298 



Anabaia anticostiana 



A. depressa 



Cornulites flexuosus 



C. distans 



Calymene tuberculata 



Acaste downingiae 



Dalmanites sp. 

 The thickness is 288 feet (87 m.). 



Zone 3. — Green shales, in places sandy. Interbedded 

 are numerous layers and lenses of fine-grained sandstones 

 with fine cross-lamination. The strata are much disturbed 

 in places, but the units of fracture are much larger than 

 in the preceding zone so that there are few places where 

 the bedding is confused. The zone ends at the top of the 

 formation. The fossils which have been identified are: — 



Monograptus clintonensis 



M. priodon chapmanensis 



Retiolites geinitzianus venosus 



Orbiculoidea tenuilamellata 



Dalmanella elegantula 



Leptaena rhomboidalis 



Chonetes tenuistriatus 



Camarotoechia near equiradiata 



C. cf. obtusiplicata 



Rhynchonella cf . robusta 



Wilsonia cf . saffordi 



Anoplotheca hemispherica 



Serpulites cf. dissolutus 



Cornulites distans 



Pterinea emacerata 



P. rhomboidea 



P. honeymani 



Modiolopsis? cf. primigenis 



Dalmanites, fragments of Eurypterus, and Conularia. 

 The thickness of the zone is 365 feet (no m.) 

 McAdam formation. — The strata of this formation 

 consist of papery and splintery shales, and argillaceous 

 and sandy limestones. The attitude is more regular and 

 uniform than in the preceding formation and there are 

 fewer zones of marked disturbances. In the shore cliffs 

 the lower portion is cut out by faulting, but the missing 

 strata can be well seen in the gorge of Arisaig brook. The 

 formation has been separated from the Ross Brook form- 

 ation on both lithological and faunal grounds though 



