287 



Crinoidea sp. (segmeuts). 



Pentremites sp. 



Rhombopora sp. near tabulata 



Ulrich. 

 Rhombopora sp. 

 Stenopora sp. 



Fenestella cestriensis? Ulrich. 

 Fenestella flexuosa Ulrich. 

 Fenestella sp. 



Polypora spinnlifera Ulrich. 

 Polypora cestriensis Ulrich. 

 Lioclema araueuiu Ulrich. 

 StreblotrjTDa nicklesi Ulrich. 

 Fistulipora excelens? Ulrich. 

 Archimedes distans Ulrich. 

 Archimedes sp. 



Dielasma sp. 



Productiis sp. 



Spiriferina transversa McChes- 



ney. 

 Spiriferina spinosa N. & P. 

 Spirifer leidyi N. & P. 

 Eumetria marceyi Shumard. 

 Brachiopod sp. 

 Aviculopecten c. f. monroensis 



Worthen. 

 Orthonychia chesterense M. & W. 

 Spirorbis c. f. imbricatus Ulrich. 

 Griffithides granulatus Weth- 



erby. 

 Cladodus sp. (base of tooth). 

 Fish sp. (spine). 



Discussion of fauna. From the foregoing lists, it will be seen that 

 the fauna of the lower and middle limestones have many of the elements 

 of the Salem fauna. This is particularly true at the eastern extensions 

 of these beds where, in all probability, the shallow, lagoonal conditions 

 fiivorable to this fauna, prevailed. 



The lower limestone in section I has only two species which do 

 not occur in the Salem limestone. These are Martinia cantracta and 

 Batostoniella ahruptal The latter was not found in the middle limestone. 

 The western extension of the lower limestone retains a few of the Salem 

 species but indicates a condition of deposition farther from the shore-line. 

 To the west it also contains BatosioincUa ahrupta. In the collections from 

 the lower layer, foraminifera are ^ery scarce. 



Collections from the middle limestone show that many Salem species 

 continued to exist, but Mariinia contract a is the most noticeable species, 

 find Pentremites becomes a prominent member of the fauna. Thin sections 

 from this horizon show under the microscope a great number of forms of 

 foraminifera, and will undoubtedly yield many species, an element which 

 will distinguish this limestone wherever found. 



The faunal character of tJic upper limestone is entirely distinct from 

 that of the two lower layers. It is of late Chester age and shows no dis- 

 tiupt Salem forms. 



