(b) the portion between Paiyenching and Makai, which is taken

from Credner's traverse. (c) some of the occurrences of Upper Red Beds between

Houching and Lufêng Hsien, which are added from the

results of Credner's and Saurin's observations. The group described as “Devonian to Permian”, consists mainly of Permian limestones and basic rocks to the east of Tali Fu; elsewhere it includes Gregory's Minchia Series of Devonian age. The “ Transition Systems” belong chiefly to the Pre-Palæozoic Kaoliang slates and phyllites, but in the east may include Cambrian rocks. The “ Archæan” comprises the gneisses, schists and crystalline limestones of the T'sang Shan complex, west of Tali Fu. The topography of this map is taken from that of General H. R. Davies, published by the War Office in 1906.

On the smaller map (Pl. 29), the outline of the Red Basin of Szechuan is reduced from that published by C. Y. Lee on a scale of 1: 14,000,000 in 1934, and it includes not only the Cretaceous rocks of the centre, but also the Triassic and Jurassic formations of its outer rim.

The line indicating the approximate western limit of the Gigantopteris flora, as it is known to-day, is drawn to include the occurrences of this flora which have been described from Szechuan, Yunnan and the Upper and Middle Laos. It is interesting to note that its prolongation in the same direction to the south would include the known occurrence of this flora in South Eastern Sumatra.

It has been found impossible to mark the position of every locality mentioned in the paper on the maps, owing to their small scale, but in the few cases where this has not been done sufficient indication of their position has been added in the text.

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