32 



as a building stone, for structures built of it will invariably 

 show the characteristic but undesirable iron stain. This can 

 be seen in various buildings in the vicinity of the creek on 

 the lake shore road. The rock of this section was formerly 

 quarried and used for constructive pin-poses, in part at least, 

 on the railroad bridges at North Evans. That the rock had 

 a tendency towards the formation of concretionary masses 

 is indicated by the occurrence of one of these on the under 

 side of the bed, about halfway down the section. This mass 

 is cylindrical, three inches in diameter, and lies just below 

 the limestone bed. It is of similar composition, and lies 

 approximately parallel to a joint plain. 



Among the more important fossils of the rock Spirifer 

 sciilptih's (Hall) should be mentioned, a form readily recog- 

 nized b}' its few angular plications and the zigzag concentric 

 lamellae. This species is entirely restricted in this region to 

 the Encrinal limestone, and may be regarded as the typical 

 fossil of the fauna, which is named after It, the ^jirlfer 

 sculptilis fauna." 



The fauna contains a number of gasteropods not found 

 outside of it, as well as a number of others, { Platyostotna 

 (Dinphorostoma) Hneata (Conrad), various species of 

 Platyceras, etc., ) which occur both above and below. Tril- 

 obites are common and of large size, the predominating 

 form being Phacops rana (Green). The pelec^'pods are few 

 and poorly preserved, but the brachipods are well repre- 

 sented. Orthis (Rhipiclomella) is very common, and so are 

 the Stropheodontas. One of the important fossils almost 

 entirely restricted to the bed is Tropidoleptus carinatvs { Con- 

 rad), of which large specimens maybe obtained. The little 

 Vitulina pustulosa (Hall) and the equally neat Centronella 

 impressa (Hall) occur side by side in the upper part of the 

 rock, and have not been noticed outside of it. Another 

 characteristic Terebratulold Is the Cryptonella plaiiirostra 

 ( Hall ), which however is not wholly confined to this rock. 



*For a list of the fossils of this fauna see my paper on the " Fauna of the Hamil- 

 ton Group," etc. 



