Channel morphology, bedform and sediments of the Onyx River and the nature and origin of the Labyrinth in the Wright Valley

The Onyx River geomorphology was investigated by surveying 8 cross sections to illustrate the variation in channel and bank morphology from the mouth of the Onyx through to its final entry into Lake Vanda. Special notice was taken of the terrace formations at each site. In addition, at each site the channel slope was surveyed for some 200m, and samples of fine bedload were collected for subsequent laboratory analysis. The coarse bedload was sampled in the field both in the channel and on the terraces for laboratory analysis.