Page:South African Geology - Schwarz - 1912.djvu/210

immense thickness of Karroo Beds, which, remembering the thinness of the system in the Transvaal, indicates that here an entirely separated body of water was receiving sediments.

Approximate
Thickness in Feet.

6.

Uppermost division of pebbly sandstones, found only in Portuguese territory near Sinjal …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …

200

5.

Lava Series with interbedded sandstones …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …

5,000

4.

Upper Sandstone Series—massive sandstones or grits, often pebbly, with fossil wood …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …

10,000

3.

Shale Series—sandstones, black and grey shales and mudstones, with thin seams of coal and ironstone. Glossopteris, Schizoneura …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …

4,000

2.

Lower Sandstone Series, similar to the Upper Sand­stone Series, but more conspicuously current-bedded …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …

6,000

1.

Boulder-bed Series—boulder beds, black carbon­aceous shales with streaks of coal …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …          …

450

In the north of the lake the Karroo Beds consist of blue and grey shales resting on the tilted Old Red Sandstones of the Mafingi Series; these are the Drummond Beds, and contain scales of ganoid fish.