LOWER SILURIAN SYSTEM OF EASTERN MONTGOMERY CO. 455 



5 Streptelasma profundum Hall (c) 



6 Streptelasma comiculum Hall? (r) 



7 Columnaria alveolata Goldfuss (aa) 



8 Zygospira recurvirostra Hall (c) 



9 Rafinesquina alternata (Con.) Hall and Clarke (r) 



10 Asaphus platycephalus Stokes (r) 



11 Lepertiitia fabulites Conrad (a) 



12 Orthoceras, sp. (r) 



13 Crinoid segments (a) 



The fauna of the Trenton, nos. 5 and 6, is as follows : 



1 Monticulipora (Prasopora) lycoperdon Say (a) 



2 Streptelasma, sp. (r) 



3 Stictopora elegantula Hall (c) 



4 Stictopora ramosa Hall? (r) 



5 Subretepora reticulata Hall (rr) 



6 Tetradium columnare Hall (rr) 



7 Schizocrinus nodosus Hall (aa) 



8 Rafinesquina alternata (Con.) Hall and Clarke (aa) 



9 Plectambonites sericea (Sowerby) Hall (c) 



10 Orthis (Dalmanella) testudinaria Dalm (c) 



11 Orthis (Dinorthis) pectinella (Emm.) Hall (r) 



12 Rhynchotrema capax (Con.) Hall and Clarke (r) 



13 Cyclospira bisulcata (Emm.) Hall and Clarke (rr) 



14 Raphistoma lenticulare Emmons? (r) 



15 Murchisonia bellicincta Hall (r) 



16 Murchisonia gracilis Hall (r) 



17 Murchisonia, sp. (r) 



18 Asaphus platycephalus Stokes (c) 



19 Trinucleus concentricus Eaton (r) 



20 Dalmanites callicephalus Hall (r) 



21 Leperditia fabulites Conrad (c) 



The above section is of interest from the fine exposure of 

 the Trenton limestones excellently adapted to the collection of 

 fossils, and from the fact that it afifords an excellent opportunity 



for determining the south dip of the strata by comparison with 

 the exposure of Van Epp's hill exactly one mile to the north. 

 The base of the Trenton on Van Epp's hill is approximately 590 



