Meizilin Fm

The type section of the formation is Meizilin section, situated near Meizilin Village, about 6 km north of the Lelai Town (110°24’30” E, 18°55’57” N). The Meizilin Formation was firstly published by Zhang & Jiang (1998), and was described in more detail by Yao et al. (1999). It was originally appeared firstly in a 1991 manuscript Ma Guogang and others from t Yichang Institute of Geology and Mineral Resource, Chinese Academy of Geological Sciences. The name is derived from Meizilin village, Lelai Township, Wanning City, southern Hainan Province.

Synonym: （美子林组）

The Meizilin Formation is an epi-metamorphic clastic and carbonate sequence. The formation is roughly divided into three parts; Lower part consists of arkose-sandstone sandstone, siltstone, and sandy mudstone; Middle part consists of dark grey, thin to thick-bedded biotite-diopside quartzic hornstone ("hornstone" = rich in chert nodules?), biotite quartzic hornstone, and diopside quartzic hornstone; Upper part consists of limestone, muddy limestone, sandy limestone, diopside-tremolite marble, wollastonite marble. In the type section, the formation is incomplete as its basal part and base and upper part and top are unknown. The exposed portion is over 415.2 m thick.

Shall shelly fossils Cambrothyra sp., Calcichexactina sp., Hyolithelus sp., Lapworthella sp., and Siphogonuchites triangulates Qian are known from the top of the third par of the formation.