Table 1: The rock formations and their karst development in the Jinping area
Group |
Rocks |
Karst development |
UPPER TRIASSIC (T3) |
Sandstone, slate, siltstone |
No karst |
Baishan (T2b) |
Marble, interbedded with crystalline limestone. |
Pure and continuous *) |
Yantang (T2y) |
Pure and impure marble and limestone, occasionally with schist layers |
Alternation of pure and impure marble/ limestone beds |
Zagumao (T2z) |
Marble, occasionally interbedded with green schist lenses, thinly bedded slate, and mica schist |
Pure and continuous *) |
LOWER TRIASSIC (T1) |
Schist, meta-sandstone mudstone, marble, partly interbedded with schist. |
Impure carbonate beds occur between other beds |
*) pure and continuous = pure carbonate rocks occur continuously throughout the whole group