GEOLOGY OF THE REMSEN QUADRANGLE 



19 



stream bed the southward dip of the strata permits an exposure 

 of only 270 feet of the rocks. 



The lower Trenton limestones are dark bluish gray, thin bedded 

 and fine grained with occasional coarser grained layers inter- 

 stratified. Thin shale partings are nearly always present. On 

 account of the dip the lowest beds are not found at the end of the 

 gorge, but in the "Narrows" just above the power house. Accord- 

 ing to Prosser and Cumings 1 these rocks contain the following 

 fossils : 



1 Monticulipora (Prasopora) lyco- 



perdon (Say) 



2 Diplograptus amplexicaulis Hall 



3 Trematis terminalis (Emmons) 



Hall 



4 Rafinesquina alternata (Con.), 



Hall & Clarke 



5 Strophomena cf. scofieldi Winch. 



& Schuch. 



6 Orthis (Platystrophia) biforata 



(Schl.) Bill. 



7 O. (Dalmanella) testudinaria 



Dal. 



8 Plectambonites sericeus (Sow.) 



H. & C. 



9 Zygospira recurvirostra Hall 



10 Bellerophon bilobatus (Sowerby) 



11 Asaphus platycephalus Stokes 



1 2 Calymmene callicephala Green = 



C. senaria Con. 



13 Ceraurus pleurexanthemus Green 



(?) 



14 Crinoid segments 



The middle Trenton limestones are mostly dark bluish gray, 

 thin bedded, compact and with pronounced shale partings. 

 According to Prosser and Cumings the middle Trenton fossils 

 include : 



Monticulipora (Prasopora) lyco- 



perdon (Say) 

 Stictopora sp. 



Rafinesquina deltoidea (Con.) 

 H. & C. 



Orthis (Platystrophia) biforata 



(Schl.) Bill. 

 O. (Dalmanella) testudinaria Dal. 



6 Plectambonites sericeus (Sow.) 



H. & C. 



7 Tellinomya dubia Hall 



8 Endoceras proteiforme Hall 



9 Cyrtoceras sp. 



10 Asaphus platycephalus Stokes 



1 1 Crinoid segments 



The upper Trenton limestones are also dark bluish gray, thin 

 bedded, and divided by shaly partings. The more compact strata 

 are frequently interstratified with others which are somewhat 

 crystalline. The upper 26 feet are light gray, coarse grained, 

 crystalline limestones in thick beds which are separated by 

 very thin shale partings. These coarse grained rocks are full 

 of fossil fragments and are best exhibited in the quarries 



