41. Yellowish variety of the same, the granular passing into compact structure. “Thick exposed beds from Om el Abeed to Sebha.”
42. Yellowish-grey variety of the same, as perfectly compact tabular fragments, having their surfaces studded with small polymorphous bodies imitating the appearance of parts of secondary fossils. From ditto.
43. The same as the preceding, having its surface marked by small bivalve shells, converted into the mass of the sandstone. From ditto.
44. Sharp-edged fragments, of a variety like No. 39., of a deep chocolate-brown colour and flat conchoidal fracture. “Between Sebha and Timinhint; rocks about 250 feet high.”
45. The same, in which the quartz grains are very firmly cemented by dark-red or brown siliceous iron-stone, sometimes enclosing larger rounded grains and small pebbles; the whole forming a very hard compact conglomerate with conchoidal shining fractural surface. “From between Om el Abeed to Sebha, and near Zuela.”
46. Fragment of a mass of quartzy sandstone and compact brown ironstone, externally stalactic reed-like, with black glossy surface. “From the hills of Wady Ghrarby.”
47. Brown ferruginous sandstone, nearly compact, and with drused cavities, enclosing yellowish nodules of magnesian limestone. “Forms the upper part of numerous low hills, and the surface of exposed parts on the road from Hamera to Zuela.”
48. A mass of yellow and brown ferruginous sandstone with amorphous botryoidal surface, unequally penetrated by siliceous brown oxide of iron, which produces the appearance of a mixture of brown ochrey clay-ironstone. “Near Timinhint, forming the summit of hills.”
49. Wood-hornstone; dark brown, with lighter coloured centre, being part of a cylindrical stem or branch of a dicotyledonous tree. “From between Mestoota and Gatrone.”
50. Flint composed of conchoidal distinct concretions, some of them forming nuclei; the layers of alternating brown and white colours, irregularly curved. “Quantities strewed over the plain from Temasta to Bonjem.”