No. 50.] 
257 
A sulphur spring is said to occur near the Katerskill, two miles west 
of Catskill village, on Henry Palmer's farm, and wiili gas bubbling up 
through the water. Another sulphur spring, a mile from the above, on 
the other side of the creek, on Peter Acler's farm. Another mineral 
spring in the township of Esopus, and not far from the village. I did 
not see the three last mentioned springs. 
The range of limestone described in the second annual report under 
the name of Barnegat limestone, and in the third report under the name 
of Newburgh limestone, occupies a small area in the district under ex- 
amination this year. A hundred acres or more of this rock may be 
seen in the southeast corner of the township of Marlborough, in Ulster 
county. On the north-northeast it crosses the Hudson and ranges through 
Dutchess and Columbia counties, while on the south-southwest it 
ranges across Orange county. In Marlborough it has been used some 
for lime, but to no great extent. These lands will ultimately become 
valuable. The general dip of the limestone, is the same as the adja- 
cent slate rocks, viz : east-southeast from 20° to 70°, 
But few fossils have been found in the Hudson slate group this year. 
A few fossil shells, or rather the impressions, were found in the thick 
beds of graywacke, which contained drusy quartz and small broken 
fragments of anthracite, on the right bank of the Wallkill, by the road 
side, a few rods above the falls at Dashville, in New-Paltz, Ulster 
county. The other fossil remains were fucoides, among which are F. 
serra, F. dentatus, and two other species which are probably F. lineatus, 
and F. ramulosus. These fucoides or graptolites were in the black shale 
underlaying the Shawangunk grit, on the mountain about 1^ miles east 
of Ellenville, at the height of 500 to 700 feet above the valley. 
The Hudson slate group corresponds in many respects with the 
Cambrian system" of Professor Sedgwick, to which it may be a geolo» 
gical equivalent. It occupies most of the country between the High- 
lands on the southeast, and the Shawangunk mountains on the north- 
west, and forms the mass of the latter mountains which are capped, 
and in some places enveloped by the Shawangunk grit. From Kings- 
ton, the Hudson slate group ranges along the right or western bank of 
the Hudson to Albany, underlaying the superincumbent rocks uncon- 
formably, with few exceptions. Its range on the left bank of the Hud- 
son, as far as examined, is detailed in the second annual report on the 
geological survey of the first district of New- York. 
[Assembly, No, 50.] 83 
