Saturday, 17 November 2018

19th to 25th November 2018

NEXT WEEKS EVENTS

19th to 25th November 2018

THE FOLLOWING IS AN EXTRACT FROM BRISTOL AND WEST COUNTRY GEOLOGY CALENDARS

MORE DETAILS CAN BE FOUND IN THE BRISTOL AND THE WEST COUNTRY CALENDARS AND ON THE WEB SITES OF THE RELEVANT SOCIETY OR ORGANISATION.


MONDAY 19TH

Course - Geology of the Bristol and Gloucester Region.
When
Mon, 19 November, 19:30 – 21:30
Where
Wynstones School, Stroud Road, Whaddon, Gloucester (map)
Description
Geology of the Bristol and Gloucester Region. 
One of the most varied regions of Britain, spanning the major divisions of the Variscan Front/Bristol Channel-Bray Fault, and the Malvern fault/ Worcester Graben, incorporating rocks varying in age from late PreCambrian to Cretaceous, and three of the terranes making up the geological “jigsaw” of Britain. The course will cover roughly the area covered by the eponymous BGS publication in the British Regional Geology series (3rd edition 1992).  Starts Mon 17th September  for 10 weeks (not 22nd or29th Oct or 5th Nov), until 10th December   Held at Wynstones School, Stroud Road, Whaddon, Gloucester from 7.30-9.30pm on Mondays.  Cost £75 (including tea, coffee etc at breaktime!).

Contact Dave Green by email at davegeostudies@gmail.com, by phone at 01594 960858 and by post at Dave Green, Joys Green Farm, Lydbrook, Gloucestershire, GL17 9QU

Tuesday 20th

SMFS Evening Meeting
When
Tue, 20 November, 19:30 – 22:00
Where
The Friends' Meeting House, 1A, Ordnance Rd, Southampton. SO15 2AZ (map)
Description
On the Origin of Species in FortyFive Minutes! Presentation by Dr Neil Gostling.
Members’ Display Table: Minerals & Fossils from South America.

Wednesday 21st



Thursday 22nd

Course - Understanding Geology and Scenery around Ross-on-Wye
When
Thu, 22 November, 10:00 – 10:30
Description
Understanding Geology and Scenery around Ross-on-Wye 
Starts September 21st (not 25th Oct or 8th Nov), finishes 6th December.
This 10 week course aims to introduce you to the ways in which the varied and beautiful landscape round our area has come into being. The effects of folds, faults and tectonic dip in exposing  different rock types, and the past and present processes of uplift, weathering, erosion and deposition that have acted upon them, will be examined by reference to local scenery. Use will be made of local maps and cross-sections across them, both geological and topographic; together with specimens of local rocks. Contact Paul Mason on  01989 760399. Cost £60  Enrol  before 15th September to ensure that the course runs.

friday 23rd



Saturday 24th



Sunday 25th


Oxford Mineral Fossil Show
When
Sun, 25 November, 10:30 – 16:30
Where
Exeter Hall, Kidlington, north Oxford OX5 1AB (map)

Another landslide and its aftermath

Dealing with a Landslide

One of my favourite blogs - The Landslide Blog - has three posts about a major landslide on the Jinsha River on the borders of Tibet and Sichuan. The slide blocked the river and a huge lake formed. See HERE.

The landslide


The lake formed

Bolo flooded

Then huge efforts were made to breach the landslide - it looks as if a lot of material was removed. HERE is the blog about that.

A view from upstream of the Jinsha River landslide showing the lowering of the landslide and the cutting of a breach.

But repairing something like this causes damage. You can read about this HERE. Bridges were destroyed downstream.

Before and after photos of a bridge downstream destroyed by the water released by the breaching. It would have been rather worse if the landslide had been allowed to wash away and the flood to come unexpectedly.

This video shows the power of the water running through the landslide.


Thursday, 15 November 2018

Newly discovered impact crater?

Is there Something Under the Ice?

A source has brought this article from the BBC to my attention. It is based on this article in a scientific journal.

