No. 50.] 
225 
Bog ore was also observed on the flats of the Delaware, on land of 
Mr. Bela Frost, 2^ miles from Delhi, on the road to Bloomville. 
Dr. Henry Marshall, of Kortright, to whom I am indebted for much 
local information and many kindnesses, informed me of a locality of 
bog iron ore on the land of Mr. Rich, near Roseville, opposite the mouth 
of Betty's brook, Delaware county. The ore is said to be abundant. 
Bog ore is said to have been ploughed up on the flats of the Wall- 
kill, near Paltz, Ulster county. The locality has not been explored, 
and the quantity is not known. 
A lluvions fro7n Springs. 
Calcareous tufa has been observed in several localities during the 
past season. The most important one is at Sharon Springs, in Sharon, 
Schoharie county. Several springs, (most of which are strong hepatic 
or sulphuretted waters,) rise from the ground, and are more or less 
loaded with carbonates and sulphates of lime, magnesia and iron. The 
carbonate of lime is the principal deposite, and a mass of tufa, averag 
ing two hundred yards in length, fifty in breadth, and about ten in 
depth, (or probably 100,000 cubic yards of rock,) has, in the course of 
time, been precipitated from solution in these waters. 
The springs rise from the pyritous slates lying under the Schoharie 
or Helderberg Kmestone series, and which we shall have occasion to 
discuss in another place.* 
Helices, leaves of trees, and various plants, are constantly being im- 
bedded in this rock, and the most beautiful specimens of incrusted 
moss, and the tufa, under various imitative forms, containing shells and 
vegetable impressions, can be procured. 
Another locality of calcareous tufa is about 1^ miles west of Scho- 
harie, on the road to Cobleskill. It is loose, and can be shovelled up. 
It may be called a tufaceous marl, and is adapted for agricultural uses. 
* These slates, in the northern part of Schoharie county, almost deserve the name 
of barytic slates, for sulphate of baryta is found in some abundance in them, and has 
been observed in them in several places, by Mr. John Gebhard, jr. This gentleman 
was engaged as an assistant on the survey of Schoharie county, and it is in a great de- 
gree owing to his indefatigable researches, and minute local knowledge, that I am en. 
abled to speak of many things in that county that would have remained unobserved^ 
[Assembly, No. 50=] 29 
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