not found in the Ames. In Pennsylvania C. 

 verneuilanus has not yet been found in the Ames, while it does occur in the 



'Third Annual Report Board of Regents of West Virginia University, 1870, 

 67. Reprinted in West Virginia Geological Survey, Vol. II, 1903, 257, and in the 

 County Reports of the same Survey, 1907, 127. 



