134 ROMER’S DESCRIPTION OF THE CHALK 
pyrites frequently occur in it; sometimes also in the interior 
(brown coloured nodules), which contain 57 per cent. phosphate 
and much carbonate of lime, and have been supposed to be co- 
prolites. The fossils appear to belong principally to the lower 
division, the more pure and plastic clay; in which the following 
are especially frequent :— 
Ammonites splendens. Hamites attenuatus. 
lautus. -.. tenuis. 
ae biplicatus. ...  rotundus. 
ie auritus. +++ compressus. 
tuberculatus. : maximus. 
denarius. Relea attenuatus. 
Siehe subcristatus. se Listeri. 
Inoceramus sulcatus, Dentalium striatum. 
és concentricus. als ellipticum. 
Rostellaria carinata. ate decussatum. 
This formation has been hitherto unknown in Germany, and 
we have only been able to discover some slight traces of it at 
Goslar and Sarstedt. In a sand-pit near the first-mentioned 
town, and at the neighbouring village of Langelsheim, the green- 
sand is succeeded by 
Feet. Inch. 
1. Blnish-black‘schistose clay... .. .. 5 © (« 0) ORG 
2. Yellowish-gray schistose argillaceous marl. . 1 6 
3. A more compact yellowish-gray and reddish 
Marlies os sas oe 6 a 
4..Yellowizh ‘soft clay.» ys 2/h8) eos er 
5. Friable yellowish coarse-grained suadeteans - ay He 
G./ Lower greensand... vs, o\liep ie hesu ie! ei eee 
There appear to be no fossils here in these argillaceous strata ; 
their mineralogical character and their stratigraphical relations 
might however admit of their being regarded as gault. 
Close to Sarstedt, at the southern foot of Hulfersberg, a yel- 
lowish-gray, soft schistose marl was exposed to view during the 
last year, by the construction of a road beneath the banded marl. 
It is about 20 feet thick,alternates with some harder layers of marl, 
and contains in some places calcareous concretions of sever | 
inches in diameter; we found the specimen of Hamites compres- 
sus, represented in our Plate, in this argillaceous deposit, which 
we therefore consider as gault. 
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