Scientia Sinica

154 SCIENTIA SINICA Vol, -V

species of the two floras are: Equisetites sarramt, Neocalamites carrere1, Ginkgoites magnifolia, Podozamites lanceolatus and Swedenborgia cryptomertoides. Except the species Ginkgoites magnifolza, all other identical forms are found only in the upper part of the Yenchang Formation. From the Hsiangchi Coal Series of Szechwan, there has been found another important identical species, Cladophlebis raciborsku.

Taken as a whole, the Yenchang flora of Northern and Northwestern China is most closely related to the Middle Keuper floras of Europe and Northern America, corresponding to the Lunzer Keuper of Austria, the Basler Keuper of Switzerland and the Virginia-Keuper of North America. Palzobotanical evidence points generally to the conclusion that the fossil flora at present known from the Yenchang Formation is of the Upper Triassic age. It might indeed be classed as Keuper-Rhaetic, as Dr. P’an advocated.

- REFERENCES

[ 1] Sze, H. C., 1955. On the Botanical Character of the Yenchang Flora, Northern Shensi. Scientia Sinica, 4 (4), 599—607.

[ 2 ] Zeiller, R., 1903. Flora fossile des gites de charbon du Tonkin, Paris. Etudes des gites minéraux de la France.

[ 3] Sze, H. C., 1931. Beitrage zur Liassischen Flora von China. Mem. Nat. Res. Inst. Geol, (Academia Sinica), No. 12.

[ 4] ——————,, 1933. Beitrage zur Mesozoischen Flora von China. Paleont. Sinica, ; Ser. A, Vol. IV, Fasc. 1.

Sal) Rian, Cae 1936. Older Mesozoic Plants from North Shensi. Paleonz. Sinica, Ser. A, Vol. 4, Fasc. 2, p. 36.

S512 pps 35y 30: (Se) eed yes.

[6a] Krasser, F., 1909-1910. Zur Kenntnis der fossilen Flora der Lunzer Schichten. Jahrbuch der Kaiserlich-Kénighchen geologischen Reichsanstalt. Bd, 59, Heft I, p. 108. [ 6b |] —————, Jbid. p. 108.-

[ 7 ] Leuthardt, F., 1903. Die Keuperflora von Neueselt bei Basel. Teil. 1. Phanerogamen. 4 Abhandl, d. Schweiz. Paleont. Gesill., Bd. 30.

[ 8a] ———.,, 1904. Die Keuperflora von Neuewelt bei Basel. Teil. 2. Kryptogamen. Abhandl. d. Schweiz. Paleont, Gestil., Bd. 31.

[ 8b] ———., Ibid. p. 34; pl. 15, figs. 1, 2.

[ 8% ] ————.,, Idid, p. 32, pl. 18, figs. 1, la.

[ 8e , Ibid. pl. XVIII, figs. 2, 2a.

[ 8d] —————,, Jud. pl. XXI, figs. 1, 2. | [ 9 ] Heer, O., 1864-1865. Die Urwelt der Schweiz. Zurich.