viii 



Report of the State Geologist. 



the counties of Clinton and Franklin, and to some extent within the limits of 

 St. Lawrence county. The work of the present season which will be continued 

 by Mr. Gushing will complete the knowledge of the geology of that portion 

 of country preparatory to its final adoption upon the geologic map. 



Those portions of the published map which were left blank in Oneida, 

 Jefferson and Oswego counties have been carefully examined by Mr. C. J. 

 Sarle, who has travelled on foot over the boundary line of the crystalline rocks 

 to the Calciferous sandstone and the succeeding limestones, including the 

 Trenton. He has also examined in the same manner the belt of country along 

 the upper limits of the Trenton limestone and the contact of that formation 

 with the Hudson river shales. 



Mr. A. W. Grabau, of the Massachusetts Institute of Technology, has 

 contributed a paper upon the fauna of the Hamilton group at Eighteen-mile 

 creek on Lake Erie, and since this paper contains some interesting data in 

 regard to the geology and paleontology of that part of the state, it has been 

 adopted in this report, as a contribution to our knowledge. 



Prof. J. M. Clarke, assistant state geologist, has contributed an important 

 paper upon the fauna of the Goniatites intumescens zone of the Portage group. 

 This paper is the result of much work in the collection of material in the 

 field, and of office study, and will be an interesting contribution to our knowl- 

 edge of this fauna and its geologic relations. 



A description of the fossil corals, which have been under investigation 

 for many years, and for the illustration of which a large number of drawings 

 nave already been made, will constitute a portion of a following report. 



The Memoir upon the Dictyospongidse, commenced in the report of last 

 year, will be continued in this report ; completing the work with about seventy 

 plates and more than two hundred pages of text. 



Very respectfully, your obedient servant, 



JAMES HALL, 



State Geologist and Palaeontologist* 



