GEOLOGY: TURNER'S FALLS REGION. 



TWO EXCURSIONS IN THE CONNBCTICCT VALLET. 



Prof. B. K. Emerson. 



Start m the morning from the Mansion house in Greenfield, and 

 drive five miles across the sand-plain to Leyden Green, where is a 

 very fine and instructive contact of Triassic sandstone upon the 

 Leyden argillites showing the far-travelled character of the arkose. 

 Drive thence four miles across the strike of the sandstone to the 

 exposure of the basal contact of the trap sheet on the sandstone, 

 showing the frothing up of the sand into the trap, and many curi- 

 ous contact phenomena. Among these is to be noticed especially 

 the formation of diabase pitchstone, as described by the writer. 

 Climb to the lookout over the valley, then drive east to the upper 

 contact of the sandstone on the trap, which is coarsely amygdaloi- 

 dal and full of minerals. 



A visit to Turner's Falls, the fault at the mouth of Fall river, 

 and the chlorophaeite locality, is full of interest. Drive two miles 

 east to the "bird-track" quarries at the Lily pond, where is an 

 abandoned waterfall of the Connecticut with its canon in which lies 

 Lily pond. Return to Greenfield by electrics from Turner's Falls. 

 (See also Palieontology, p. 43.) 



2. 

 Go from Northampton in the morning by train (five minutes) to 

 Mount Tom station. Cross in the ferry and see Titan's piazza, over- 

 banging trap columns with sandstone contact ; and Titan's pier, 

 with the contact of underrolled trap full of limestone inclusions and 

 amygdaloidal at the base. Recross and stop the train at the 

 3 (33) 



