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Junction of Trap and Sandstone. 



Other instances of the junction of sandstone and trap, with similar 

 effects attending them, may be seen in the south-east part of Wal- 

 lingford, near the Northford line, in the form of veins, dykes, over- 

 lying masses and beds injected between the strata. 



The most interesting of all the places in Wallingford, on account 

 of its geological structure, is to be seen on and near the road leading 

 from this place to Cheshire, in that portion of country occupied by 

 dyke No. 4, fig. 1. The trap here makes its appearance in two 

 places near the bank of the Quinipiac river, between the turnpike 

 and river, in steep though not high mural fronts, facing the water, 

 branching out and crossing the turnpike in five distinct veins or dykes, 

 as may be seen in figure 3. 



Fig. 3. 



p- y ^ y ^ 



1, 1. Road from New Haven to Hartford. 2. To the mills. 3,3. Road to Chesh- 

 ire. 4. Road to Wallingford. 5. Quinnipiac. 



This place may be readily found by any person travelling on the 

 turnpike running from New Haven to Hartford, it being about two 

 thirds of a mile north of Cook's hotel, formerly the Bishop place, 

 and on the first hill north of the same. Its first appearance on the 



