270 
EXPLANATION OF THE PLATES. 
M. Supposed continuation of the cave A. to the antediluvian 
surface N. 
NT. Supposed surface of limestone as it existed before the ex¬ 
cavation of the valley L. 
o. o. Large block of limestone laid irregularly in the chamber B., 
and apparently fallen from the roof. 
Plate XVI. 
Section of the cave of Biel’s Hohle, nearly opposite that of Bauman s 
Hohle, and on the right side of the gorge of the Bode. 
A. Small hole of entrance in the side of the cliff, by which we 
descend into the suite of irregular chambers that compose this cave. 
B. Bottom of numerous hollows or basins that occur along the 
course of the cave, and are uniformly covered with a deep bed of 
mud and sand, over which is spread a crust of stalagmite. 
C. Tubular cavities and fissures that ascend from various parts 
of the cave towards the surface, and by which the mud and sand were 
probably drifted in. 
D. Irregular rocky masses that form large pinnacles between 
the basins B., and have cavities on their summits filled also with a 
deep sediment of mud and sand, the surface of which is sealed over 
with a crust of stalagmite, H. 
E. Gorge or narrow valley of the Bode river, flanked on both 
sides by precipitous crags of transition limestone. 
F. Supposed continuation of the mouth A. to the surface, as it 
probably existed before the excavation of the valley. 
G. Supposed surface of the limestone before the formation of the 
subjacent valley. 
H. Crust of stalagmite covering the diluvial mud and sand both 
in the hollows B., and on the pinnacles D. 
