Karoo are exposed. These are locally known as the Cango Group, but are probably continuous with the Malmesbury Group that forms the base of Table Mountain on the Cape Peninsula, and similar outcrops in the Western Cape. In the Little Karoo, the outcrop is composed of limestone, into which an underground stream has carved the impressively extensive Cango Caves. The Great Karoo and Little Karoo lie almost entirely within two of South Africa’s eight botanical biomes, namely the Succulent Karoo biome and the Nama Karoo biome, both of which, like the Karoo Geological System, are more extensive than the geographical or
Karoo as "Karoo". However, it has a major extension inland into the Tankwa Karoo and Moordenaarskaroo regions of the Lower Karoo, and adjoining Upper Karoo region of the geographic Great Karoo. It also occurs to the south, in part of the Breede River Valley, as the Robertson Karoo. From here, it continues eastwards into the western half of the Little Karoo. The Succulent Karoo biome is dominated by dwarf, leafy-succulent shrubs, and annuals, predominantly Asteraceae, popularly known as Namaqualand daisies, which put on spectacular flower displays covering vast stretches of the landscape in the southern spring-time (August–September) after good rains in