Athro, Limited Gubik Field Trip Section 65 Tuapaktushak

You are standing in a gully, looking in the direction of the green arrow. You are part way up the cliff as shown by the blue arrow.

Folded sediments

There is a fold visible in the gully wall. These Pleistocene sediments are interbedded sands and mudrocks. There is also a layer of shelly gravel. There are occasional isolated fossil bivalves in the mudrocks.

Shelly gravel layer

There is a layer of shelly gravel here. It contains pebbles, and fossil shells, including snails and clams. Much of the shell material is fragmentary, and bivalves are found as isolated valves. You can collect a sample of the fossils, and a sample of fossils for amino acid geochronology by pressing the buttons below.

Soft Sediment Deformation

The beds also include clear evidence of soft sediment deformation, including flame structures. The clean yellow sands have been injected into surrounding finer grained sediments. This could have been contemporaneous with the folding.