Gallery

Photographs from-

More Hertfordshire Churches‘ a walk with Mike Howgate, Friday 6th October.

Four Churches to be exact, a large octagonal dovecote, the Walkern Art Gallery, the Brewery Tea Rooms for lunch and a historical Motte and Bailey site in Pirton from 1139 AD.

All photos R.F.
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Mike and group entering ‘St.Michael and all Angels’ at Waterford.
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Some magnificent stained glass, this one by Karl Parsons 1929.
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……and another by William Morris.
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A plaque with ‘Memento Mori’ or ‘remember you will die’ symbols.  A skull; wilted flowers; hour glass with time running out; the ‘thread of life’ with some threatening shears and others.  Mike explained the meaning behind these morbid but fascinating Victorian images.  ‘St. Mary & St. Thomas Church’.
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Another plaque with ‘Memento Mori’ relating to a local family.  St. Mary & St. Thomas Church.
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Locally sourced flint wall with sandstone repairs to the windows.  ‘St. Mary the Virgin’, Walkern.
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Purbeck Marble effigy of a knight in a suit of chain armour with the visor drawn down c1200 AD.  The fantastic carving is of William De Lanvalei of Walkern.
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Another example of incredible stained glass, ‘St. Mary the Virgin’, Walkern.
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A local ammonite, Ragstone, white Clunch or Totternhoe stone plus odd bits of Lower Greensand and even pebbles used in the construction of ‘St. Mary the Virgin’ in Pirton.

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‘St. Mary the Virgin’ in Pirton.






Thank you to Mike Howgate for the photos and captions below:  Mike organised the Teesdale trip of July for the AGS and the Kirkaldy Society.  Their leader was Brian Young, formerly with the British Geological Survey.

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‘Low Force’ with kayaks for scale
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The group inspecting a huge xenolith within the Whin Sill
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The Whin Sill at High Force
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Leader Brian Young explaining where we are geologically…………

 

 

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Water wheel erected at a lead mining museum
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Large Carboniferous Sigillaria tree stump in Stanhope churchyard
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Polished piece of Frosterly Marble  (fossil coral Dibunophyllum)
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John C………… being supported by a block of Frosterly marble
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Penny and Sheila dying to get home and put their feet up……..

 







More geological photos from anywhere and everywhere…..

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90cm (3ft) tall ‘Luton Puddingstone’.  It stood for centuries on the corner of Market Hill in Luton protecting the corner of an adjoining building.  At one time it was painted blue, eventually moved to a museum from where it was stolen, then later recovered.  Now at Stockwood Discovery Centre, Luton.
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Close up of the flint pebbles forming the conglomerate.
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A large polished Porphyry Granite bench in Stockwood Discovery Centre gardens.
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A mass of Feldspar phenocrysts.

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All photographs R.F.




 

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Basalt Columns at Reynisfjara “Black’ Beach, South Iceland.
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Blue Lagoon, Grindavikurbaer, SW Iceland.
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Retreating Solheimajokull Glacier, SE Iceland.
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Close up of ash stained Solheimajokull Glacier.

 

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‘Geysir’ geyser, Blaskogabyggo, South West Iceland.

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Bubbling hot springs in the Haukadalur Valley, Blaskogabyggo, SW Iceland.

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Gullfoss Falls, Hvita River, SW Iceland (people for scale).
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View across the Thingvellir rift valley, between the North American and Eurasian Plates.
All pictures RF.



Mike Howgate’s ‘walk’ on Thursday 6th April 2017 –

‘The Pulhamite Industry’ in Hertfordshire’.

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Restored Brick Kiln

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Clay Puddling Wheel

Pulhamite is an artificial stone which was produced at a site near Broxbourne station from the 1830’s to the 1930’s. It was used in the manufacture of rockeries, fernaries, grottos and landscape features some of which look remarkably geological. We met up at a cafe alongside the river Lea then went to see the remains of the works, a kiln and bug wheel. After lunch we visited the Lowewood Museum to see their exhibition on the Pulhamite industry, which is on until the 28th. of April then it was on to the High Leigh Conference Centre to examine a Pulhamite ‘Millstone Grit’ gorge.

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Pulhamite ‘Millstone Grit’ gorge and a happy group above enjoying Mike’s ‘Walk’.                                                            Thank you to Mike for the photographs.



