328 The Original Chazij Rocks — Brainerd and Seely. 
six miles distant, where Chazy limestone on the west is in 
juxtaposition with Utica Slate on the east. 
The Strata of Group A. 
The lowest group of Chazy rocks as above described, were 
placed in the Calciferous formation by Prof. Emmons, and 
the exposure along section I is the one referred to in the 
N. Y, Geology of 2nd Dist., p. 311. Prof. Hall, however, in 
his N. Y. Paleontology, published four years later, in 1846, de- 
scribes the fossils of these strata as belonging to the lower part 
of Chazy. The lowest strata (A. 1 and 2) are seen only along 
section T, forming south of Mrs Bugby's house a ledge twenty 
or thirty feet in liight partially covered with soil. 
After going south-easterly across a low valley, where the soil 
conceals about forty feet of the rock, we reach a second ledge 
in which 4, 5 and 6 of Group A are well exposed. Especially 
favorable for study are the Orthis beds on the east slope of the 
ledge, where the rock has been quarried for railroad abutments' 
The strata may also be studied to advantage at the north end 
of section II where they form a ledge somewhat wooded, over 
thirty feet in hight, with abrupt, broken edges on the north- 
east and an even slope with the bedding to the west and south. 
We found this an excellent locality for Scalites angulatus, 
which is rarely obtained except in weathered sections. 
After another unavoidable hiatus of twenty feet, we reach the 
crinoidal beds, (A. 8.) These are best seen along section II 
following the curving strike either to the east or the west. 
The stratum with red spots has furnished a beautiful and val- 
uable marble. The Burlington Manufacturing Co. sell it ex- 
tensively for furniture and indoor work. It has been quarried 
somewhat where the Tracy brook runs over its beds, as shown 
in the map. At least two other quarries have been 0{)ened 
between Chazy and Plattsburgh. It has also been quarried on 
the west shore of Isle la Motte just south of Fisk's Landing. 
The Strata of Group B. 
The middle group consists largely of the well known massive 
beds of limestones, easily recognized wherever found by the 
spiral seal of Maclurea magna stamped upon its weathered 
surfaces. Along section II the lower bed of fifty feet in 
thickness is to be seen, resting upon the crinoidal beds below, 
