3 
. 
' 
Cx - 
ney and: —s to that of Carrara marble ; it is 
v it could be verre im fuffici- 
and it Pils a BS cement. 
Tt includes much tale in Laci cia site —— of a 
lenticular form and of various fizes, mall to the 
fize of a hazel-nut : thefe j are almoft ale er Aifpofed with 
their flat fides downwards, and parallelly with the ftratifi- 
cation ; their colour is a very fine Sometimes the 
lamine "of the tale are in fo clofe conta& among each other, 
that a compact mafs, like that of fleatite, is produced ; 3 at 
p it vy and refemb ble 
fmall groups, which bang 
"oh eafily be miftaken for 
“. Thon m, defcribed by Mr. Von Buch, who 
obferved in in aed by in greywacke flate. 
Itis of a dlofe texture, and has a fine cryftalline grain. Its 
rata are inconfiderable, bent in various directions, and 
It affects feveral colours. M. 
to this formation the gypfum which he 
Nes between Bayonne and St. Jean-de-Luz, at the 
foot of the the Pyrenees ; ; that of Vizille, near Grenoble ; that 
of Deffifes, in the department of * Cote-d’Or ; that nf the 
Salines of sof De in Switzerland, 
Fa apn —Werner ado oa two diftin@ formations 
ee um 5 the Si rf, reiting on the firft fletz-limeftone, 
and co ake =< ta et fa ea 
d with coloure 
Arragon ae arra- 
occurs in it). at Sepia of gypfum on 
re pat of the V olga on to this Bee On 
Rs ip in which the rock. t and falt-fprings ftand 
ere uk af France, at 
ypfum, fee ee 
a? ear fletz-gypfum i is F tasteeibeted on the varie- 
ier Sabet and ipee Rh tht the fecond limeftone. It 
‘ n to occur p titic by means of i d 
mb 
racite, arragonite, age &e. like the firit 
equally abundant. It forms, however, 
xon a 
8 
8 i 
ae 
Bu 
lon, at Aix, an vars »berland and 
Chie “as to the vhs Se of Derbythire, we ‘have it ob- 
rved by Mr. Jamefon, that the formation to which it be- 
as_ the limettone. 
5 UM. 
tions of as Hea ge there are two others whofe nature is 
not fatisfaétorily afcertained, viz. the gyplum 
berg, i inthe Mark Brandenburg, and that of Neuland, near 
Léwenberg, in Silefia, To thefe may be aie the gypfum 
of the neighbourhood of Paris; but not.as a dubious one, 
for the obfervations lately made upon it by Cu vier and Brong- 
niart, with an account of which we fhall conclude this 
part of the prefent article, have proved it to belong to a 
formation very = from, and of more recent date than, 
thofe already mentioned, 
The gypfeous freation of Paris is not compofed of 
gypfum alone, but ftrata of it alternate with argillaceoys 
and calcareous marle : aa follow the fame order of fuper- 
pofition in the whole gypfeous tract, from Meaux to T ae 
and though in a few difltricts fome ftrata: a 
wanting, yet-thofe that remain chests affect the — 
i "he gypfum is placed immediately above 
The gypieous hillocks and elevations have a 
ee appearance by which-they may be ae uifhed at 
iitance, being always placed on the limeftone ; they pore 
as it were, another fet of e opgated or monica hut ways 
diftinét hills, refling on the calcareous eminences. 
Montmartre, as well as Sat hillocks that appear tobe a 
prolongation of it, exhibit three diftinct mafies of gypfum ; 
the lo gamed a is compofed of alternate and not very thick 
ftrata of gypfum Peer ceate pafling spt {parry gypfum), 
of folid calcareous and of very foliated argillaceous marles. 
It is in the former of thefe in particular that the large yel- 
low lenticular cryftals of {parry gypfum are found: the 
foliated argillaceous marle (or a t niheide flate), contains the 
variety of filex called menilite. No foffil fubtlances have as 
yet been found in the third gypfeous m mafs.—The fecond, or 
intermediate mafs, differs from the preceding only in in this, 
that the beds of gypfum are Nee: and that the ftrata of 
marle are lefs numerous. chiefly in this mafs that 
thes have been dfcovered alfo celeftine (fulphate of 
in it in kidneys towards the 
om marbled variety OF pine 
belonging to this fecond mats.—The peta, mafs od 
ypfum, which the workmen call the firft, is, in every re 
fpett, moft remarkable, and the molt important. 3 
18, befides, much thicker than the reit, having 3 in fome parts 
; it is interrupted 
only by a fall number of male firata, and, i in fome 
as at Dammartin and Montmorency, it is fituated almoft 
haga gh under ihe vegetable mould —The lowermoft 
beds of th rift contain. fists that appear to pafs 
over into, eet to epee r hoe sega 
intermediate be beds ave a te fe pete 
rifm . with fevyeral planes that oe well rte and 
gured by M. Defmareft. Laftly, the upp permoft beds 
es firft mafs are penetrated by marle 5 they have but thle 
thicknefs, and alternate with ftrata of marle. 
More particularly interefting are the obfervations that. 
have been made by the fame ingesiou 8 naturalilts on the 
y foffils contained both in this ate and in the mcrie 
that covers it. It is in ‘this frit A pain mafs that are 
To the 
wn. birds and q) uadrupe Se 
s unknown » t a8 no well educated sors has ever marle that 
any obfervations ‘This fecond a-high 