Iron Meteor

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Gibeon Iron Meteorite.  132mm long and 2.8 kilos in weight and an iron-nickel alloy.  From the famous Gibeon impact site in Namibia, West Africa.
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Another view…A number of huge pieces from the same meteor are on show in Windhoek, capital of Namibia.  Many thanks to C.D. for allowing me to photograph this piece.






Southbank Foreshore walk with John Wong + some hardy AGS members 2nd March 2017

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Foreshore and St.Pauls + Millennium Bridge.
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Not sure what we will find but one never knows……
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Looks like flint, bricks, debris, chalk, limestone, granite, pebbles, sand….
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This is the group that braved the cold and had a great day.
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This is Diana’s best find. A piece of Acropora coral, very nice!
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These are some of the other finds: animal teeth; animal bones; a marine shackle; c17th clay pipe bowl +stems (lots); chalk, boat nail, coal with fossilised wood; flint burrow cast; shells; pottery; glass; an acorn cupule or cap.
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Clay pipe items found on the foreshore and how the pipes would have looked.                                                                       Thank you to John Cook for the photo.

This is just a small amount of the interesting artefacts and even fossils that were found.  Flint from being used as ballast in the past, as well as an old building material.   Chalk from the ‘barge beds’ that were laid down on the shore for the flat bottomed barges to settle on when the tide was out.  Large amounts of animal bones from restaurants and suchlike alongside the river in the past.  Countless pipe stems and bowls from smokers past.  A small bowl from the days when tobacco was much more expensive, larger bowls from more recently.  Countless pieces of pottery, plain, decorated, glazed.  Numerous pieces of iron work and steel from old boats broken up on the Thames shore.  Coal from the loading wharfs that were scattered along the Thames.  Lots of sand that had been deposited onto the shore for the 1951 Festival of Britain.  Oyster shells, remains from an old fashioned meal.  Tons of brickwork and stones from the Blitz and old wharfs and buildings that have gone to the Thames…..and a suspected Septarian Nodule or Concretion.

More photographs of the remaining part of the day……

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 Two sandstone paving slabs on Blackfriars Bridge, showing Liesegang rings.
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Waterloo or ‘Ladies’ Bridge.  Large structural pillar built of Calcarenite current bedded Portland limestone with numerous oyster shell fragments and ….
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…reef building algae Solenopora portlandica showing growth rings.  Sometimes said to resemble cauliflower florets.
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Flooring in the Southbank Centre. Carboniferous Derbydene crinoidal limestone. Too nice to walk on….
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Styolites have dissolved away an area of the crinoid fossils.
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Bronze statue of Mandela mounted on a medium grained Gabbro plinth,         2 billion years old known as ‘Belfast Black’ from Mpumalanga S.A.
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-near Victoria Embankment Gardens.

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All Saints Church Fulham.  The original 96ft. tower built of Kentish Ragstone around 1440.
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Age and pollution taking its toll on the Cretaceous limestone.
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Fulham Palace with diaper brickwork.
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John C. looking very comfortable in the ‘Bishops Tree’- Fulham Palace.

London Sights

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Sculptured and polished pavement rock at Millbank, SW1
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Large carved Gypsum Alabaster figures – Jacob and the Angel.                        Tate Britain, Millbank.                  Jacob Epstein 1940-1.
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Close-up: Angel supporting Jacob who has just collapsed…..





CRYSTAL PALACE DINOSAURS

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Plesiosaurus + Ichthyosaurus – Jurassic
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Teleosaurus – Triassic to Cretaceous
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Teleosaurus + Plesiosaurus + intruders
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Megalosaurus – Jurassic
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Iguanodon, with nose spike – Cretaceous
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Iguanodon close up

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Section of ‘Geological Strata’ with simulated Carboniferous Limestone + Sandstone + Ironstone bands with faults and coal seam.                                               Photos RF



AGS Field Trip led by John Wong to Bardon Hill Quarry, Leicestershire.

29th October 2016

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This was the view down into the quarry. Fortunately a mini bus was available……..
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Then the mist rolled in……but cleared almost immediately.
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Dacite on the way down………
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Andesite Breccia showing water-laid sedimentary structures.                                                                              The steps or ‘Benches’ surrounding the quarry can clearly be seen.
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Drilling machine for explosive charges.

