ELIZABETHTOWN AND PORT HENRY QUADRANGLES lO'I 



dipped 35° west. The vein extended half a mile along the lake 

 but the ore was pyritous, tough and difficult to crush for the forge. 

 An analysis from Dr L. C. Beck's report on the Mineralogy of 

 New York, pages 15 and 37, is as follows: 



FeO 24.50 



Fe.Oa 66.80 



Si02.AL0a, etc . • 8.70 



100.00 

 Iron 65 . 23 



This old deposit is no longer worked and has almost been for- 

 gotten. It occurs where the gabbros are a marked feature in the 

 ^Delaware & Hudson Railroad cuts and it may be titaniferous. 

 Since both Dr Beck and Professor Emmons speak of its difficulty 

 of treatment the titanium may be the reason. Little was known 

 of titanium in their time. 



From Crag harbor for 3 miles northward the geological section 

 along the lake shore is of more than ordinary interest. Partly 

 from the original precipitous topography and partly from the cuts 

 of the Delaware & Hudson Railroad, the exposures are excellent. 

 The embayment of Crag harbor (called Craig on the U. S. Geol. 

 Sur. maps) is due to block faulting, so that the northwest side is 

 a precipitous wall. Above are the limestones and associated' horn- 

 blendic schists and schistose gneisses of the Grenville. Below and 

 with a sharp contact against the limestone is a massive hornblendic 

 and f eldspathic gneissoid rock in which are located the railway cuts. 

 Immediately beneath the limestone is a band about 75 feet thick 

 of a more feldspathic variety. Under the microscope it contains 

 quartz and acidic plagioclase as the most abundant components. 

 There is also a goodly proportion of orthoclase^ often microper- 

 thitic and there are scattered shreds of brown hornblende. Below 

 the last named and appearing in the railway cut is a more basic 

 phase which consists, as the microscope shows, of plagioclase in 

 broad crystals, orthoclase often microperthitic, a little quartz, 

 rather abundant hypersthene and brown hornblende. It is a rock 

 which could not have been derived from the basic gabbro. Its 

 affinities seem to be quite close with the syenites. The dark green 

 feldspar together with the abundant hornblende and hypersthene 

 give the rock a basic look, beyond what the mineralogy of the 

 slide would seem to warrant. 



About 60 paces (or 6 rails) north along the track fine grained 

 gabbro is found in the cliff, - and at short intervals still farther 



