270 



GERMANY. 



for roads. The surface of the heaths of Liineburg is only slightly undulating, but 

 their northern edge sinks down abruptly, and, viewed from afar, resembles a range 

 of hills. The heights seen in Oldenburg are evidently ancient dunes consoli- 

 dated by the furze which has taken root upon them. Whenever the protecting 



Fig. 154. — The Peat Bogs of Coesfeld. 

 Scale 1 : 125,000. 



Turf I'Lls 



I'lal JJijys 



2 ililes. 



cover of furze is removed the wind gets hold of the sand beneath, and wafts it 

 over the fields in the vicinity. The Hiimmling, a range of heights to the east 

 of the Ems, is likewise an old chain of dunes. 



Long after the plains of Northern Germany emerged from the sea, consider- 



