466 Notices of Memoirs—Gosselet’s Geology of N. of France. 
The bronzite, or rather augite, also agrees very well with that 
which forms the insoluble portion of the meteorite of Ensisheim. 
What was supposed to be alumina was further examined, and was 
found to be almost entirely chromium oxide, doubtless present in 
combination with some iron protoxide, alumina, and magnesia as 
chromite. And it appears not improbable that this part of the 
meteorite contains some tridymite, a few per cent., in fact. 
JTV.—Proressor GOSSELET.—GEOLOGICAL SKETCH oF THE NorTH 
or FranceE.—EsquissE GEoLoGiquE pu Norp DE LA FRANCE. 
3° Fascicule, Terrains Tertiaires. Texte et Planches par Prof. 
M. J. Gosselet. (Lille, 1883.) 
TITH this Fasciculus the Tertiary series is commenced, and 
comprises descriptions of the Hocene, Oligocene and Néogéne 
strata of the North of France and adjacent districts. After noticing 
the period of emersion between the deposition of the Chalk and that 
of the Tertiary strata, and the deposits referable to that age, the 
author describes the Lower Eocene, which comprehends the Montien, 
Landenien, Yprésien ; these are principally marine, with the exception 
of an estuarine fauna, which often intercalates the last two mentioned 
and may be contemporaneous with one or the other, and some very 
localized lacustrine beds containing Physa. The subdivisions and 
the variation in the lithological and fossil characters of the different 
localities are successively given. ‘The succeeding Parisien, of which 
the beds at Cassel and Brussels represent the two principal types, is 
divided into five zones, characterized by (1) Rostellaria ampla; (2) 
Nummulites levigata; (3) Ditrupa strangulata; (4) Num. variolaria; 
(5) Pecten corneus ; their equivalents in other parts of France, in 
Belgium and England are pointed out. The Oligocene comprises 
the Tongrien and Rupelien, which are also divided into zones charac- 
terized by certain fossils. The Néogéne is divided into Messinien 
(= Bolderien and Anversien of the Belgian geologists), Plaisancien 
(=Diestien) and Astien (=Scaldisien), their lithological, and fossil 
facies, and distribution being fully noticed. 
Besides numerous references to previous works relating to the 
different geological divisions treated of in this part, there are five © 
plates of Tertiary fossils, many sections, an orographic map at the 
beginning of the Tertiary period, and also four maps indicating the 
continental, estuarine and oceanic areas during the Landenien, 
Yprésien, Parisien and Diestien epochs. To the student of British 
Eocene and Oligocene strata, this contribution of Prof. Gosselet on 
the homotaxial (if not synchronous) deposits of the North of France 
will be highly instructive and useful, as representing the physical 
features, and associated faunas of that part of the area at the Lower 
Tertiary period. 
The fourth and last fasciculus will appear in 1884, and will con- 
tain descriptions of the recent and diluvial strata, the physical 
movements since the secondary period, and the orography and 
geography of the region as deduced from its geological constitution. 
J. M. 
