36 
The American Geologist. 
Jan. 1890. 
of the same formation. In different places good exposures of 
the quartzite, in situ, aff'ord excellent opportunities for the 
study of the included Scolithus. 
The writer has been 
for several years care- 
fully examining such 
exposures in the hope 
of discovering the 
exact nature of the 
fossil. Though fail- 
ing in the main ob- 
ject, he has noticed 
that all casts, in every 
exposure thus far ex- 
amined, are flattened. 
Fig. 1 represents 
two average spec- 
imens, with sections 
of the same showing 
the extent to which 
both are compressed. 
Fig. 2 is a section 
of the most circular 
of a hundred casts 
picked up at random ; Fig. 3, a section of the most flattened 
of the same lot. 
Fig. 4. represents a cast to which part of the enclosing 
quartzite adheres, in the form of thin wings — a ver}^ common 
occurrence in those specimens most compressed. 
The significant feature in connec- 
nection with these flattened cylin- 
ders is the fact that they are all 
elongated, in situ, in the same direc- 
tion ; and further, that the longer 
axes of their sections are parallel to 
each other and parallel to the direc- 
tion of the strike of the quartzite. 
In Fig. 5 we have represented a 
typical exposure of the quartzite. ^^--/^ 
The dip of the strata is S. 30°, E. 35°. Fig. 2. Fig. 4. 
The area represented is a very conchoidal and irregular 
/"^ 
Fig- 3- 
