174 



THE HABITAT OF THE EURYPTEBIDA 



alternating sedimentary and igneous rocks which were contempo- 

 raneous in their development with the main volcanic outpourings 

 (see sketch map, fig. 17). 



The first important fossiliferous beds are those found at Carmylie 

 and adjoining localities in Forfar. These constitute a part of the 

 famous Arbroath flags and because of their abundant eurypterid 



Haiti - 



k//omettra 



Fig. 17. Sketch Map of Scotland, Showing Localities where Old Red 

 Sandstone Outcrops 



remains are called the Pterygotus beds. In them are found the most 

 perfect specimens of Pterygotus anglicus, though complete individuals 

 are rare, and the rock often contains also an abundance of Parka 

 decipiens, which has been variously identified as crustacean egg 

 cases and as spores of plants. Above these beds follows the main 

 mass of the lavas upon which rest the beds of Auchtertyre, which 



