65 
This species is common at certain localities in the Patapsco formation, 
the uppermost formation of the Potomac Group in Maryland and Virginia. 
It is also exceedingly common in the Cheyenne sandstone of southern 
Kansas and appears to have survived into the Dakota sandstone where it 
is represented by leaves that have been described under other names. It 
is an important item in fixing the age of the flora found in the Upper 
Blairmore. 
Sapindopsis belviderensis Berry (?) 
Plate IX, figure 6 
Sapindopsis belviderensis Berry, U.S. Geol. Surv., Prof. Paper 129, p. 216. 
Pis. 49-54 (1922). 
The single small fragment figured and its counterpart are unfortunately 
all that represent this species in the Upper Blairmore, and I have, there- 
fore, queried the identification, although I entertain but slight doubt as to 
its correctness. All of the features in so far as they are shown in such 
limited material are those of this species, and I know of nothing else with 
which they might be confused. It is much to be hoped that additional 
material will be collected. 
The type is very abundant in and characteristic of the Cheyenne 
sandstone of southern Kansas, to which, with this exception, it is confined. 
The species is very important in fixing the age of the Upper Blairmore 
within narrow limits. 
Locality CB3. 
