Review of the New York Geological Reports. 51 
ness in the state. Many of its organic remains are in a wonder- 
ful state of preservation, so that under the lens, the most minute 
structure of the smallest corals can be discerned. 
The best sections are exposed on Catskill Creek, in Greene 
County, along the railroad. This locality gave origin to the name 
by which this formation is usually designated. It is also well 
exposed near the village of Schoharie, at Sharon Springs ; near 
the Great Falls of Esopus, and at Rochester in Ulster County. 
Outliers of all the three divisions, besides other members of the 
Helderberg series, exist on the east side of North River, on Be- 
craft Mountain and Mount Bob near Hudson, lying unconform- 
ably on the subjacent slaty rocks. 
A few of the most common fossils are embraced in the follow- 
ing wood cuts. 
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