366 
APPENDIX. 
more nearly allied to the gypsum formation of Paris than to the 
red marl to which I have referred the other specimen of gypsum, 
No. 12. 
MAGNESIAN LIMESTONE, OR DOLOMITE. 
17. Limestone, very compact, and strongly impregnated with 
magnesia, and is of a yellowish white colour; occurs spht into small 
laminated fragments, hke broken tiles. The ground is covered 
with these fragments, which break and rattle under the feet hke 
pottery. It is found in the plain between Zuela and Omesoguin, 
lat. 26°. 
18 and 19. From the plain that Hes between the Black Moun- 
tains and Pass of Kenair. Both these specimens are compact lime- 
stone, of a dark flesh colour, and contain much magnesia. This 
plain is covered with small shining fragments of this hmestone, 
particularly near El Gaaf ; and their exposed surfaces are corroded 
and furrowed over with the small irregular grooves and channels 
already mentioned in the note to No. 1. 
20. Flesh-coloured dolomite, mottled with yellow. From the 
north base of the Black Mountains. 
21. Hard compact dolomite, of an ochre yellow -colour. From 
the Well of Gutfa, between the north base of the Black Mountains 
and town of Sockna. 
22 and 23. Brecciated dolomite, of yellowish white colour, full 
of knobs and concretions of the same. Found on the plain near 
Sockna. 
24f and 25. Brecciated dolomite, of dark flesh colour, full of 
small angular concretions of the same substance, but in more com- 
pact state than that which forms the cement by which they are 
held together. These are found near the compact flesh-coloured 
dolomite, No. 18 and 19, in the plain of El Gaaf. 
AU the above specimens, from 17 to 25, are much impregnated 
