Mineralogy and Geology. 263 
The Cretaceous formation covers the whole southern slope of the 
f i estward into the Basque 
southern slope also extends towards the west through Navarre, a por- 
e mou 
; : g 
to Oviedo in the Asturias is a distance of more than seven geographical 
egrees, 
i Phe Spanish cretaceous zone stretches towards the south with very 
ie interruption, passing near Burgos, through Old Castille, the prov- 
ne ri . ; : 
* 
€ cretaceous formations of central Spain also afford some phe- 
nomena Which deserve the attention of the geologist. ‘The most re- 
Without losing their original horizontality, as the famous plain 
u of Baraona, celebrated in the annals of Spanish fairies 
or Witches), between Medinaceli and Almazan in Old Castille. 
. of inclined beds of th 
at h nevertheless are not so elevated as the plateau itself. t Tam- 
hha In the province of Guadalajara, on the other hand, the horizon- 
no lower than the inclined beds. The same phenomenon, 
Sich larger scale, occurs in the valley of the Borunda, province 
. 
