RELATIONSHIPS BETWEEN PETROGRAPHIC VARIATIONS AND FOSSIL PRESERVATION OF THE LATE EDIACARAN GAOJIASHAN BIOTA IN THE HUJIABA AREA,NINGQIANG,SHAANXI
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Abstract:
The Gaojiashan biota of Ningqiang County,Shaanxi Province,is Late Ediacaran in age and typically yields Nama-type fossils.Early diagenetic pyritization played a pivotal role in fossil preservation.The correlation between fossil preservation and petrographic variations,however,remains poorly understood.Detailed field observations and laboratory petrographic analysis resulted in a series of interpretations for the lateral variations of sedimentary environment and differentiation of taphofacies.Two fossil outcrop belts have been identified in the field.Our work suggests that the Hujiaba outcrop belt is of more distal origin which resulted from storm sedimentation,and thus has a higher preservation potential for Gaojiashan fossils.While the Gaojiashan outcrop belt is of more proximal origin and hence less favorable for the exceptional preservation of Gaojiashan fossils.