The suggestion is that there is a meteor impact crater under the Greenland Ice Sheet in North West Greenland. I rather like the fact that the Hiawatha Glacier runs over the supposed impact crater.

From various strands of evidence it is suggested that the 31 km wide depression, under almost a km of ice, was created by the impact of a 1.5 km wide iron asteroid sometime between 12,000 and three million years ago. No one has actually seen the crater or identified parts of the asteroid as yet. 

There is a suggestion that it is connected with the Cape York meteorite and the Younger Dryas. But much more information needs to be collected before informed speculation can begin. Uninformed speculation is straining at the leash!




Wednesday, 14 November 2018

Visit a fault scarp

Possible Field Trip?

If I ignore that this is in New Zealand, a field trip beckons to look at this fault scarp!



The scarp developed as a result of the magnitude 7.8 earthquake of the 14th November 2016. it is about 3.5m high.

You can get more details and lots more photos HERE

Saturday, 10 November 2018

12th to 18th November 2018

NEXT Weeks EVENTS

12th to 18th November 2018

THE FOLLOWING IS AN EXTRACT FROM BRISTOL AND WEST COUNTRY GEOLOGY CALENDARS

MORE DETAILS CAN BE FOUND IN THE BRISTOL AND THE WEST COUNTRY CALENDARS AND ON THE WEB SITES OF THE RELEVANT SOCIETY OR ORGANISATION.


MONDAY 12TH


Course - Geology of the Bristol and Gloucester Region.
When
Mon, 12 November, 19:30 – 21:30
Where
Wynstones School, Stroud Road, Whaddon, Gloucester (map)
Description
Geology of the Bristol and Gloucester Region. 
One of the most varied regions of Britain, spanning the major divisions of the Variscan Front/Bristol Channel-Bray Fault, and the Malvern fault/ Worcester Graben, incorporating rocks varying in age from late PreCambrian to Cretaceous, and three of the terranes making up the geological “jigsaw” of Britain. The course will cover roughly the area covered by the eponymous BGS publication in the British Regional Geology series (3rd edition 1992).  Starts Mon 17th September  for 10 weeks (not 22nd or29th Oct or 5th Nov), until 10th December   Held at Wynstones School, Stroud Road, Whaddon, Gloucester from 7.30-9.30pm on Mondays.  Cost £75 (including tea, coffee etc at breaktime!).

Contact Dave Green by email at davegeostudies@gmail.com, by phone at 01594 960858 and by post at Dave Green, Joys Green Farm, Lydbrook, Gloucestershire, GL17 9QU

TUESDAY 13TH


Cardiff University Lecture - When Sea levels Change...
When
Tue, 13 November, 18:30 – 20:00
Where
The 2018-2019 monthly Tuesday evening lectures in the School of Earth and Ocean Sciences will be held in the Wallace Lecture Theatre (0.13), Main Building, Cardiff University, Park Place, CF10 3AT. Lectures begin at 18.30. Booking is not needed. (map)
Description
When water levels change; stories of floods and tsunamis.
Sanjeev Gupta (UCL)
-------------------------------------

WEGA Lecture - Antarctic Glacial Change
When
Tue, 13 November, 19:30 – 21:00
Where
Wills Memorial Building, Bristol BS8 1RL, UK (map)
Description
Lecture by Dr Lucy Clarke (Uni of Glos),
“Unlocking the Archive: Antarctic Glacial Change”

WEDNESDAY 14th



Thursday 15th


Course - Understanding Geology and Scenery around Ross-on-Wye
When
Thu, 15 November, 10:00 – 10:30
Description
Understanding Geology and Scenery around Ross-on-Wye 
Starts September 21st (not 25th Oct or 8th Nov), finishes 6th December.
This 10 week course aims to introduce you to the ways in which the varied and beautiful landscape round our area has come into being. The effects of folds, faults and tectonic dip in exposing  different rock types, and the past and present processes of uplift, weathering, erosion and deposition that have acted upon them, will be examined by reference to local scenery. Use will be made of local maps and cross-sections across them, both geological and topographic; together with specimens of local rocks. Contact Paul Mason on  01989 760399. Cost £60  Enrol  before 15th September to ensure that the course runs.
----------------------------

Thornbury Geology Group, 7.30pm, The Chantry, Thornbury
When
Thu, 15 November, 19:00 – 21:30
Description
Thornbury Geology Group, 7.30pm at The Chantry, Thornbury, and every 3rd Thursday in the month.  

