Fuping region on the southern margin of the Ordos Basin was a distinct carbonate depositional slope in the Middle Ordovician. The characters are:1. It contains carbonate gravitational flow deposition which is the special of slope zone:2. The typical structures of slope deposition

such as rollover structure

truncated structure

rub-fold structure and slide-fold structure

well developed; 3. Though palaeoslope fossils are not rich enough In the present area

deep-water ichnofossils and microfossils developed well. 4. Trace elements as V.Ni.Sr. and Ba.show high content in the rocks; 5. The trend of the slope ranges from 128-177?

ichnofacies belong to Zoophycus and Nereites.This indicates that the water depth of the slope varied from 200 to 2000m

the average rate of sedimentation might be 318mm/1000 yrs.