NO. 2 SMITHSONIAN EXPLORATIONS, I924 25 



Groton, specimens and notes on peculiar diorite-pegmatites, older 

 than the Westerly granite sills, were obtained and other pegmatites of 

 interest were observed intruding the Mamacoke gneiss which is 

 quarried in the Goos, Flatrock and other quarries in Waterford. One 

 day was spent in examining the various outcrops, cuts, and quarries 

 along the shore line branch of the New York, New Haven and Hart- 

 ford Railroad from Saybrook Junction to Nantic. Another was spent 

 at the Falls of the Yantic, in Norwich, a famous locality for minerals 

 obtained early in the last century and but little known since. No iolite 

 nor corundum were found, but sillimanite was located in quantity in 



PiC'- 33- — The main pit of the mine at Long Hill in Trumbull, Connecticut, 

 probably the first tungsten mine of America. While never commercially suc- 

 cessful as a tungsten mine and the source of more than one " wildcat " 

 project, this is now a famous mineralogical locality. 



a schist in a railroad cut, and plenty of monazite specimens were 

 obtained from pegmatite blocks in fence walls in the neighborhood. 



The latter part of the trip was spent at Branford as the guest of 

 Mr. Alfred E. Hammer, who is particularly well informed regarding 

 the local geology and mineralogy and the history of mining in his 

 vicinity. In company with Messrs. Hammer and Warren E. Mum ford, 

 metallurgist for the Malleable Iron Fittings Company of Branford, 

 many of the important localities were visited. These included the 

 iolite and garnet-vesuvianite ledges in Guilford, the jail spar quarry, 

 the spessartite ledge and other feldspar quarries in Haddam, and the 

 Gillette quarry on Haddam Neck, where many remarkable minerals 