Friday 16th




Saturday 17th

DGAG ANNUAL DINNER AT THE WESSEX ROYALE HOTEL
WHEN
SATURDAY, 17 NOV 2018
WHERE
WESSEX ROYALE HOTEL, 32 HIGH WEST STREET, DORCHESTER, DORSET, DT1 1UP, UNITED KINGDOM (MAP)
DESCRIPTION
ANNUAL DINNER AT THE WESSEX ROYALE HOTEL, DORCHESTER. GUEST SPEAKER: ROBERT CHANDLER. MENU AND BOOKING FORM WILL BE IN THE AUTUMN NEWSLETTER 
---------------------------

NICK CHIDLAW - GEOLOGICAL WALK
WHEN
SATURDAY, 17 NOV 2018
WHERE
GLOUCESTERSHIRE, UK (MAP)
DESCRIPTION
ICE AGE & HOT DESERT: TWO GEOLOGICAL WALKS NEAR GLOUCESTER (SATURDAY 17TH NOVEMBER)



THE SEVERN VALLEY IMMEDIATELY NORTH OF GLOUCESTER COMPRISES A RURAL LANDSCAPE OF FARMLAND AND SCATTERED VILLAGES, PUNCTUATED BY ABRUPT, FLAT-TOPPED HILLS, AND EXTENSIVE TRACTS OF VALLEY FLOOR OVER WHICH THE TIDAL RIVER FLOWS SOUTH. THE GEOLOGICAL HISTORY OF THE AREA IS FASCINATING AND CONTRASTING. THE OLDEST STRATA, C. 200 MILLION YEARS OLD, ARE VERY GENTLY FOLDED INTO A BASIN STRUCTURE AND WERE LAID DOWN AS HOT DESERTS GAVE WAY TO SHALLOW TROPICAL SEAS IN LATE TRIASSIC / EARLY JURASSIC TIMES. THEY ARE EXPOSED IN CLIFFS ALONG THE RIVER. THE HILL TOPS AND VALLEY SIDES BELOW PRESERVE DEPOSITS LAID DOWN BY A GLACIER AND MELTWATERS DURING THE ICE AGE. AT THIS TIME, THE RIVER PROGRESSIVELY CUT DOWN ITS COURSE, AT ONE TIME REACHING BELOW ITS PRESENT LEVEL. WITH THE ENDING OF THE ICE AGE IN BRITAIN SOME 10,000 YEARS AGO, AND THE ASSOCIATED RISE IN SEA LEVEL, THE RIVER HAS BUILT UP ITS BROAD CLAYEY PLAIN, FREQUENTLY PRONE TO HAZARDOUS WINTER FLOODS. THIS COURSE COMPRISES A MORNING WALK (C. 4 MILES) AND AN AFTERNOON WALK (C. 3 MILES), BOTH GENTLY-PACED WITH FREQUENT STOPS TO DISCUSS THE GEOLOGY AND LANDFORMS.   



VOLUNTEER DRIVERS AMONGST THE FIELD PARTY WILL BE REQUIRED TO FACILITATE THE PLANNED WALKING - DO LET ME KNOW WHEN ENROLLING IF YOU CAN HELP IN THIS REGARD.  

TUITION FEE IS £27.00 PER PERSON PER COURSE.

IF YOU / ANYONE ELSE YOU KNOW WOULD LIKE TO ATTEND EITHER OR BOTH OF THESE COURSES, PLEASE FORWARD CHEQUE PAYABLE TO ME TO:

DR N CHIDLAW

8 SILVER STREET

DURSLEY,

GLOS.

