NIAGARAN (aNTICOSTIAN) SERIES 711 



Feet 

 Dg. North shore. The equivalent of these zones is seen to great ad- 

 vantage at East Cliff, where about 150 feet of limestone with 

 some shales occur. 



The lower 30 feet of this section is a coral reef of corals and 

 coral conglomerate, with some nodular limestone. These strata 

 also make up the submerged East Cliff reefs, and because of 

 their very rough character are very dangerous to navigation. 

 The fossils are essentially corals — Stromatopora, Favosites 

 gothlmidicus (mural pores seen), F. favosus, 8trov}J)o<lcs dif- 

 flucns, Eridopliyllum cf. multicaule, Hahjsites 2 species, Platy- 

 strophia Mforata (same in Cg), Leptwna rhomhoidalis, Schu- 

 chertella pecteh, Pentameriis ohiongus (rare), Rliynclionella 

 Mdens, Atrypa reticularis, Anoplotlieca hem i spheric a, and an 

 abundance of ostracoda. 



The coral reef is followed by about 10 feet of blue limestone 

 with shale partings, above which are 40 feet of granular lime- 

 stones also with shale partings. Here the corals are rare and 

 do not make reef limestone. Slabs are covered with small 

 bryozoans and Clinton ostracoda. Other fossils are Rafines- 

 quina profunda, Brachyprion leda, SchiicJiertella pectcn, Rhyn- 

 chonella Mdens, Atrypa reticularis, Anoplotheca hentisplicrlca, 

 Homwospira n. sp., Hyattella congesta, and Stricidandina lens. 



The above zone is followed by another that may be called the 

 Hyattella congesta zone because of the abundance and large 

 size of this brachiopod. The lower 35 feet are bluish gray 

 thin-bedded nodular limestone with shale partings, followed by 

 10 feet of granular shell or pentameroid limestone. The more 

 common fossils are Favosites gothlandicus, HelioUtes exiguus, 

 Cornulites, Plectanihonites traiisvcrsalis, Braclnjprion leda, 

 Rhynchonella Mdens, Atrypa reticularis, Hyattella congesta 

 (very common in the lower 35 feet and rare in the upper 10 

 feet, where the shell is seen for the last time), Stricklandinia 

 lens, 8. lirata, and Pentameriis oMongas (the pentameroids 

 here becoming very abundant). 



The highest strata of East Cliff are 30 feet of grayish brown 

 nodular limestone with fewer fossils, followed by the terminat- 

 ing 10 to 15 feet of gray to white shell limestone abounding in 

 the pentameroid Stricklandinia lens. Other fossils are Raflnes- 

 quina profunda, Orthis ftahellites, Atrypa reticularis, Anoplo- 

 theca hemispherica, and Tremanotus. 



Correlation. — An inspection of the fossils cited in the various beds of 

 the lower part of the Gnn Eiver formation {Hyattella congesta beds) 

 will show that the fauna clearly has the impress of "Clinton" time, using 

 this term in the widest sense. This is seen in the following species : 

 man}^ of the corals, Phcenopora expansa, Helopora fragilis, Rkipidomella 



