ELIZABETHTOWN AND PORT HENRY QUADRANGLES 



69 



from the contact with the Beekmantown beds, south of Cole bay, 

 along the shore to Mullen bay, and on Crown Point peninsula. 

 Scattered outcrops occur also in the Westport area along the high- 

 way. The section of Crown point has been first described by 

 President Brainerd^ who found a thickness of 305 feet and believed 

 he recognized all three of the Chazy divisions, distinguished in the 

 type section. He gives the following section in ascending order ; 



FEET 



1 Sandstone and slate interstratified . 23 



2 Impure limestone containing Or this platys.. 25 

 Beds containing M a c 1 u r i t e s m a g n u s 



1 Dark gray massive limestone, weathering in dark 

 stripes an inch wide, containing Bucania sp. und. 



2 Tough, silicious and magnesian rock, passing into 

 a two-foot bed of pure sandstone 



200 



40 



17 



Aggregate thickness 305 



This section was later on most carefully investigated by Dr 

 Raymond^ who, by means of the fossil evidence, concluded that 

 only the middle division B (which he terms the Maclurites 

 ma gnus division) is present, the Chazy sea reaching so far 

 south only during the hight of the invasion in middle Chazy time. 

 In a later publication^ the following summary of his investigation 

 of the Crown Point section is given : 



Aj.^. Thick beds of slaty shale with occasional bands of hard, 

 fine grained sandstone. Fucoids numerous. 



25 feet 2 inches^25 feet 2 inches 

 IJngula brainerdi, a 

 Aj,_,, Ci. Impure blue limestone, rather thin bedded. 



91 feet 10 inches=ii7 feet 



Plaesiomys platys, c 

 Hebertella vulgaris, c 

 Rafinesquina alternata, 

 R. incrassata, c 

 Zygospira acutirostris, 

 Orthidium lamellosum, 

 Lingula sp., r 



Concealed 



Camarella longirostris, r 

 C. varians, r 

 Maclurites magnus, r 

 Isotelus harrisi, c 

 Leperditia canadensis, c 

 L. limatula, r 

 Eurychilina latimarginata, r 



34 feet=:i5i feet 



^Gecl. Soc. Am. Bui. 1891. 2:300. 



2 Am. Pal. Bui. 14. 1902. 



■3 Carnegie Mus. Ann. 1906. v. 3, no. 4, p. 551. 



