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LATE ORDOVICIAN REEFS OF THE BEIGUOSHAN FORMATION IN THE SOUTHWESTERN MARGIN OF THE ORDOS BASIN,NORTHWEST CHINA
Author(s): 
Pages: 152-161
Year: Issue:  2
Journal: Acta Micropalaeontologica Sinica

Keyword:  stromatoporoidreefBeiguoshan FormationLate OrdovicianOrdos BasinLongxianShaanxi ProvinceNorthwest China;
Abstract: The Late Ordovician Beiguoshan Formation organic reefs in Lijiapo,Longxian,Shaanxi,are typical platform margin reefs in the southwestern margin of the Ordos basin,Shaanxi Province,Northwest China,and are composed of stromatoporoid reef rocks,tabulate coral reef rocks,calcareous algae reef rocks.Stromatoporoids played the most important role in reef-development.The stromatoporoids include Ecclimadictyon,Clathrodictyon,Tuvaechis,Rosenellaand Labechiella.The corals are Tetradium,Hemiagetolitella,Plasmoporella,Eofletcheria,Catenipora and Reuschia.The calcareous algae comprise Vermiporella and Solenopora.The early stage of reef development is characterized by the laminated stromatoporoids wrapping debris,singular corals,tabulate sponges and massive calcareous algae.In the middle and late stage,massive and spherical stromatoporoids and large massive tabulate corals formed the reef framework.Reef-dwelling organisms include trilobites,brachiopods,ostracods,large echinoderms and fasiculate cyanobacteria,and are abundant through the reef development.Comparison of the composition of reef organisms and types of reef rocks in the Lijiapo reefs with those of the marginal reefs of the Tazhong platform of the Tarim Basin and of the Yangtze platform reveals great similarities,even in their development ages.
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