574 Reports and Proceedings—Geological Society of London. 
the Devonian conglomerates, sandstones, and shelly limestones were 
probably deposited in a comparatively shallow sea. They contain 
Lepidodendron australe. At Rydal they abut against the uplifted 
Silurian rocks of the Bathurst area. At the end of Devonian times 
there appears to have been a long interval, during which both 
Silurian and Devonian rocks were greatly denuded, and the granite 
exposed in places. The Upper Carboniferous and Permian rocks 
were deposited in the Lithgow district, but it is doubtful if they 
ever extended to Bathurst. There is nothing to show what happened 
in this region during Mesozoic and early Tertiary times. The 
Hawkesbury Sandstone (probably Triassic) may have approached 
nearer to Bathurst than it does now. In late Tertiary times stream- 
deposits were formed on the granitic rocks, and afterwards covered 
with thick basaltic lava-flows, which have since undergone much 
denudation. 
2. “The Geology of Matto Grosso (particularly of the region 
drained by the Upper Paraguay).” By J. W. Evans, D.Sc. LL.B., 
F.G.S8. 
The district includes a portion of the Brazilian hill-country, and 
also of the low-lying plains to the south-west. 
The rocks principally dealt with are unfossiliferous, and of un- 
known age, except that they appear to be older than the Devonian. 
They may be classified as follows :— 
5. Matto Shales. (Relations not shown.) 
4, Rizama Sandstone. (Perhaps some unconformity.) 
3. Curumba and Arara Limestones. (Very marked unconformity.) 
2. Cuyaba Slates. (Strong unconformity.) 
1. Ancient crystalline rocks. 
The Devonian and later rocks are briefly described. 
3. “Notes on the Occurrence of Mammoth-remains in the Yukon 
District of Canada and in Alaska.” By George M. Dawson, C.M.G., 
LL.D., F.B.8., F.G.8. 
In this paper various recorded occurrences of Mammoth-remains 
are noted and discussed. The remains are abundant in, if not 
strictly confined to, the limits of a great unglaciated area in the 
north-western part of the North American continent ; whilst within 
the area which was covered by the great ice-mass which the author 
has described as the Cordilleran glacier, remains of the Mammoth 
are either entirely wanting or are very scarce. At the time of 
the existence of the Mammoth, the North American and Asiatic 
land was continuous; for an elevation of the land sufficient to 
enable the Mammoth to reach those islands of the Behring Sea 
where these bones have been found would result in the obliteration 
of Behring Straits. 
The bones occur, along the northern coast of Alaska, in a layer 
of clay resting on the somewhat impure “ ground-ice formation,” 
which gives indications of stratification; and above the clay is a 
peaty layer. The author considers this ‘“‘ ground-ice ” was formed 
as a deposit when more continental conditions prevailed, by snow- 
fall on a region without the slopes necessary to produce moving 
