Eastern Kansas and Nebiaak. 161 
others have been seen, all of which differ widely from those _ 
known from the great Subcarboniferous limestones below the 
horizon of the Millstone grit. 
The next locality examined by Mr. Marcou is at the village of 
Plattesmouth, some fifty miles farther up the Missouri by an air- 
line. Here he saw another exposure of rocks, some forty-five 
to fifty feet in thickness, composed of grayish and dark eolored 
clays, 11 places streaked with red, together with a six-foot stra- 
tum of yellowish dolomitic limestone; all of which he says 
agree lithologically with the Lower Trias of France and Ger- 
many—Permian of authors, (= Dyas of him), to which horizon 
he refirs them. As these beds, however, differ somewhat in 
color and composition from those seen at Nebraska City, he 
thinks they belong to another and lower division of the so-called 
yas, which, as its name implies, consists of two divisions in 
Europe, and consequently must be expcetde to present the same 
feature in this country. 
e type specimens upon which this 6 wee — 
red fe | 
Measures of the Alleghany Mountains, Pennsylvania, under 
the name Petalodus allaplacianals (See Meek & Hayden's paper, 
eed. Acad. Sci. Philad., Jan., 1859, p. 17.) 
As already explained, the species referred by Mr. Marcou to 
Spirifer Clannyanus is the S. plano-convexus Shumard, which was 
Sriginally described from this very locality. Spirigera subtilita 
all know to be a common characteristic -measure species, 
