56 TWENTIETH ANNUAL REPORT OF THE REGENTS 



One slab of eighteen inches by one foot, fractured face, intended tor 



polishing. 

 One column about four feet high, with base and shaft polished. A 



very fine illustration of the adaptation of this marble to ornamental 



use. 



Potsdam Sandstone. 



One block of about one foot by eight and ten inches, with cleavage or 



fractured faces. 

 One small specimen of about four by six and eight inches : cleavage 



and fractured faces. 



Calciferous Sandstone. 



A block of about one foot by ten and eight inches : cleavage and 

 fractured faces. 



Quebec Group. 



Two slabs of Roofing slate, about five feet by ten feet: from Grran- 

 ville, Washington county. 



Chazy Limestone. 



One large slab, sawed for polishing, about twenty inches by two and 

 a half feet. 



Birdseye Limestone. 



A block fourteen by eight and ten inches : cleavage and fracture faces. 



Hudson-river Group. 



1. A block " Blue stone," with dressed and fractured faces ; eighteen by 



six and eight inches. The same as used in St. Peter's Church. 

 From near Schenectady. 



2. A dressed and clean-fractured block of nearly two feet long by six 



and eight inches: " Blue stone." From near Schenectady. 



3. A cube of nine inches, finely dressed on four faces ; with the upper side 



a fractured surface. Locality ? 



4. A gray sandstone, one foot long by five and six inches ; dressed on 



three faces : one face and ends fractured. From near Newburgh. 



Medina Sandstone. 



1. A block two feet long by eight inches wide and thick : dressed and 



cleavage^faces. From near Lockport. 



2. A block one foot long by ten inches wide and thick ; dressed surface 



and one fractured face : red. From Medina. 



3. A block of about one cubic foot ; dressed and fractured faces : varie- 



gated. From Medina. 



4. A block of about one cubic foot ; dressed and fractured faces : grey. 



From Medina. 



Clinton Group. 



1. Brown sandstone : A block eight inches square and five inches thick ; 



dressed faces, with rosette cut on one side. Frankfort, Herkimer Co. 



2. A block of the same stone, thirteen by seven inches, and four inches 



thick ; dressed faces. Frankfort, Herkimer Co. 



