stone of Paris, and sub-Apennine mountai 
M. Alex. Brongniart sur les caracteres Zoologiques, &c. 217 
from Grodno and Keminiac—white chalk, full of flints and 
echinites from the castle of Cracow; in the neighbour- 
hood are found shells similar to those of be auae 
4. Green Sand or Glauconie crayeuse (a a chloriteé) de 
La Perte du Rhone, near Bellegarde. There are here tw a 
very distinct formations. 1. The inferior, a fine, grey, yel- s 
Owish, compact limestone, in regular, nearly horizontal 
strata, ‘without any visible ‘petrilactions, It however con- 
tains between its stat as in Jura, b Fds.0 marl very differ- 
ent from the superior to be described, and — 
abounding in_ shell logous to those in the 
marl beds of Jura; g are also to shells in the 
marl beds near Havre. ‘ rior, a yellowish lime- 
stone often shaded it yellowish ochry veins, stratifica~ 
tion distinct, pee horizontal, with a slight dip S. E.; it 
seems to ae made up of an immense mass of lenticular 
stones, which are aeand to be little madrepores, (orbitolites 
lenticulata; Lam.) Above are alternate strata of marly lime- 
stone, and a sandy clay mixed with green grains, (green 
sand, upper formation abounds in shells strikingly 
analogous to those of the green sand formation, particularly 
from Ke saree and St. Catherine. The genera are the 
; the species, some identical, and others distinguisha- 
ble o oly when laid side by side. There are no shells of 
e ancient or more recent rmetion than that of chalk. 
ides the analogy of fossils, this upper formation contains 
the green sand of the Glauconie, and rests upon a bed of 
aie = marl like the Glauconte at Honfleur and Tesworth, 
The lenticular rock is so ferruginous as to be called 
an rol n ore by Saussure; it is analogous to the ferruginous 
sand found below the green sand in “England and Norman- 
“be esination of the chalk ond. j in the chain of 
Testing on rocks of the transition period. T 1a 
ceeds from the summit of Buet, i in the Alps a 
of dark coloured summits, nearly pe ie: So 
one face, and sloping on the other, and very fty ; 
8000 feet above the level of the sea.) 
On the top of one of these summits, (in pee) that 
of Fis in the valley of Servoz, is a rock which fs 
‘o the chalk formation. The = strata of the mountain, ; 
Vou. VIII.—No. 2 . 
{about 
