552 Annals ok the Carxfjhk Museum. 



CaDicrclla 7uvia/is, Batliyiirclliis minor r, 



Cteiiodonta peraciita R, Isoielus liarrisi c, 



Ctenodonta duhiafoi-mis R, hotel us obtiisus r, 



ClioiiyiJiia iiioiifrea/eiisis r, Tlialcops ovata r, 



ArcJiinacella ? defonnata r, Plio)iierops canadensis R, 



Arcliinacella ? propria r, Pcperditia canadensis c, 



Eccylioptcnis frcdericus r, Leperditia liniattila c, 



Rccyliopieriis proc/ii'is r, Einycliilina latiinarginata r. 

 Kapliistonia striatum r, 



C,.,.,,. Very hard, blue gray magnesian limestone, weathering so 

 as to show alternating light and dark stripes about an inch wide. 



24 feet 6 inches = 303 feet. 



Cj.. One layer of coarse-grained sandstone in which there are many 

 cavities, as though fossils had been dissolved out. 2 feet = 305 feet. 



C,g. Hard, magnesian limestone containing many large water-worn 

 sand grains. i foot = 306 feet. 



Phesioniys platxs r, Rapliistonia staniincuni r, 



Camcrclla vaiians r, Isotclus liarrisi c. 



Comparison of t lie Croion. Point Section witli tJiose at Chazy 

 and Valcour Island . 



A comparison of the faunas of the sections at Crown Point and 

 Valcour Island shows that there are many fossils common to the two 

 sections. There are also some marked differences, particularly in the 

 absence of sponges, corals, cystids, and of some of the common 

 species of the sections further north, notably Camarota'c/iia plena, 

 Glaphurus pustulatus and others. 



The two sections are seemingly alike in having at the base a zone in 

 which Liui^ula hi-ainerdi is common. Above this zone, which is about 

 twenty-five feet in thickness, the fauna is chiefly a brachiopod one, 

 characterized by Rafinesquina champlainensis, Rafinesquina incrassata^ 

 PhesioniYs platvs, Camerella rarians, Rapliistonia sta/uineum, Afaclur- 

 ites niagnus, Jsotelus liarrisi, Tlialeops ovata and Leperditia limatula. 



This fauna contains the four species, Rafinesquina champlainensis, 

 Plcpsiomvs platvs, Macluritcs mag/ius and Leperditia limatula, which 

 are characteristic of the second or Macluritcs maj^inus fauna at ^"alcour 

 Island. This fauna at Crown Point, comes in directly above the 



