AET. 18 AGE OP NORTH AMERICAN TRIASSIC BEDS ^VON HUENE 5 



A. Fossils of probable Middle Triassic age — Continued. 



Texas. — Sand Creek, Holmes Creek, and east bank of Blanco River near 

 Spur, Crosby County — 



Desmatosuchus spurensis Case. 

 Promystriousuchus oehlersi Case. 

 Leptosuchus crosbyensis Case. 

 Many Parasuchian bones. 

 Metoposaurus jonesi Case. 

 Buettneria, perfecta Case. 



B. Fossils of certain Upper Triassic age, from beds at Cerro Blanco, near 

 Gallina, New Mexico : 



Episcoposauriis horridus Cope. 

 Typothorax coccinarum Cope. 

 Gen. undet. scolopax Cope. 

 Coelophysis longicollis Cope. 

 Coelophysis hauri Cope. 

 Coelophysis wilUstoni Cope. 



C. Fossils of uncertain level but thought to be Upper Triassic : 



Arizona. — Near Tanners Crossing, Little Colorado River, in Yellow argil- 

 laceous sandstone — 



Episcoposauriis horridus Cope. 



Typothorax coccinarum Cope. 



Three small saurischian vertebrae. 

 Texas. — West side of Blanco River, Crosby County — 



Typothorax, species." 



?" Phytosaurus " doughti Case. 



1" Phytosaurus " superciliosus (Cope). 



?" Episcoposaurus " haploceras Cope. 



" Coelophysis,'' species." 



The Middle Triassic fauna (^), with many primitive Para- 

 suchians and some Labyrinthodonts but very few other forms, is 

 distributed through Wyoming, Colorado, Utah, Arizona, New 

 Mexico, and western Texas. The Upper Triassic fauna (^), as 

 characterized by Typothorax., Ej)iscoposaui^s., and Coelophysis., has 

 only been found high above Poleo sandstone ( — Shinarump con- 

 glomerate). Probably the same and similar fossils in Arizona and 

 Texas belong to an equivalent horizon. 



II. Atlantic coast region. — Triassic deposits to an enormous thick- 

 ness are lying discordantly upon ancient rocks along the east slope 

 of the Appalachians. According to Lull, they are more than 4,000 

 meters thick in Connecticut and Massachuetts. Near the base of the 

 upi^er half they are divided hj three great seams of diabase which 

 lie nearly horizontal with vertical thicknesses up to 400 meters. In 

 the Connecticut basin, near the upper limit of the lower part — that 

 is, below the so-called " anterior trap sheet " — ^there have been found 

 the following Parasuchians : Rutiodon (?) valiclus Marsh, R. (?) 

 manhattanensis Huene, and Stegomus arcuatus Marsh. Tracks have 

 not yet been found there. They occur for the first time between the 



"Case, E. C, Pub. 321, Carnegie Institution of Washington, 1922, p. 81, flg. 31. 

 3060—26 2 



