Vol. 58.] 10 THE PHYSICAL GEOGRAPHY OF THEIR AGE. 195 
(rather rounded) measured roughly 4x3x 38 yards." Among these 
blocks, as is well known, more than one variety of granite is 
represented,” some of them not corresponding with any now visible 
in the Alps, and one, a porphyritic variety, much resembling a 
granite in the Schwarzwald. 
The second locality is in the Valley of the Grande Kau, above 
Fig. 2.—Breccia in the Flysch, between Le Sepey and Atgremont. 
Slabby, sometimes shaly limestone. 
Breccia; about 2 feet, slightly irregular. 
Shale; about: 3 inches. 
Limestone ; ; about 23 feet. Slabby in the upper part. 
Breccia; perhaps 3 feet thick. Base a little uneven. 
Or Hs Co bo Re 
eu Ul Ut Al 
Le Sepey,® where a fine series of sections is exposed in cuttings for 
about half a league on the lower part of the road to Ormont Dessus, 
as well as on that which turns up from it to Comballaz. These 
exhibit a series of bedded limestones (dark), mudstones, grits, and 
breccias, forming apparently an ascending series, and dipping 
variably but, as a rule rather steeply, in a south-easterly direction. 
As this is a region of great folds and faults, repetition is possible ; 
but, so far as I could see, the succession was generally undisturbed. 
The following is a summary of the principal facts :—The breccia, 
in which signs of stratification may be detected, is regularly inter- 
bedded with limestones, mudstones, or grits, passing at the top or 
bottom (generally rather rapidly) into one or other of them, but in 
the case of the first or second a thin layer of grit may intervene. 
Beds of breccia are numerous between Le Sepey and the ravine of the 
Raverettaz, varying in thickness from less than 18 inches to several 
yards, but apparently becoming thicker and coarser as they ascend. 
On approaching that ravine we find a thick mass of grit or gritty 
limestone setting in, which passes locally and rapidly into a breccia, 
the coarser parts of which are usually characterized by abundant 
small fragments of a dark slaty or shaly carbonaceous rock, giving 
} Murchison mentions, in Quart. Journ. Geol. Soc. vol. v (1849) p. 212, a 
block which measured 35 x 30 x 15 yards, or not less than 400,000 cubic feet in 
volume, 
* Some years ago I saw at least six different varieties in the Berne Museum. 
? I ascertained the principal facts during a hurried visit in 1891, and made 
a more careful examination last summer (1901). 
Q.3.G.8.. No. 230. P 
