Athro, Limited Gubik Field Trip Section 20 Tuapaktushak

You are standing on the side of a small drainage eroded into the tundra, looking in the direction of the green arrow. You are part way up the cliff as shown by the blue arrow.

There is a small pod of shells eroding here from a fold in the sediments. The pod appears to have been a small lens of shelly gravel that has been rotated as the sediments were deformed so that it is now lying vertically in a limb of the fold.

Shells in Shelly Gravel Enlargement of Green Circle

This is a small lens of shell and shell fragments in a fine gravel. The shells include both bivalves and gastropods. Most of the shells are just fragments, but some are intact. You can collect fossils and a sample of the fossils for amino acid racemization from here by pressing the buttons below.

Pebbles in shelly gravel Enlargement of Blue Circle

Lots of pebbles are evident as well as the shell fragments. Most of the pebbles are black in color. This is a conglomerate. It is composed of a poorly sorted mixture of silt, sand, shell fragments, and pebbles. The matrix inbetween the pebbles and fossils is mostly sand.