Report of the State Geologist. 175 



no allowance for the gradation from one to the other or the 

 intercalation of any other strata. I have already said that even 

 before the final reports of the State geologists were made, and 

 before the map was completed, each one had discovered within 

 the limits of his own district evidences that the geological 

 structure of the State and the relations of the successive forma- 

 tions had not been fully determined; and even at that time a hope 

 was expressed that the State might recognize the necessity of 

 going on with its work to the completion of a geological map 

 which might be worthy of acceptance by the scientific public and 

 by the people of the State as a guide in the study of its geologi- 

 cal formations. 



At a later period, 1844, Prof. Emmons published an agricultural 

 and geological map of the State to accompany his agricultural 

 reports. This map was published upon the same base as the 

 original geological map of the State. The coloration was almost 

 precisely the same on all parts of the map west of the Hudson 

 river. From the northern limit of the State and the adjacent 

 part of Vermont, extending along the east side of the Hudson 

 river and crossing to the west side below^ Rhinebeck, a belt of 

 color was introduced to sho^v the supposed limits of the "Taconic 

 system " of rocks, although no mention of the name is made or 

 any indication in the color legend of the map. The map, how- 

 ever, is fully described on page .361 of volume I of the "Agri- 

 culture of New York." A description and discussion of the 

 rocks of the Taconic system and of its individual members occu- 

 pies chapter five, pages 45-112 of the volume. Since 1844 this 

 map has been the only geological map of the State of New 

 York accessible to the student and to the public. 



This " agricultural and geological " map of Dr. Emmons, fol- 

 lowing so soon after the publication of the State map accom- 

 panying the reports of the four geological districts, doubtless 

 prevented any immediate effort to secure the means of pre- 

 paring and publishing a more accurate geological map of the 

 State. 



Since this map has been extensively distributed without an}^ 

 accompanying explanation, it may be well to reproduce in this 

 place the original description of Dr. Emmons from the volume 

 cited above. 



