132 AN ATTEMPT TO DESCRIBE THE ANIMALS THAT MADE 



to Middletown in Connecticut. These localities occur at the Horse 

 Race in Gill ; near the ferry at Turner's Falls, on the Gill shore ; 

 below the falls, on the same shore ; at the dam on the Montague 

 shore, at the same falls; a mile and a half south of this spot, 

 in Montague, on the road from Greenfield to Athol, on the east 

 side of the canal ; between the bridges over Connecticut and 

 Deerfield rivers ; at a quarry in the southeast part of Montague ; 

 near Pliny Moody's house in th8 north part of South Hadley; a 

 mile west from this spot ; on the west face of Mount Holyoke, 

 beneath the trap, at Titan's Piazza ; on the west bank of Connecti- 

 cut river, at the east foot of Moimt Tom, in Northampton ; at South 

 Hadley canal ; at Cabotville ; one mile south of Cabotville, on the 

 road to Springfield ; at Chicopee Falls ; at a cjuarry on the west bank 

 of Connecticut river, in Suffield, near the Enfield bridge ; at Rocky 

 Hill in Hartford ; at the cove in Wethersfield ; and at a spot one or 

 two miles further south ; at the Chatham quarries ; and two or three 

 miles west of Middletown. At so many localities, so widely scat- 

 tered through the valley, we might expect to find the tracks of all 

 the important species of animals that frequent the shores of an 

 estuary. 



This will be still more obvious, secondly, when we consider 

 the position of the rocks at many of these localities. Ridges of 

 trap-rock run nearly north and south through the whole extent of 

 the sandstone, and by their protrusion they have lifted up the 

 strata on the east side, while they overlie the sandstone on the 

 west side. Now, in every instance but one, it is on the east or 

 upper side of the trap that the tracks occur ; and since the sand- 

 stone strata there are often tilted up from 20° to 50°, we have an 

 opportunity of examining the edges of successive deposits made 

 during a great length of time. Often the successive layers lie 



