208 Capt. H. Lynes & W. Campbell Smith— 
Soon after leaving Nahud tracks of blown sand are encountered. 
The hitherto imperceptible undulations contract, and trekking in 
the soft sand, with its frequent ups and downs, becomes tedious. 
The screen of bush on both sides of the track deprives the traveller 
of any view of the country to right or left, except on rare occasions, 
and then, when these glimpses of the distance are obtained, it is 
only on the horizon that any features stand out above the prairie- 
like landscape. 
On crossing the frontier into Darfur, the same character 1s main- 
tained, but with ever-increasing sand, until Jebel Hilla and the Lugud 
Hills appear, a welcome sight to the traveller, not only by reason of 
their fantastic forms and unusual colouring, but also as marking the 
beginning of the “game” country. These hills form a low range 
flanking the track on the north from Lugud to Abiad. Seen from the 
south they present a, continuous series of flat-topped hills carved 
by denudation into a variety of shapes, fantastic pillars and 
“* cathedral ”’ masses rising from or flanking the table-tops in endless 
profusion, and rendered the more remarkable by their many colours, 
garish yellows, reds, pinks, and purples predominating among 
light greys and darkest browns. They are formed of sandstones and 
clays, apparently unfossiliferous, and, as far as can be judged from 
photographs, everywhere horizontal. 
It is not practicable to publish here any of the photographs of 
these hills, but there is a striking similarity between the type of 
scenery north of Lugud and that portrayed in Col. Tilho’s photo- 
oraphs of the peaks of Dourdouro in Hrdi, 300 miles to the north- 
west, to which the reader is referred.t So striking is this similarity 
that one is tempted to hazard the suggestion that the sedimentary 
series of Erdi has its south-easterly prolongation in these hills between 
Abiad and Lugud, with an outlier or further extension to the east 
at Jebel Waled, near Nahud. 
Specimens of these rocks from Jebel Haggila, between Abiad and 
Um Gedada, are yellow friable sandstone with a little muscovite, 
pale purple fine- grained sandstone, with occasional pebbles of white 
quartz, and quartz- conglomerates with hard black limonitic cement 
(32). At Lugud there are similar sandstones, pink and red, with thin 
bands rich in hematite (33). In addition there occur some fine 
decimillimetre-grained clayey sandstones, or sandy clays (338c), 
rather powdery to the touch, pale cream to palest violet in colour, 
with irregular streaks of pale lavender tint, which are more sandy 
and coarser in grain than the hghter coloured portions. On a low 
50 ft. kopje, Jebel Hilla, 5 miles south of Lugud, these clayey 
sandstones occur near the top, and are here associated with pink, 
white, and pale-buff quartzites (35), very compact and fine-grained. 
The lower part of the hill consists of dark red friable false-bedded 
sandstone. These pale violet clayey sandstones seem to be an easily 
1 Jean Tilho, Geogr. Journ., vol. lvi, 1920, p. 93. 
