Permo-Triassic rocks of Nottingham

The city is blessed with many fine exposures of what
for many years has been known as the Nottingham
Castle Sandstone, but, following a very recent review
of the Sherwood Sandstone Group by BGS, will
now be known as the Chester Formation. Some 22
members of the Society survived the road closures due
to the tram works and the Robin Hood Marathon to
meet at Clifton.
The Sherwood Sandstone Group has long been
subdivided into three main units with different names
for different regions or basins. As we can now correlate
the units across the country with the aid of geophysical
logs. the stratigraphy has been simplified with one
name for each of the three subdivisions. A number of
names have been abandoned, such as the Nottingham
Castle Sandstone and Bromsgrove Sandstone, while
other well-established names have become members,
such as the Wildmoor Sandstone and St Bees Sandstone
Members. The main aim of this rationalisation is to
simplify the seamless geological map of Britain and to
make the construction of 3D geological models much
easier. The Mercia Mudstone Group has also recently
been reviewed and its stratigraphy simplified.