410 E. S. Lull — Life of the Connecticut Trias. 



fish-bearing shales themselves. Geologically, the shale bands 

 are associated with the trap outflows, an anterior bed following 

 immediately npon the anterior trap sheet to a thickness of from 

 50 to 100 feet and a posterior zone of about 100 feet imme- 

 diately preceding the posterior trap, the relationship of the 

 shale and trap being in one case the reverse of the other. 

 Geographically, the fish localities are distributed from Turners 

 Falls, Massachusetts, to Lake Saltonstall, New Haven, Con- 

 necticut. 



The Terrestrial Vertebrates. 



Reference has already been made to the great disparity in 

 numbers of actual bone remains as compared with the foot- 

 prints, and while the number of the latter contained in our 

 museums is so great as to be unrecorded, and many more have 

 been destroyed, the skeletal remains are by no means as rare as 

 is generally supposed, for as a matter of fact no fewer than 

 three genera and five species of dinosaurs, one of a belodon, 

 and two species of aetosaurs have been described from the 

 Connecticut valley area alone, while the actual number of 

 specimens naturally exceeds this record of forms. Geograph- 

 ically, osseous remains are reported from Greenfield, Belcher- 

 town, South Hadley, and Springfield, Massachusetts ; and from 

 East Windsor, Ellington, Manchester, New Haven and Sims- 

 bury in Connecticut. The footprints occur scatteringly the 

 entire length of the valley from above Turners Falls to New 

 Haven, but the greatest abundance both of separate localities 

 and profusion of species and specimens is in the more northern 

 portion of the area, specifically around Turners Falls and near 

 South Hadley, Massachusetts. Hitchcock, in the "Ichnology 

 of Massachusetts," enumerates no fewer than 38 quarries for 

 fossil footprints, and a very few localities have been discovered 

 since that time. The geological sequence of the various fossil 

 and footprint localities is shown in the appended table. 



The creatures known from the bones are as follows : — 



Class Reptilia 

 Order Parasuchia Huxley 



Suborder Aetosauria Nicholson and Lydekker (=Pseudosuchia 

 Zittel) 



Family Aetosauridas 

 Stegomus arcuatas Marsh 



From the lower series of granitic, coarse sandstones (Fair 

 Haven arkose), New Haven, Conn. 



