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NEW YORK STATE MUSEUM 



the expanded Lake Ontario basin as far as the Finger lakes, after 

 Dr G. K. Gilbert, whose labors in Pleistocene geology are widely 

 known. 



Shore lines of Lake Iroquois . Progress has been made in plotting 

 the beaches of these artcient waters and it is expected by Professor 

 Fairchild that the work will be completed in another season. 



Moraines. Data in regard to the exact location of the belts of 

 morainic drift indicating the successive edges of the retreating ice 

 sheet are being continually increased and their final determination 

 will greatly elucidate the location and outlines of the ancient 

 glacial lakes. 



Schuylerville quadrangle. Professor Woodworth has surveyed 

 a portion of this region to determine the distribution of the gravels, 

 sands, clays and residual slate deposits and their bearings on the 

 history of the changes in water levels of the upper Hudson valley. 



Postglacial faults of eastern New York. While investigating the 

 changes of level which have affected the Pleistocene river and lake 

 deposits of the Hudson and Champlain valleys Professor Wood- 

 worth noted certain dislocations of the bed rock which have taken 

 place in comparatively recent time, since the glaciation of the sur- 

 face. The importance of these fractures as indexes of a movement 

 -of the crust which appears to be associated in time with the tilting 

 of the continent in the postglacial epoch has led to the careful 

 study of their extent and distribution. These phenomena will be 

 described in full in a forthcoming publication. 



Industrial geology 



Mines and quarries. As promptly as possible after the annual 

 taking of inventory by producers a statistical report was issued as 

 bulletin 93, entitled The Mining and Quarry Industry of New York 

 State, prepared by the Assistant State Geologist. The public 

 demand for this report was very large and the edition immediately 

 exhausted. Such reports will be issued annually from this office 

 and as soon after the beginning of the year as is practicable. 



Iron ores . The iron ores of the Adirondacks have been the sub- 

 ject of special study. Field investigation was begun in the northern 

 districts of Clinton county where the geologic conditions surround- 

 ing the ore bodies appear to be less complex than in the districts 

 farther south. 



The ores of this section occur on the outer slopes of the Adirondack 

 uplift near the junction of the Precambric gneisses with the over- 

 lying Paleozoic sediments. The country rock is always gneiss 



