32 Foreign Notices in Mineralogy, &e. 
are of the same description with those so agtrenicone distri- 
buted i in our coal fields. 
3. Geological notices in Northern Aaa Jrom the Quar- 
fenly Review, No. 
“« A narrative of travels in Northern Africa in the years 
1818-19 and 20, &c. &c. by Captain G. F. Lyon, R. N. 
ae ee Rd the late Mr. itchie. Ato. pp- 382. an 
on, 1 
“From specimens of rock collected by Captain Lyon in 
various parts of his journey, Professor Buckland has been 
able to determine the geological structure of Tripoli and 
Fezzan ; all of which may be referred to the three forma- 
tions, 1. Basalt; 2. Tertiary limestone of about the same 
age with the calcaire gronsiet of Paris ; 3. New red sand 
ne, or k on Ri as we have al- 
mm; their direction is 
o) 
of: avd they 
Heretik having _ them Saeity two hundred miles to 
the south-eastward of Lyon, where they take the name of the 
Black Harutsch. Some basalt also appears in the Gharian 
mountains ; but this ridge, which runs probably to the bor- 
ders of Egypt, is composed apparently of trap and caleare- 
ous rocks—the tertiary limestone above mentioned. The 
rocks conjain marine shells, particularly two species of car- 
dium, in a state of delicate preservation. Indeed most of 
the Hiiestons formation, in every part of Northern Africa, 
appears to be loaded with fragments of organic remains, the 
most distinet of which, brought away by Captain = hana may 
be referred to the genera ortrea and pecten. We are in- 
tiga by Horneman, that the ruins of the temple of Si- 
h are limestone, containing petrifactions of shells and 
mall marine animals ; and from this place, westerly, the 
face of the rocky chain rising abruptly from the sandy des- 
ert was so crowded and filled with marine animals and shells 
and white detached mounds, as it were wholly composed of 
shells, that when taken in connexion with the ‘sea sand,’ 
which covers the desert, this vast tract of country, he con- 
a _ must have been flooded ata nee “sarcecten’ the 