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Giant geological bucket for samples…….figure in background for comparison.
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Quartz vein in the form of a boudinage structure in andesitic volcanoclastic sediment.
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Light grey, fine-grained, graded and laminated marine sediment.
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In the upper background, Triassic Mercia Mudstone deposits fill a paleo-valley, which is a Triassic unconformity on Precambrian Bradgate Formation volcanoclastic rock.
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A fantastic day at an end……..

Some samples from the quarry:

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IMG_7879.jpgPictures by RF


Thank you AGS member Penny Badham for sharing some of her collection below:

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Serpentine Chameleon – carved by Emmy Frester c.1960.
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Flint nodule-Collected 1971 in Potters Bar garden. 1065grms. Polished by Frank Stokes.
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Nummulites from Oman. Collected from building aggregate – 2009.
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Polished examples of:  666-Gneiss   876-Clastic Rock   1076-Rhyolite   403-Breccia      498-Schist    661-Serpentine   694-Phyllite             692-Porphoritic Rock    1661-Olivine Gabbro – by Frank Stokes.
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Chess Set – Gypsum, Serpentine and Mudstone.                   Carved + polished by Frank Stokes.

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Pictures by R.F.



Three fantastic AGS field trips pictured below, make sure you go on the next one!

Mike’s ‘Bucks Geology and Churches trip # 2’

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Casts and moulds of bivalves in Portland Stone in Dinton Church, Bucks. (Mike Howgate)
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Dragons and the Tympanum of Dinton Church. (Mike Howgate)






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Red sand ‘road’ into Aspley Heath
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Some of the 13 adventurer’s heading off to the woods….
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Brown sand & Ironstone ‘Pavement’
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‘Road’ cutting with exposures
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John’s trowel with examples
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Ironstone with fossilised wood.
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 Ironstone external mould of possible Pholadomya.
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Danesborough iron age Hill Fort. Extensive remains of rampart and ditch defences. Wavendon Woods.
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Beech and pine trees
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St. Mary Magdalene, Little Brickhill Church. (John Wong)
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Part of the Church wall.  Ironstone+clay tiles+Totternhoe Stone. (John Wong)






P1110286.jpgGreat Tew Quarry,  Oxfordshire with John Wong and all.
Picture taken by Paul, our guide & quarry manager.
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Giant Ironstone blocks, 5 – 10 tons each for building work.
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Waiting to be cut out.
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Almost falling out of the hill side.
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Ironstone 180my.
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St. Michael & All Angels Church, Great Tew, Oxfordshire.  Ironstone built, c1400 A.D.
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Ammonites from the quarry.
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Crystals of Gypsum from the clay.
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Details of the Ammonites.

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Ironstone pieces & Clay from the quarry.
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Rhynchonellid Brachiopod found by John Wong
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180my Ironstone Nautilus (11 kilos) with its smaller modern relation-Found by workmen in the Gt. Tew quarry.
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Another view showing sutures.







Swallow Holes at Water End, Hertfordshire (an SSSI) – GA Field Trip July 2016 with Mike Howgate. (he with the stick…..)

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Potterells Stream ‘overflow channel’……..
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……………disappearing into the underlying chalk to eventually join the river Colne.
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A ‘Swallow Hole’ of Mimmshall Brook near North Mimms, just one of several in the area.  These drain underground and eventually join the River Lea.

Thank you Sue Jacobs for the info and photos and two more below…

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Lowestoft Ness, the most Easterly point in Britain. The sea defence blocks include gneiss + larvikite from Norway.
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Reigate Lower Greensand ‘Caves’ where the white sand was extracted for glass manufacture in 19th c.  Man-made self supporting tunnels due to the unusual quartz grains locking together and being strong in compression. If you want to visit, see ‘Links’ for the website.

Other interesting geological bits below……………




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Thank you to Julia & Doug Daniels for the photos of some of their minerals, below.

