390 ORDER OF SUPERPOSITION OF 
TABLE II. continued. 
Periods and 
Groups. 
Names of the principal Members and general Mine- 
ral nature of the Formation. 
Some of the Localities where the 
Formation occurs. 
ill. Tertiary Period, 
continued. 
E 
tu 
a 
CU 
u 
o 
CalcaireGrossier («), 
plastic clay, sands, 
sandstones, &c, with 
marine fossils (b). 
Calcaire siliceux — 
sandstones and conglo- 
merates,red marl,green 
and white marls, lime- 
stone, gypseous marls, 
— with land and fresh- 
water fossils (e). 
a. Paris basin. 
b. Paris, London, and 
Hampshire basins, Isle 
of Wight. 
c. Paris Basin, Isle of 
Wight, Auvergne, Ve- 
lay, Cautal. 
F 
1. Maestricht Beds. — Earthy white 
limestone with siliceous masses, re- 
sembling chalk (marine). 
St. Peter's Mount, Maestricht. 
2. Chalk with flints ( 
marine). 
•etaceous Group. 
«i. Chalk without hints (marine). 
R 
o 
3 
« 
a 
4. Upper green sand (marine). — 
Marly stone, and sand with green 
particles ; layers of calcareous sand- 
stone. 
\ North and South Downs, and 
' parts of the intervening Weald of 
Kent, Surrey, and Sussex. 
Isle of Wight, coasts of Hamp- 
shire and Dorsetshire, Yorkshire, 
North of Ireland. 
M 
o 
5. Gaidt (marine). — Blue clay,with 
numerous fossils, passing into calca- 
reous marl in the lower parts. 
III. Secok 
6. Lower green sand (marine). — 
Grey, yellowish, and greenish sands, 
ferruginous sands and sandstones, 
clays, cherts, and siliceous limestones. 
> 
G 
d. 
o 
0 
S 
13 
CU 
1. Weald clay (freshwater). — Clay, 
for the most part without intermix- 
ture of calcareous matter, sometimes 
including thin beds of sand and shelly 
limestone. 
1,2. 
Extensively developed in the 
2. Hastings sands (freshwater). — 
Grey, yellow, and reddish-brown 
sands, sandstones, clays, calcareous 
grits passing into limestone. 
; central parts of Kent, Surrey, and 
Sussex. 
3. Isle of Purbeck, in Dorset. , 
shire. 
3. Pnrbeck beds (freshwater). — "Va- 
rious kinds of limestones and marls. 
1 
