SIJURiAN-EABJY DEVONIAN STRATIGRAPHY IN THE YANJING AREA, TIBET, AND ITS SIGNIFICANCE

The author has discovered Silurian strata yielding graptolites and conodonts and Lower Devonian strata yielding tentaculites and corals. Both display conformable or disconformable contacts and belong to platform-type sediments. So. it is considered that there was no strong Late Caledonian folding in the area.