Geology of England and Wales,” §c 217 
* The Green Sand consists of loose sand and sandstone;” 
the cement to the latter being calcareous. It contains par- 
ticles of a green substance, probably green earth:* and hence 
itsname. Subordinate beds and masses of chert and lime- 
stone, with veins of oe fuller’s earth, sulphate of 
iytes, quartz, &c., occur in it, with numerous petrifac- 
tions. Among these are an alcyonia, some unknown 
genera, and various testacea: a single quarry furnishing 
150 species. 
eald 
remains have never been described. 
Tron sand “is composed of a series of strata, in in which 
sand and sandstone prevail, occasionally alternating with 
subordinate beds of clay, loam, marle, faller's earth, and 
ochre.” These strata coniain brown oxide of iron, in con- 
siderable proportion, so as sometimes to be wrought as an 
ore. “Phe texture of the sandstones is evidently mechan- 
ieal, and they often, indeed, form coarse grained conglome- 
rates,” Ferns, charred sii and even a kind of cannel 
coal, occur in these sandstones. Their organic remains 
have yet received but little attention: but they are probably 
3 ly dispersed. 
Webees nd means of determining ee any members 
of this series of rocks exist in this cow 
te series.—This is an iinportant series in an econom- 
ical view, as it furnishes the best architectural materials in 
England. It consists “of a ee of oolitic limestones, of 
ealcareo-siliceous sands and sandstones, and of argillaceous 
and argillo-caleareous beds, ernting together, and — 
rally repeated in the same order; }. formation 
‘ates of many beds of oolitic lsoetiae resting upon wal 
of omg a sand, and that again upon ap an argillo- 
mation.” The whole series is divided into 
the Ripper, Middle, a Lower Oolitic System 5 and these 
are subdivided. : 
*This has been ascertained hal Barthser fe to be bab a tol IPOD, 
wenn ae sony Liao Nog ie Limestone, at the Perte 
du Rhone See Brongniart sur ee erate. — 
Vol. VII. No. 2 
and not an 
t France, 
