372 
THE GEOLOGIST. 
the mammotli, the great hcrbivora, and tlie cave-animals ? Have any investi- 
gations of the deposits in wliich snch relics have been found been made 
with sufficient care in any instance to determine their proper geological age ? 
I think such cases are well worthy of consideration in reference to the present 
liiglily interesting geological topic. — Yours trvily, P. S. A., London. 
Cretaceous Rocks in Norfolk and Suffolk. — Sir, — On what geological 
formation are tlie cretaceous rocks in Norfolk and Suffolk su]ierposed. — T. 
Ward, Ickworth. — For the most part, we believe, on tlie Kimmcridge Clay. 
REVIEWS. 
Geological Survey of Canada. — Report of Progress for 1857. Toronto : J. 
Lovell. 1858. 
The report of progress of the geological survey of an important colony like 
Canada must always be, whatever the merits of the report, a matter of 
nnich interest. It is a matter of interest alone to know how much or how 
little has been accomplislied. The report which has recently been forwarded 
to us is that for the year 1857, presented to the Legislative Assembly on the 
31st March, 1858. _ 
One interesting item in it is the survey of the Huronian formation (the 
equivalent of our " Longmynd" rocks) along the north shore of Georgian Bay, 
the chief seat of copper-mining in Canada. 
The rocks of this region are much distorted and dislocated, and those ex- 
amined in the district around Lake Echo are altogether of Huronian age, with 
the exception of the flat parts near the shores of Lake George and the St. 
Mary river, which are probably unconformable SUurian strata. In order to 
follow out the structure of these altered and contorted Huronian rocks, a band 
of associated limestone was selected as the best developed feature, as well for 
its peculiar mineral character as from the presence above and below it of a 
very remarkable conglomerate. This band was followed for considerable dis- 
tances, and is about two hundred feet in thickness. It presents alternate 
layers of pale blue or whitish limestone and greenish calcareous and sUiceous 
slate, usually in thin strata. About the middle of the mass there is a calca- 
reous breccia, generally iu a massive bed, containing angular fragments of 
greenstone, trap, and dark blue or blackish impalpable grained slate. 
The slate-conglomerate, both above and below the limestone, contains 
numerous rounded pebbles of various kinds, chiefly of syenite, quartz, gneiss, 
and jasper. The rocks beneath the lower slate-conglomerate are greenish 
siliceous slate and pale greenish quartzite ; these are underlaid by greenstone, 
and below is a highly altered green cldoritic slate, which is exposed in nearly 
vertical strata, forming high precipices at the extreme head of the lake. 
Above the upper slate-conglomerate a tliinly laminated dark blue or blackish 
slate of very tine texture was observed interstratilicd with thin beds of dark 
grey quartzite, overlaid by whitish or pale grey quartzite in some parts suc- 
ceeded liy a mass of greenstone, and in otlicrs gradually passing upwards into 
a quartzose conglomerate with blood-red jasper-pebbles. 
Great masses of trap appear to be irregularly interposed among the strata, 
which arc also intersected by numerous fine-grained, compact, greenstone dykes. 
Tiie order of succession and the thickness of the beds are tlius given :— 
