taken 13 years ago, near to Weybourne, Norfolk, England
Crag Geology
The Cretaceous chalk is at the bottom, it contains some belemnite fossils.
The 'stone' bed is above, it is a traceable line of poorly sorted flints and pebbles along with mammal remains. The bed shows a quick marine transgression which washed away the smaller particles. Next is the Wroxham crag (pre glacial); a series of coarse cross bedded sands (in some cases) start the sequence. Next is bioturbated sand and clays that are interbedded. These show tidal areas in shallowish waters. After the energy increases near the shoreline coarse sands appear again, this can also indicate more river input. The crag shows this because there was a marine transgression event before sea level became stable. The basin here filled with sediment so the depth gradually decreased. On top of the crag is Quaternery deposits made up of glacial till.
Image classification
(about):
Supplemental image
This page has been
viewed about
116 times