GEOLOGY-VOLCANIC TUFAS OF PSUC-SEE-QUE CREEK. 
47 
below ; a single column often being formed of several successive differently colored layers ; 
tbe prevailing colors being pink, white, orange, blue, gray, and lilac, and these colors 
frequently strongly contrasted, producing a very peculiar and pleasing effect. 
No. 1, columnar trap. 
Nos. 2,4, 6, 8,10,12,14,16,18, 20, 22, 24, soft tufas, 
and infusorial marls. 
Nos. 3, 7,13,17, 21, 23, harder tufas. 
Nos. 5, 8,15,19, concrete. 
No. 11, trap. 
SECTION OF BANK OF PfUC-SEE-QUE CREEK. 
Near tbe base of tbe series was a stratum of three feet in thickness, composed for tbe most 
part of brilliant white felspatbic pumice, so soft as to be easily crumbled in tbe fingers. This 
pumice was in somewhat rounded masses, averaging less than an inch in diameter, and 
Concrete, brown. 
White ^ 
Blue 
White 
Blue 
- Tufas. 
Pink 
Brown 
Pink 
Concrete, gray. 
COLORED TUFAS, PSUC-SEE-QUE CREEK. 
cemented by a fine lilac colored clay. The general aspect of this layer was that of marbled 
paper, tbe spots being pure white and tbe interstices lilac. A line of dark carbonaceous matter, 
less than a quarter of an inch in thickness, marked the line of separation between this stratum 
and another of nearly the same thickness, which was blue in color, having the texture of soft 
pulverulent eoarsish sandstone. The under surface of this layer was pierced in every direction b} r 
holes as large as straws, left by the decaying branches of some small plant which had apparently 
grown from the carbonaceous surface below. The appearance presented by these impressions of 
