150 Annals of the Carnegie Museum. 



Marine Shale at the Horizon of the Morgantown. 

 In Riverview Park, Allegheny, there is a thin-bedded black shale above 

 the Elk Lick coal and 25 feet above the top of the Birmingham. This 

 shale occupies the position of the Morgantown sandstone, and at this 

 locality is full of specimens of Aviculopecten cf. ivhitei. This Aviciilopccten 

 has not been found by the writer in direct association with marine fossils, 

 but specimens have been collected from the Birmingham shale, which is 

 now know to be marine, and from the shale which overlies the Brush 

 Creek. 



Summary. 



In the table given at the end of this paper 97 species of invertebrate 

 fossils are listed. Of these 17 are found in both the Allegheny and Cone- 

 maugh series, 28 are found in the Allegheny series only, and 52 are re- 

 stricted to the Conemaugh. If larger collections had been made and a 

 greater area covered it is probable that these figures would have been 

 materially altered, but it must be admitted that they indicate a great 

 change of faunas during the time represented by the unfossiliferous strata 

 between the Vanport and the Brush Creek. Considering the three highly 

 fossiliferous limestones of the Conemaugh, the Brush Creek, the Pine 

 Creek, and the Ames, it will be no iced that of the 6 ■ species found in the 

 three, 36 are found in at least two of them and 19 are common to all. 

 In this connection the list of fossils identified by Meek from the Ufhngton 

 shale near Morgantown, West Virginia, is of interest. The Uffington is 

 at a horizon lower in the Conemaugh than the Brush Creek as it rests 

 directly on the Upper Freeport coal. All the species named in this list 

 are common in the Conemaugh of Pennsylvania and none of the species 

 characteristic of the Vanport are present. 



From the range of the individual species but little can be learned. It 

 is a well-known fact that Chonetes mesolobus is confined to the lower por- 

 tion of the Pennsylvanian in Kansas and elsewhere, and this proves to be 

 true in Pennsylvania. In our collections there are, however, a number of 

 species whose range terminates with that of Chonetesme solohus, but which 

 in Kansas extend much higher in the section than does that species. 

 Thus in Kansas Squamidaria perplexa extends to the Hartford limestone^ 

 Dielasnia bovidens to the Burlingame shale, Naticopsis altonensis to the 

 Howard limestone, and Trachydomia wheeleri to the Lecompton limestone. 

 Piignax Utah, RhipidomeUa pecosi, Amboccelia planoconvexa, Worthenia 

 tabidata, and Phanerotrema grayviUensis seem to have a much wider range 



