BUFFALO SOCIETY OF NATURAL SCIENCES 1 75 



have yielded Cephalaspis lyelli, Pteraspis mitchelli, and certain of the 

 Acanthodian fishes. At a slightly higher horizon and contemporary 

 with some of the volcanic beds is the Acanthodian zone which is best 

 seen at Tilliewhamland Quarry, Turin Hill, near the town of Forfar. 

 The list of fossils from these beds cited by Goodchild is as follows 

 (80,597): 



Mesacanthus mitchelli 

 Ischnacanthus gracilis 

 Climatius scutiger 

 C. uncinatus 

 C. reticulatus 

 Parexus recurvus 

 P. falcatus 



Euthacanthus mitchelli 

 E. elegans 

 E. gracilis 

 E. curtus 

 Cephalaspis pagei 

 C. asper 

 Thelodus pagei 

 Pterygotus anglicus 

 Stylonurus ensiformis 

 Parka decipiens 



Just above the top of the volcanic series has been found a fossiliferous 

 zone yielding myriopods among which are Kampecaris and Archi- 

 desmus, as well as some poorly preserved plants referred to Psilo- 

 phytum robustum. The top of the Caledonian Old Red is formed 

 by the Strathmore sandstones which are well developed in the 

 Strathmore lowland of Forfar, but the exact age of which is difficult 

 to determine because of the lack of fossils. It has been thought that 

 they might be contemporaneous with the oldest beds of the Orcadian 

 division, but conclusive evidence is lacking. 



The Siluric Stonehaven beds of red sandstone and interbedded 

 bright red shales are exposed in the neighborhood of Stonehaven and 

 are about 1500 feet thick. Upon' these follows the Dunnottar con- 

 glomerate, 5000 feet thick, of coarse red and grey sandstones, grits 

 and conglomerates in which occur pebbles which commonly "range 

 up to a foot or more in length, and yet are astonishingly well rounded. 

 They mostly consist of quartzite" (117, 399). Interbedded lavas 



