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 Sediments at the base of Skull Cliff 
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You are on the beach, looking in the direction of the green arrow. You are near the base of the cliff as shown by the blue arrow.

The rocks exposed at the base of the cliff are sandstones that with some interbedded finer grained sediments. Lots of features here suggest the environment in which these sediments were deposited. These rocks are Cretaceous in age, substantialy older than the immediately overlying Neogene sequence.

Bedding in K sandstone Irregular bedding in a sandstone. Ripple marks in K sandstone Ripple marks in a lens of sandstone. Plants in K sediments These look like plant fossils. Plants? Coal stringer in K sediments This is a thin stringer of coal. Coal Formation

All of these are evidences for environment at the time of the deposition of these rocks. Coal suggests non-marine boggy environments. Accumulations of fossilised logs at the base of a lensoidal sand body suggest floods in a stream.

jbg sect 20 beach jbg section 65 beach chukchi sea up gully at jbg65 up gully at jbg 20 tuap and karmuk at jbg 65 karmuk at jbg 20 Cretaceous Nualvik tuap karmuk fines peat

Sources: See beginning of trip.
Part of the Athro, Limited web site.
Copyright © 1998, 2000 Athro, Limited. All Rights Reserved.
Written by Paul J. Morris
Maintained by Athro Limited
Date Created: 10 Apr 1998
Last Updated: 17 Jan 2000