Pkosser and Cumings— Lower Silurian Sections. 



645 



On the liver bunk a little west of the quarry and apparently forming the 

 bottom of the river is the top of the Calciferous sandrock. 



From the thin-bedded Trenton limestone of A 4 the following species 

 were collected : 



I. 



Plectambonites sericea (Sowb.), H. and C. 



(aa) 





Ortltis (Dalmanella) testvdina ria, Dal. 



(aa) 



3. 



Orth is (Diiiortlds) pectinella, Emm. 



(c) 



4. 



Mschara/pora recta, Hall (?). 



. (r) 



5. 



Stictopora acuta, Hall (?). 



(rr) 



6. 



Stictopora ehganiula, Hall. 



(rr) 



7. 



Asaphus platycepJialns, Stokes. 



(c) 



8. 



Cera urns pl&wrexanthemus^ Green. 



0) 



9. 



Rajinesquma alternata (Con.), H. and C. 



(a) 



10. 



Leper dit ia fabu lites, Con. 



(e) 



11. 



RhyTwhot/rema capax (Con.), H. and C. 



(c) 



12. 



Murchisonia gracilis, Hall. 



(c) 



13. 



Mi(/rchisonia hetticincta, Hall. 



(c) 



14. 



Ra/phistoma lenticulare, Emm. 



(c) 



15. 



Endoceras protei forme, Hall. 



0') 



16. 



Schizocrinus nodosns, Hall. 



0) 



17. 



Modiolopsis mytiloidcx, Hall (?). 



(rr) 



On 



the upper side of the railroad, a short distance 



cast 



Hill station, is a large quarry in the upper part of the Calciferous formation. 



The section from the base to the top is as follows: 



XLIV B\ Compact, blue, somewhat " fucoidal" limestone. 214 = ly, 

 IP. Dark grey, non-fucoidal limestone in one to three layers, 3 F i e 5 t i^ 



showing yellow streaks on weathered surface. 



B A . Massive drab to light grey limestone in one or two heavy s^=\ t 



layers. Weathered surface finely mottled by horizontal streaks. Fucoidal 



limestone. 



R 4 . Strongly fucoidal massive beds of bluish-grey color, capped jji?^ 

 by a dark blue thin layer containing Ophileta complanata, Van. 



R 5 . Medium thick beds of arenaceous limestone which weathers gftfgo 

 to a buff. 



Z? 6 . Two i avers of Calciferous immediately back of the crest of 

 the quarry. 



The entire quarry is composed of Calciferous sandrock, though there is a 

 four-inch layer " Birdseye limestone just above it and apparently in place. 



