in the Wappinger Valley Limestone. 131 



associated with it. The fossils are present in considerable 

 numbers, but so much scattered through the rock that large 

 masses must be broken up to obtain a few organisms. 



I have also found a few specimens of Lingulepis in the 

 extension of the western fork of this hill in the second and 

 third fields beyond, where it becomes a blue calcareous shale (E). 



No fossils have yet appeared south of Mr. Smiley's property, 

 that is, south of the fourth field from the Driving Park, except 

 some Stromatoporoid forms which are not infrequent through- 

 out the Potsdam strata. From these localities I have already 

 collected over 500 fossils ; some of these are in a perfect state 

 of preservation, while many are in a very imperfect and frag- 

 mentary condition. There is no doubt whatever as to the 

 presence among them of several well-known and well-marked 

 Potsdam fossils, while the whole group appears to belong to 

 that geological horizon. Since, in my explorations among 

 these limestones during seven years, all of the abundant fossils 

 found have indicated the presence of either the Calciferousor of 

 the Trenton formations alone, I have not failed to consider the 

 question carefully whether the present fossils, though of a 

 Potsdam type, may not after all exist here in Calciferous 

 strata. But I have found no facts to favor the latter supposi- 

 tion. The rock is lithologically considerably different from 

 any known fossil-bearing Calciferous in Dutchess County. 

 The fossils are all of the type so well known in the Potsdam 

 rocks of New York State and of Wisconsin, while no single 

 Trenton or Calciferous fossil of the vicinity or of any locality, 

 has appeared among the hundreds here collected. 



These fossils will require a very careful study for a full deter- 

 mination as to the number of genera and species. The follow- 

 ing preliminary statement will indicate their nature in general. 



1. Lingulepis pinniformis; several specimens of both valves, 



some of which are quite perfect. 



2. LAngulepis minima; many specimens of both valves. 



3. Lingulepis acuminata, probably ; several good specimens. 



4. Obolella (Livgulella) prima; several specimens. 



5. Obolella; a minute species resembling a Nana f one or two 



specimens. 



6. Platyceras; undescribed species ; one or two. 



7. Remains of small encrinal columns ; several. 



8. jPtychoparia ( (Jonoeephalites) ; n. sp. resembling Lowensis, but 



possessing an occipital spine; several glabellas and pygidia. 



9. JJicellocephalus ; two or more species; undetermined; numer- 



ous specimens. 



10. Ptychaspisj one or more undetermined species; several speci- 



mens. 



11. Stromatocerium? undetermined ; abundant. 



