INTRODUCTIONA preliminary investigation of the early Palaeozoic stratigraphy of W Hunan was first carried out by Wang and Liu[1] who mapped a large part of the Anhua district in 1936. During our trip in the same district and -its neighbourhood, hunting for scheelite in the Middle Tzekiang valley, from April to June, 1948, we had an opportunity to study the pre-Devonian strata en route on meandering from one antimony mine to another. We, thus, encountered the unusual Sinian "marine tillite" under discussion and discovered the strata rich in Silurian fossils. Part of our time was devoted to the study of stratigraphic succession of the Panchi Series which is the oldest formation exposed.