504 Annals of the Carnegie Museum. 



mag/ius, but full of large light-colored wavy masses, resembling Sfro- 

 matoceriiiin. Above this appears the dove-colored limestone with 

 bands of niagncsian limestone. W'e find here Cyrtoceras boycii, Ortho- 

 ceras titan, Placoparia multicostata,'^''' Lie has cha>?if'Iai?ierisis,^'''' Illicniis 

 sp. ind. and Bucauia sp. ind. 



" The upper portion of the Chazy is abraded and covered by a 

 marsh. Total thickness probably 640 feet." 



Plattsbiirgh, Ne7v York. 

 The following description of the Chazy outcrops in the vicinity of 

 Plattsburgh, New York, is given by Professor H. P. Cushing in the 

 Report of the New York State Geologi.st, 1895, pages 503 to 573 : 



" The Chazy is exposed at Pluff Point and also north of Plattsburgh, 

 where it lies just to the east of the Calciferous exposures. Bluff Point 

 is a conspicuous topographic feature, rising sharply to an altitude of 

 170 feet above the lake and being the only high ground along the 

 shore in the county. It is a block fault with a resistant stratum on its 

 summit. Nearly the whole middle division and about 100 feet of the 

 lower part are shown here, and, with the Peru section, form a good 

 exhibit of nearly the whole Chazy. 



"The whole series is characteristically fossiliferous. Along the 

 lake shore, near the boat-landing, the Maclitrea beds are shown and 

 also contain a large Strophomenoid form resembling Rafinesquina 

 alternata^'' Other fossils occur. 



" The Chazy north of Plattsburgh is much faulted. At the Normal 

 School beds of Lower Chazy age are exposed, and are succeeded just 

 beyond the race track by the lower Machirea beds. These continue 

 a distance of nearly a mile with a sinuous strike. They consist mainly 

 of massive, nearly black limestones, and are largely quarried. With 

 these are thin-bedded, rather shaly bands with an abundant brachiopod 

 fauna. 



<' Just beyond the three corners, a little over a mile north of Platts- 

 burgh, is an east and west fault bringing up again the upper beds of the 

 lower division on the north side. This is followed by the ATacIurea 

 beds again, and thence northward the entire Machirea division and 

 a large part of the upper Chazy appear within a mile, the latter well 



'^^ Pliomerops canadensis. 

 IS Ainphilichas niinganensis . 

 1' Rafinesquina champlainensis. 



