262 | Scientific Intelligence. = | 
verywhere rises above the surface when the ee formation is : 
faterrag! ted. ‘There is, however, a considerable nt of it exposed, 
This ridge of oolitic rock is slightly Prete by the chalk and ter- | 
tiary beds, but it again appears in the kingdom of Valencia as far as | 
the town of the same name; so that, in fact, io oolitic formation can 
be traced from Valencia to Burgos for a distance of 180 Spanish leagues 
(900 kil.) forming an obtuse angle at the culminating-point of Mon- 
b 
ince of Serder and in the Ba asque prot inces, as is Ma id down in the 
Geological Map of France. It probably exists in other localities not 
yet ee investigated. 
e oolitic formations of Spain have in my opinion some remarkable 
features. "They 2 abound in metalliferous deposits of all kinds, See 
scattered in small isolated masses, and seldom in veins. These beds 
were formerly worked with profit when mining was carried on on 4 
small scale, and with the help of slaves. Now, however, minerals 
must be very rich and abundant to enable companies to make any 
return. Almost all those who have worked in the jurassic formation 
rate been ruined. Cuivre gris or BY. copper ore of good quality is 
worked out. r Barbadillo, a 2 ext Picts of the province of 
ore, is most promisin e non-argentiferous galena Is gene i 
more regular, and a few head veins of sulphate and oxy an- 
ince of Zarogoza. 
In several places the rocks of the oolitic group have been affected by 
volcanic eruption, by which they have been altered, their color an nd 
> 
mations at or near the point of junction with the more recent forma- 
tions. sont may mention, by way of example, the hot springs of Fitero 
~ in the province of Navarra, Arnadillo in the province of Logrono, 
Alama near Edlate ayud, There are also cold sulphureous sprindl ; 
aracuellos in Aragon, and those of Gravalos in Castille. _ 
must, hovever, be observed that these same phenomena also oce 
¢retaceous formations, although not so frequently ; amongst _— 
