There are two important manganese carbonate horizons in the Middle Ordovician and Early Sinian strata in central Hunan Province.
湘中地区有中奥陶世和早震旦世两个重要的锰碳酸盐层。
The Nantuo Formation of Early Sinian Epoch in Liantuo area, Yichang is situated in glacier frontland of western palaeo—island continent of central Hubei.
宜昌莲沱地区早震旦世南沱冰碛岩，位于鄂中古岛陆西部冰川前缘地区。
Its age is Sinian early Paleozoic to Devonian.
其时代主要为震旦纪—早古生代至泥盆纪。
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