116 



Report of the State Geologist. 



36. MyUlarca (PUthomyt ilus) ovvformis (Con.) Hall, (r) 



37. Liopteria Bigsbyi, Hall (?). (r) 



38. Pliacops rana (Green), Hall. (r) 



39. Pleurotomaria capillaria, Con. (r) 



40. JBellerophon, sp. (rr) 



41. Ortlioceras, sp. (fragments of two species). (r) 



42. Coleolus, sp. (rr) 



43. Crinoid stems, large. (c) 



XVIII G l . The hill on the south side of Pleasant brook between 

 Smyrna and Upperville, is steep and mostly wooded. Not far below Upper- 

 ville, a small run enters Pleasant brook from the south and the rocks are 

 quite well exposed along its course. At the mouth of the run are shales 

 similar to those of XVIII C 2 , containing similar fossils. These shales extend 

 up the hillside for some distance and are about 147 feet above the level of 

 the brook which, at the mouth of the run, is approximately 1,222 feet A. T., 

 and contain numerous fossils, Tropidoleptus carinatus (Con.), Hall, being 

 especially abundant. A hasty search afforded the following species : 



1. 



Tropidoleptus cariuatus (Con.), Hall. 



(a) 



2. 



Spirifer mucronatus (Con.), Bill. 



(rr) 



3. 



Spirifer granulosus (Con.), Hall and Clarke, 







or 8. audaculus (Con.), Hall and Clarke. 



(rr) 





Specimen too imperfect for specific identification. 



4. 



IAorhynchus multicostus, Hall. 







The lateral plications are very faint. 





5. 



Orthis Vanuxe?ni, Hall. 



(rr) 



6. 



Palceoneilo emarginata (Con.), Hall. 



(rr) 



7. 



Nucula lirata (Con.), Hall. (?) 



(rr) 





A broken specimen. 





8. 



(?) Sch izodus, sp., badly broken specimen. 



(rr) 



9. 



Crania, sp., very poorly preserved. 



(rr) 



10. 



l y h<ic<>i>x rana (Green), Hall. 



(rr) 



XVIII G % . On top of these Hamilton shales, 147 feet above the level 

 of Pleasant brook, is an arenaceous limestone forming the top of the second 

 cascade in the run. The stratum is composed of three layers as it crosses the 

 stream, the lowest, ten inches in thickness, containing quite a large percentage 

 of sand, the upper layer being the purest limestone. A little higher are 

 rather coarse, arenaceous blue shales, and then the rocks are covered for about 

 ten feet. At (his point is the third cascade in the stream, at the base of which 



