In south Oran they determine the principal axes of the mountain ranges.
The mammals of the Mountain Region include the cotton-tail rabbit, red squirrel, lynx and woodchuck; and there is a considerable variety of migratory song-birds, which are common to the more northern states.
Lavas dip in all directions from the central crystalline core, pointing to the conclusion that the main portion of the mountain represents a single volcanic mass.
A distinct connexion between the flora of the peninsula and Ceylon and that of eastern tropical Africa is observable not only in the great similarity of many of the more truly tropical forms, and the identity of families and genera found in both regions, but in a more remarkable manner in the likeness of the mountain flora of this part of Africa to that of the peninsula, in which several species occur believed to be identical with Abyssinian forms. This connexion is further established by the absence from both areas of oaks, conifers and cycads, which, as regards the first two families, is a remarkable feature of the flora of the peninsula and Ceylon, as the mountains rise to elevations in which both of them are abundant to the north and east.
This rock was separate from the rest of the mountain and was in motion, turning slowly around and around as if upon a pivot.
Many of the fundamental ideas of Druse theology belong to a common West Asiatic stock; but the peculiar history of the Mountain is no doubt responsible for beliefs, held elsewhere by different peoples, being combined there in a single creed.
One peculiar feature of the mountain landscapes are the mines.
South-west of Ma'in, on the west of the mountain range and commanding the road from San'a to the north, lies Baraqish, anciently Yathil, which the inscriptions and Arabic geographers always mention with Main.
The precise positions of the mountain ridges that traverse this central area are not properly known; their elevation is everywhere considerable, and many points are known to exceed 10,000 or 12,000 ft.
The border of the plateau on the south-east is an abrupt escarpment, eroded where the folded structure of the mountain belt reveals a series of weaker strata; but in the north-west the plateau suffers only a gradual decrease of height and of relief, until the prairie plains are reached in central Ohio and southern Indiana and Illinois, about 150 m.