FORMATION OF NORTHERN GERMANY. 133 
in the neighbouring sand-pit and close to Langelsheim. We find 
here beneath the gray chalk-marl (plener)— 
Feet. 
1. Streaked marl (flammen-mergel), with Avicula gry- 
pheoides and Pecten laminosus; becoming in the 
lowest part gradually more ser ibk and containing 
siliceous concretions . . . - 100 
2. Clay-marl, traversed by numerous baiids . hydra 
ted oxide ofiron . . . 3 
3. Soft (milde), sandy green — aie numerous sieiaeall 
granules of blackish-green silicate of iron, con- 
taining gray nodules of limestone from 1 to 2 inches 
in diameter . . 2 
This last stone perfectly eaeremnaeds to ‘that ef the i eclaning 
and of Oberau, and is therefore older than the greensand. 
This formation also occurs, in a very peculiar form, to the right 
of the entrance into the vale of Plauen, near Dresden ; where 
it forms a bed of conglomerate from 1 to 2 feet in thickness, 
which rests upon sienite, and probably fills the fissures in that 
rock. It is a siliceous chalky mass, bearing some resemblance 
to hornstone, and includes rounded fragments of sienite ; and it 
contains Spherulites ellipticus, Pecten equicostatus, Terebratula 
ovoides, &c.? 
Avicula grypheoides appears to belong only to the (flammen- 
mergel) streaked marls; in which, on the other hand, we have 
never found Terebratula biplicata, which occurs in all the older 
chalk formations. 
These streaked marls (flammen-mergel) and the greensand 
might be separated from one another with as much reason as these 
two from the chalk-marl, and as the upper from the lower chalk ; 
but we shall leave this innovation to others. 
V. Tue Gautt:—Gault, Folkstone marl, blue chalk-marl. 
[Der Galt.] 
In England the name Golt, or Gault, is applied to a deposit, 
from 4 to 150 feet in thickness, consisting of a compact clay, 
from a light gray to a dark blue colour; which contains about 
30 per cent. of carbonate of lime, and frequently includes nume- 
rous laminz of mica, and small crystals of gypsum. The upper 
portion is generally somewhat sandy, and mixed with granules 
of green silicate of iron. Spherical or cylindrical masses of iron 
