CORRELATION AND CONCLUSIONS 



From the measurements it will be seen that B 6, 7, 8, 9 cor- 

 respond to C 9 and 10. B 14, 15, 16 are the same la5^ers as C 12 

 and the lower 7 feet of C 13. The gap at B 5 is filled by C 3 to 

 8; and B 10 to 13 exhibits the strata covered by the rubbish east 

 of the fort (C 11). All of sedlion A is below the base of C. 



The Chazy in this secftion is not capable of the same subdi- 

 visions as at Valcour Island and elsewhere to the northward. At 

 the base there is a well-marked zone of shale and hard magnesian 

 limestone, 25 feet in thickness, containing Lingula brainerdi and 

 fucoids in abundance. This zone is also well shown at Valcour 

 Island, where it is 26 feet thick with the base not shown. There, 

 in addition to the numerous Lingtdce, it contains other fossils. 



Above this zone, the measures consist of more or less impure 

 limestones, usually thin bedded and often shaly. Madurea magna, 

 Rajinisquina champlainensis, Dinorthis defleBa (?), Camarella 

 varians and Asaphus canalis are found almost everywhere in these 

 strata except for a few feet near the top. CamarotLVchia plena 

 Hall, which is so abundant in the upper part of the more north- 

 ern sections, is not found here. Raphistonia planistria vz.r. par- 

 vum Hall, which, by its abundance, charadlerizes a zone in the 

 upper part of the mass at Crown Point, is also abundant in a zone 

 about 90 feet below the top at Valcour Island. However, the 

 accompanying fauna is quite different. The species provisionally 

 identified as Dinorthis dcJIeHa Conrad occurs abundantly in many 



