SECONDARY ON THE SIGNIFICANCE OF MIDDLE-UPPER DEVONIAN STROMATOLITES AND RELATED SEDIMENTARY ENVIRONMENT

Several stromatolites with different shapes in the lew member of fianziling Formation of Upper Devonian in Fankou Mine have been discovered by the author in recent years. These fossils are of special significance for determining the sedimentary environment. This paper discuses the relationship between the shapes of the stromatolites and the sedimentary environment such as the direction, frequence and range of transgression and the feature of the basin. The stromatolites seen in this area are mostly of Palaeozoic benthons reef-building calcium algae and interstifial cohesion action. The cyclopean of them had formed on environment favorable for mineralization and reef-building. At last the author describes the distribution of stromatolites with different shapes and the evolution of the biota which are similar to the feature of barrier reef of the period in Canning West Australia.