592 



MESSRS. S. H. REYNOLDS AND C. I. GARDINER [Nov. 1 896, 



Feet. 



Calcareous flags and shales of the Chair farmyard 15 seen. 



Gap (unseen) about 40 



D. Variable limestone with shaly partings 40 



Gap (unseen) about 30 



"Exposures of red or grey limestone, sometimes horny, some- 

 times crystalline, with many fossils, are scattered over the 

 next strip of country, about 250 yards wide. We have no 

 evidence against this all being one mass of limestone, 



though beds of shale may occur in it about 550 



Gap (unseen) 20 



[ Red and grey limestone, chiefly horny 20 



t> J Green sandy shales and grits of the Earl's Well ... about 20 

 ' 1 Shaly limestone with basal breccia of shaly fragments in a 



{_ calcareous matrix 14 



» f Red, occasionally grey, horny limestone, becoming crystalline 



in places 16 seen. 



Total 765 feet. 



The red limestone (A) at the base of the Chair is partly crystalline, 

 partly horny. The two kinds iof limestone do not occur in definite 

 layers ; sometimes they appear to shade off into each other, but 

 generally they end abruptly. The crystalline limestone is chiefly 

 composed of broken crinoid-stems and fragments of trilobites, 

 especially Illcenus. The horny limestone has yielded few fossils ; it 

 is occasionally greenish, though usually red, and passes up into a 

 shaly limestone with a basal breccia consisting of shaly fragments 

 embedded in an abundant calcareous matrix. These shaly fragments 

 are sometimes so well rounded that the rock might be called a con- 

 glomerate. In places the fragments of shale are seen standing out 

 freely on the weathered surface, with their longer axes all arranged 

 parallel to one another. This band (A) is on the line of strike of 

 some greenish grit exposed farther east. 



The limestone (A) has yielded the following fossils : — 



Cyathophyllum, sp.? 



Crinoid. 



Agnostus trinodus, Salt. 



Acidaspis, sp. 



Ampyx, sp. 



Ckeirurus bimucronatus, Murch. 



Illcenus Bowmani, Salt. 



Cheinoma (Pseudosphcerexochus) cf. 



conformis, Ang. 

 Sphcerexochus latirugatus, Reed, MS. 

 Tiresias insculptus, M'Coy 

 Trinucleus (?) concentricus, Eaton 

 Remopleurides longicostatus, Portl. 

 Cyphoniscus socialis, Salt. 

 Discina cf. gibba, Lindstr. 



The next overlying beds are the green sandy shales and grits of 

 the Earl's Well. These yielded no fossils. 



Next comes the red horny limestone (B), which forms much of the 

 upper part of the Chair, and can be traced away from it both north- 

 east and south-westward. In it we have found : — Agnostus tri- 

 nodus, Salt., Cyphoniscus socialis, Salt., Cheirurus, sp., Illcenus 

 Bowmani, Salt., and Remopleurides longicostatus, Portl. 



The extreme top of the Chair is formed of rock that is not in 

 place. When followed farther north-eastward to a point due north 

 of the Chair Earm, the limestone-band (B) becomes very earthy, 

 and contains the following fossils: — Atrypa marginalis, Dalm., 



