Microfossil of eoaphanothece from the xuanlong-type iron ore-deposit in orthwestern hebei

摘要

Eoaphanothece xuanlongensis described her is discovered in the Changchengian (Proterozoic) Xuanlong-type iron ore-deposit. It shows a colony made up of rod-like cells. The length and width of the Cells are 0.37 μm and 0.23 μm respectively. The ratio of length to width is 3.17 to 1. The age of Eoaphanothece xuanlongensis is about 1800-1757 Ma, and is 400 ma older than that of the oldest Microfossil in a same family discovered previously. So it is the odest Aphanothece discovered up till Nom.