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NEW YORK STATE MUSEUM 



determinations as refined as our knowwledge justifies. Ex- 

 perience has taught us that the representation upon maps 

 of this scale, of the grouping of the rocks as recognized in 

 the older classifications leaves very much to be desired. The 

 value of such maps is chiefly their usefulness to the student of 

 local conditions. They are therefore made to represent such local 

 conditions even though these may not appear in adjoining regions. 

 The refined coloration has naturally involved the closest work 

 in stratigraphic determinations and it has also introduced an in- 

 evitable incongruity in coloration. So far as the color scheme is 

 concerned and the number of shades and patterns which the plan 

 of the work makes it necessary to introduce, it may be said that 

 each map is complete in itself, and probably no color scheme 

 could be devised which would be sufficiently elastic to lend itself 

 to the production of a series of maps on this scale with the refine- 

 ment of stratigraphic determination that we are practising. 



Buffalo quadrangle. The preparation of this map has been 

 brought to completion by D. D. Luther. The work was begun 

 some years ago by Prof. I. P. Bishop and it seemed well to go 

 over the ground again in the hope of making the stratigraphic 

 determinations somewhat more detailed. This Mr Luther has 

 done and has been aided therein by Professor Bishop. This 

 map will be submitted for publication during the coming year. 



Penn Yan and Hammondsport quadrangles. These two quad- 

 rangles lie one to the north of the other and have been entirely 

 mapped this year by D. D. Luther. This work has been in con- 

 tinuation of the Canadaigua-Naples map issued last year and 

 the Watkins-Elmira map which is now in press, the former at the 

 west and the latter at the east of this region. These quadrangles 

 have been taken up in north and south pairs with the idea of covering 

 a pretty full sweep of the Devonic rock series. The meridional dis- 

 tance represented by one of these double sheets is 35 miles. The 

 Penn Yan-Hammondsport map will be issued soon, accompanied 

 by an explanation of the stratigraphic determinations there made. 



Rochester quadrangle. The preparation of this map was be- 

 gun by C. A. Hartnagel and carried well toward completion. Mr 

 Hartnagel has had the benefit of such local cooperation as was 

 available and acknowledges his obligation in this regard to Prof. 

 H. L. Fairchild and Prof. A. L. Arey. 



Tully quadrangle. This area lies directly south of Syracuse 

 and is the chief collecting ground for the students of geology 

 and paleontology in that center. The map has been prepared 