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Small Smoky Quartz
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Rulilated Quartz
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Morion- type of smoky Quartz
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Small Amethyst
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Rose Crystals
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Morion
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Amethyst Geode
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Beautiful Carved Quartz Rose
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Chalcedony – type of Quartz

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Mike Howgate’s well attended field trip to Stonesfield, Oxfordshire, 2015.
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The way down!  Into the abyss.  A ‘slate’ mine shaft which the bravest descended.
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Not a very inviting entrance at the bottom of the shaft. But fascinating.
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The Boss was there!
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Health and safety headwear
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This is why the village is called ‘Stonesfield’
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An exposure of the limestone.
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‘Slate’ uses.
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The ‘Slate’ mine owner also provided refreshments……
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Followed by a visit to Churchill, Oxfordshire

The Stonesfield photos supplied by Mike Howgate and Richard Furminger.


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Some heavily disguised members of the AGS on a Field Trip to Dunstable in November 2014.  They were looking for the source of the River Ver and only John Wong knew where it was…..
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Was this it?
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Thank you Sue Jacobs for the information and photographs.

Janice Nicholson sent me the three photographs below –

An interesting (oolitic) limestone tracery window in a Church in Essex with Anglo Saxon connections.  Janice wondered what Winston Churchill was doing up there on the wall?

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A very weather worn carved head of King ?
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A sandstone Victorian viaduct in Scotland.

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Seed Fern. Natural History Museum (behind glass).
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From ‘Advanced Text-Book of Geology’ by David Page. 1876.  W.Blackwood&Sons. Original price 9d.
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2.5cm. Twinned Crystal of Fluorite. Hilton mine, Scordale, Cumbria.
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Corals-Lithostrotion. Yorkdale series. Carboniferous. Nappa, Yorkshire.
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A jumble of ‘Tuning Fork’ Graptolites. Didymograptus murchisoni. Ordovician. S.Wales.
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Turtle Coprolites in Limonite. Oligocene 30-35my. Washington State, USA.
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Calcified Promicroceras Ammonites. Black Ven Marl, Charmouth, Dorset. Lower Jurassic. Photographed with kind permission Mr.Paddy Howe of The Fossil Workshop, Lyme Regis.
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Polished Clinochlore crystals. Ural Mountains, Russia.
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Blue John semiprecious stone. Fluorite. Treat Cliff Cavern, Castletown, Derbyshire.

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Belemnite – 18cm x 1.8cm. dia.  Stewartby Brickworks, Bedfordshire. Photographed by kind permission of the finder, Olwen Jones.
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Blue Cavansite Cystals with white Stilbite on a volcanic rock groundmass. Pune, India.
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Hematite – Botryoidal (blobby) form. Morocco, North Africa.
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Crustacean Burrow in Chalk – Hunstanton Norfolk.
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Mammoth Tooth.
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Belemnite Battlefield – Lower Jurassic Malmstone, Edge Hill, Banbury, Warwickshire.
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Crinoid Scyphocrinites elegans – calyx detail. Morocco.
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Gran Canaria ‘Ice-cream’ Tuff Layers. The green colourisation  caused by Chlorite and Hematite is responsible for the pink.
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Ammonite Harpoceras sp. – Upper Lias, Dorset.
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Small Essex Man.   Flint Pseudo Fossil – Epping Forest.
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Crystal Palace Dinosaur Park.  Iguanodon with Nose Spike.
Stromatolite-Cyanobacteria Growth
Stromatolite – Cyanobacteria Growth.
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Dover Cliffs Erosion.
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Fossil Coral Wall – Bristol.
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Pink Aplite Vein in Granite – Jersey C.I.
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Ripple marks in Sandstone.
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Conglomerate – Jersey C.I.
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Pumice – South Wales Coast.  Origin?
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Barite (Baryte) Crystals.
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Cockscomb Baryte – Somerset
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Quartz Crystals – Minas Gerais, Brazil.
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Himalayas – Gigantic Tectonic Plate Movement.
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Mr. William (Strata) Smith’s Museum, Scarborough.

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Tigers Eye – type of Quartz. Polished to show off its remarkable optical quality called ‘Chatoyancy’.
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Malachite – Copper Carbonate Hydroxide mineral. From D.R. Congo, Central Africa.
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Diplomystus dentatus – Fossilised predatory fish. Green River Formation, USA. Eocene.

Pictures by R.F. unless otherwise credited.

Aerial photographs of Himalayas by kind permission L. Rybin.

Barringer Meteor Crater in Arizona – photographer unknown.

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