CONTENTS. 



PAGE 



1 Title i 



2 Letter of Transmission iii 



3 Staff of the State Geologist i v 



4 Contents v 



5 Report of the State Geologist vii 



6 Report on the Boundary between the Potsdam and Precambrian rocks north of 



the Adirondack^ ; by H. P. Cushing 1 



7 The Naples Fanna (Fauna with Manticoceras intumescens) in Western New 



York ; by John M. Clarke 29 



8 Notes on the early Stages of Certain Goniatites ; by John M. Clarke 163 



9 The Brine-springs and Salt-wells of the State of New York, and the Geology of 



the Salt District; by D. D. Luther 171 



10 The Faunas of the Hamilton Group of Eighteen-mile Creek and Vicinity, in 



"Western New York ; by Amadeus W. Grabau 227 



11 A Memoir on the Palaeozoic Reticulate Sponges constituting (he Family 



Dictyospongid.e, Part 2 ; by James Hall in collaboration with John M. 

 Clarke 341 



