120 The American Geologist. Aut,'ii;.t, isoi 
tlic Ciiinbriaii and the Tacoiiic, i. e. bclwin-n the sutoiid and the first 
faunas. Tho Levis strata and the City of Quebec roci<s he places to- 
gether under tiie term Levis (for which, however, Mr. Ami prefers to 
retain tlie name Quebec ;, and the Sillery strata, underlying the Levis, 
he would locally designate by the term Sillery. This Sillery consists of 
two part*^, a series of shales and sandstones and a series of quartzytes 
and limestones, the latter unconformable below the former. This un- 
<'onformity within the Sillery, which is the Taconic of Emmons, cor- 
responds with a great break which has elsewhere been discovered in the 
Taconic, and apparently marks the date of outbreak of the eruptive 
facies of that period. The red shales of the upper Sillery are analogous 
to the red shales and sandstones of the Georgia of Vermont, and of the 
upper part of the Nipigon series of the Northwest, and the underly- 
ing limestone and (luartzyte seem to be on the stratigraphic level of 
the Winooski marble and Granular ciuartzof Vermont, and of the Pewa- 
bic quartzyte and "cherty limestone" of the Mesabi range in Minne- 
sota. This would make the Sillery the representative of the upper iron- 
bearing formation of the Northwest, and of the Taconic district of 
western New England. The intensity of this outbreak, and its wide 
extent, are shown in the fact that it accompanies this horizon all along 
the Appalachian chain, through New Jersey, into the Courtland region 
of New York, the Adirondacks. and thence through the Canadas to the 
regions of the Great Lakes. 
A)i Erped'iUon to Mt. St. Eliiis. Alaska. Israel C. Russell. (Nat. 
Gi^og. Mag. Vol. in, pp. .53, 204, May 29, 1891.) Eighteen plates, SI. .50, 
Washington. 
This very interesting and valuable number of the National Geographic 
Magazine, which is wholly taken up with this report, contains a very 
full description of the experiences, and the results, of the expedition of 
1890, under the auspices of the National Geographic Society, led by Mr. 
Russell. The usefulness of modern photography to geology and geog- 
raphy is beautifully illustrated in the numerous handsome plates which 
are given. The volume is a very valuable addition to the literature con- 
cerning Alaska, and adds very much to all former reports on the topog- 
raphy, geology, and especially on the glacial geology of that territory. 
OeolO{jic(tl Survey of Neiv Jersey. Annual Report for 1S90. John C. 
S.MOCK, state geologist, Trenton. 1891. pp. 305, three maps. 
This valuable re|)ort embraces a summary report by Prof. Smock, a 
brief report by E. A. Bowser on the condition of the Coast and Geodetic 
Survey in the state, a report on the geology and other features of the 
iron mines by Frank L. Nason, including a chapter on the post-Archean 
age of the white limestones of Sussex Co., and an elaborate report by 
C. C. Vermeule on tho water-supply and water-power of the state. Al- 
together the document indicates a state of healthy activity for the 
survey. 
We have noticed the high .scientific value of the report of Mr. Nason 
who has brought out some very important facts respecting the white 
limestones and iron ores of .Sussex county. Already this had been fore- 
shadowed by the article of Mr. Nason in the April No. of the American 
