
Click for pictures
A bright sunny day plus the infectious enthusiasm of our
leaders set the scene for the whole of our day. We started out on to Beltinge
Beach and due to numbers split into three groups.
There was plenty to see and I felt sorry for the general
public using the beach as they had little idea of what wonders surrounded them.
Our first clues were the shingle beach itself, a veritable mixed bag of
different deposits. Newcomers, like myself, were introduced to the
technicalities of grain size, rounding and "chatter" marks etc.,and
how it all related to events long ago (geologically speaking of course).
We could see for ourselves how the coastline was receeding,
the evidence including the fact that the remains of a Roman Fort, which was once
far inland, was now at the cliff edge at Reculver.
Modern man is trying to prevent further erosin by various
means. A curved concrete promenade wall has been built along the beach, plus
large blocks of imported stone dumped at the top of the beach. These stone
blocks gave us further opportunity to try out our skills in typing and dating
rocks. Reduction of the angle of the cliffs and drainage were also needed to
delay erosion. This is particularly necessary here due to the presence of London
clay. We were also told that, tectonically, the area is sinking.
Our leaders encouraged us to take a closer look at the cliffs
and their structure. Features such as London clay, parallel bedding and the
Upnor formation were pointed out.
We were lucky enough to finish the morning session back on
the beach, with the tide out, to look for fossils. This was a very new
revelation to me. Preserved burrows of long gone sea creatures were pointed out,
and shells, which I would have dismissed as just sea shells were in fact
incredibly delicate fossils. I believe we all came away with a sample.
As we made our way to Reculver for lunch and our afternoon
session I reflected on the fact that I had climbed up and down the cliffs and
seen things I had never noticed before. My whole outlook on beaches and cliffs
will never be the same again. I shall be looking for that something extra, and I
will want to know what that rock is and how those pebbles reached the beach.
Truely an amazing day, and a big thank you to the organisers.
Frances Gregory
Following an interesting morning at Beltinge we moved further
along the coast to Reculver. It was a bright, sunny afternoon - most unusual as
far as field trips go or so I am led to believe, as this was my initiation.
After a pit stop at the King Ethelbert Inn we set about examining the imported
rocks that make up the sea defences and looked for evidence of what they were.
Thanks to Diana I now know what the twinkle factor is!
We then went on to look at the rebuilt Roman Fort and discuss
the building materials used within it. The general consensus was that it is a
real mish mash of rock types with no one predominant type. However, they are
mainly local rocks. Among those which we identified were:

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Thirty-five people and a dog gathered at Millmead in the
centre of Guildford for this seven mile geowalk. We would explore the influence
of geology on topography, land use; building stones, as well as attractive
countryside with some interesting local history.
The Hogs Back is a prominent Chalk ridge on the North
Downs between Guildford and Farnham, forming part of the northern limb of the
Weald anticline. The strata here were deposited under marine conditions during
the Cretaceous Period. They young, and, therefore, dip, steeply northwards.
Guildford is situated in the gap, cut by the River Wey, through the Chalk and
Lower Greensand.
Beginning the walk along the river, Paul Hetherington and
Janet Philips talked about the important transport links provided by rivers and
canals before the coming of the railways. For example, building stones from the
Weald, could be shipped down the Wey Navigation, linking Guildford to the Thames
and London. Janet Philips, a representative of the Wey and Arun Canal Trust,
talked about the link between London and the south coast, via the rivers Wey and
Arun. Both rise in the Weald but flow in opposite directions.
Snaking along the towpath, we looked at building stones in a
wall I had walked past many times. I now know that it is built from the Bargate
Beds, a calcareous sandstone with poorly sorted grains of very variable size.
I had always been curious about St. Catherines Hill where
some orange coloured sand slopes steeply down to the river. This comes from an
outcrop of sandstone further up the hill: the Folkestone Beds, part of the Lower
Greensand formation. The orange colour is produced by iron oxide, derived from
chemical weathering of the glauconite.
Leaving the river, we began walking westwards along the Lower
Greensand ridge towards Compton, noting differences in land use. The Folkestone
Beds, produce acidic soils which are unsuitable for arable farming. Therefore,
this land tended to be covered by woodland. The Gault Clay is now cultivated
but, being a very heavy clay, it could not be farmed or drained until the
invention of the steam plough in the mid nineteenth century.
Particularly before the coming of water and rail transport, a
local source of building stone was essential. Just outside village of Littleton
was a small quarry of Bargate Beds, commonly used in buildings in Guildford and
London, including St.Pauls cathedral. It only occurs in this part of the
Weald as thin outcrops in the Lower Greensand. Carstone is also widely used. We
saw this regularly today, including in the form of cross-bedding in the
Folkestone Beds. It is a very hard iron-sandstone. The harder Chalk beds have
been quarried for more decorative use in buildings, as clunch.
As the footpath entered the grounds of Loseley house, we
moved from the Hythe Beds onto the impermeable Atherfield Clay where there was a
lake and some mud. This is the oldest marine deposit in the Weald, laid down
when the sea poured in via the Bedfordshire Straits in the north west.
Had lunch in the pretty village of Compton, taking particular
interest in the building stones at St. Nicolas church. This dates from Saxon
times and has the oldest carved timber in the British Isles. Inside was a font,
allegedly made out of carstone (probably not) and walls decorated with clunch.
I hadnt realised that Compton also has a memorial chapel,
built in 1898, on the hill above the cemetery. This was designed by the potter
Mary Watts, the wife of Frederick Watts, the local artist from whom the Watts
Gallery, in the village, takes its name. Seventy-three villagers helped build
it. People have had mixed feelings about its Art Nouveaux style: the intricate
carvings in the red brick outside and the colourfully painted Celtic designs on
the walls and roof inside; but we considered it one of the highlights of the
walk.
The geese in the farm kept their distance as we left Compton;
heading into the woodland on the Folkestone Beds; before reaching the high
ground of the chalk ridge. Chalk, a fine-grained limestone, is the youngest of
the Cretaceous formations in the Weald. There are Lower, Middle and Upper
layers, the Chalk becomes progressively purer with less and less clay content.
. The Upper layer also contains chert (flint). We tried to
discern these changes as we climbed up the hill but were distracted by the heavy
showers which had held off until now.
Fortunately, the heaviest rain had stopped by the time we
reached the clearing in the trees at the top of the ridge. Here, there was a
good view south over the Weald. We recognised some local landmarks and tried to
visualise the underlying geology.
Ending the walk on the hill overlooking Guildford and the
Tertiary sediments of the London Basin to the north, we thanked Brian for
leading a highly informative and fascinating walk.
Joan Lee
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