370 Ford— Primordial Fossihfrom Rensselaer County, N. Y. 



stone occurring there, I had hoped to be able to devote a good 

 deal of time to the further study of this field during the past 

 season, but other matters prevented, and while I have made a 

 number of additional observations upon the structure of the re- 

 gion, I am not, as jet, prepared to place them upon record. 



From the conglomerate-limestone* I have, however, made 

 collections on several different occasions and with very gratify- 

 ing results. The following is a list of the species known to me 

 from this deposit at the present time, all of which have been 

 obtained from the rock in place: (1) Olenelhis asaphoides, {2)Co- 

 iwcephalites triliueatus, (3) Microdiscus speciosus, (4) Flyolithes 

 Americanus, (5) U. impar, (6) HyolitheUus micans,\ (7) Stenotheca 

 rugom, (8) OboleUa desquamata, (9) 0. intida. Of these 2, 4 

 and 9 were known from this deposit at the time of publication 

 of my former paper. All of these species occur likewise in the 

 Lower Potsdam limestones at Troy. This gives nine species 

 in common to the two localities and is, I believe, conclusive as 

 to the age of the conglomerate in question. I have no doubt 

 but that, when further studied, this rock will furnish yet other 

 species of the Troy series. 



Fossils from the Primordial at Troy. — For a long time my ex- 

 aminations of the slates at Troy for fossils were unrewarded, 

 notwithstanding 1 gave a good deal of attention to the subject. 

 But on one occasion last summer I succeeded in finding several 

 slabs containing undoubted plant remains. There appear to be 

 two or three species. Of these, however, but one is represented 

 in the collection by specimens sufficiently well preserved to ad- 

 mit of anything like a satisfactory determination. This is of 

 the genus Palceophycus, and is, according to Mr. Billings, to 



atelv submitted my specimens for compai 

 ?al with his Palceophyois incipiens (Pal. Fos. 

 p. 2)," from rocks of the same age in Verr 



north shore of the Straits of Belle Isle in Labrador. The prir 

 cipal specimen in my collection is six inches long, nearly straigb 

 of uniform width and without any evidences of branching. 

 the same slab there are several shorter fragments. This adds 



