Prossee and Cumings — Lower Silurian Sections. 



685 



J5 4 . Above the shale is the massive Calciferous sandrock, seventy- 452=^9 

 four feet of which is exposed in the wall of the quarry. This part of the for- 

 mation is composed principally of compact, thick-bedded, greyish calcareous 

 sandstone that has been quarried. In the lower part are occasional shaly 

 partings, similar to B 3 , but no fossils were found in them. This quarry is 

 shown in Plate VIII, where Mr. Birch stands on what is said to be the top 

 of the gneiss, the two heavy layers at the base of the cliff being the sandstone 

 of B 3 ; the stratum of fossiliferous shale is marked by the hammer, while 

 above is the massive Calciferous sandstone. 



In the fields above the Boyer quarry the rocks are partly covered, yet 

 there are sufficient exposures to make possible the determination of the top 

 of the Calciferous. In the upper part it is thinner bedded than in the lower. 

 No fossils were found. 



B h . On the Bitter farm, near the house, is a ledge composed of 5=^*4 

 thin layers of compact, fine-grained, dove-colored limestone, containing vertical 

 tubules filled with calcite similar to the small ones found near Newport and 

 referred to Plujtopsis. The thickness is approximately five feet and it is 

 referred to the Birdseye limestone. 



JB 6 . For fifty-three feet above the Birdseye the rocks are covered, 10 J ff t 68 

 when a ledge of Trenton limestone, five feet thick, appears. The rock is a 

 crystalline greyish limestone and contains an abundance of Trenton brachio- 

 pods. Above this ledge forty-six feet are covered before the base of the black 

 shale is reached; but it is probable that nearly if not all of this 104 feet 

 belongs in the Trenton. The following species were obtained from the five- 



foot stratum: 



1. Rafinesquina alternata (Con.), Hall and Clarke. (aa) 



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



3. Orthis (Dalmanella) teshtdmaria, Dal. (c) 



4. Moiiticulipora (Prasopont) lyeop&rdon (Say). (a) 



5. Calymene eallicepltala, Green. (r) 



6. Asaphus platycephahis, Stokes. (r) 



7. Orthis (Dinorthis) pectinella (Emm.), Hall. (r) 



8. Orthoceras sp. 



9. Zygospira reeu/rvvrostra, Hall. (r) 



10. Trinucleus conc&ritricus (Eaton), Hall. 



11. Eseharopora recta, Hall. (r) 



12. Crinoid segments. 