GL11 4ND

BANK TRANS CAN BE ARRANGED IF YOU DO NOT USE CHEQUES - LET ME KNOW.

PLEASE PROVIDE ME WITH YOUR POSTAL ADDRESS - I WILL THEN BE ABLE TO SEND YOU YOUR COURSE HANDOUT(S) IN GOOD TIME BEFORE THE COURSES RUN, SHOULD THEY BECOME VIABLE.



THE DEADLINE FOR THE MINIMUM NUMBER (10) OF ENROLMENTS FOR BOTH COURSES IS THURSDAY 1ST NOVEMBER (JUST OVER 2 WEEKS BEFORE THE COURSES ARE PROPOSED TO RUN).   MAXIMUM NUMBER OF ENROLMENTS IS 30. IF THE MINIMUM OF ENROLMENTS IS REACHED BY THIS DEADLINE, THE ARRANGEMENTS WILL CONTINUE; IF NOT, THE COURSE WILL BE CANCELLED AND FEES RECEIVED WILL BE RETURNED TO THOSE WHO HAVE SENT THEM IN, SOON AFTERWARDS.

PLEASE NOTE THAT FOR EACH COURSE YOU WILL NEED TO:

ARRANGE YOUR OWN TRANSPORT (AND ACCOMMODATION SUCH AS B&B IF YOU LIVE BEYOND REASONABLE COMMUTING DISTANCE - TUTOR CAN ADVISE)

BRING YOUR OWN PACKED LUNCH(ES), AND ANY REFRESHMENTS (E.G. FLASK OF COFFEE, FRUIT JUICE, MINERAL WATER, HIGH ENERGY SNACKS ETC.)

WEAR STRONG FOOTWEAR WITH GOOD TREAD AND ANKLE SUPPORT, AND WARM WATERPROOF CLOTHING IF WEATHER IS POOR

WEAR HARD HATS WHEN BELOW ROCK FACES (BRING ONE, OR REQUEST FROM THE TUTOR IN ADVANCE OF THE COURSE(S) TO BORROW ONE)

YOU WOULD BE INSURED AGAINST ACCIDENT FOR THE DURATION OF BOTH COURSES.
--------------------------------


Sussex Mineral Show.
When
Sat, 17 November, 10:00 – 16:30
Where
Clair Hall, Haywards Heath, RH16 3DN. (map)

Sunday 18th


Nick Chidlaw - Geological Walk
When
Sunday, 18 Nov 2018
Where
Gloucestershire, UK (map)
Description
A GEOLOGICAL WALK IN ESCARPMENT COUNTRY, MID COTSWOLDS: Jurassic strata and landforms near and far (Sunday 18th November)



The steep escarpment of Jurassic rocks in the mid Cotswolds looks north-west across the broad low-lying Severn Vale, to the Welsh Borderland hills and beyond. This mainly rural, highly attractive landscape overlies a geological legacy of repeated tectonic plate collision and extension, uplift and erosion going back to Precambrian times. On this course you can learn to recognise these landforms, know of their underlying rocks, and understand how both came into being. Walking about 4 miles between Doverow Hill near Stonehouse across the valley of the river Frome to Selsley Common, we examine exposures of Early and Middle Jurassic strata in old quarries and pits, and lane cuttings. The Early Jurassic rocks here, mostly soft, muddy and sandy sedimentary deposits, were laid down in warm tropical seas overlying an active rift complex before the North Atlantic Ocean basin opened to the west; the overlying Middle Jurassic strata, mostly limestones with highly fossiliferous beds, were deposited when the seas became shallower and clearer and the crustal rifting died down. In later geological times, the Jurassic strata came under north-south tension, causing the rocks to develop parallel sets of faults running east-west, and displacements to occur. During the Ice Age, the River Severn and its tributaries progressively incised their courses, and landslides occurred on the escarpment as it came into being; these landslides continued to take place, notably at the end of the last cold climatic episode.  



Volunteer drivers amongst the field party will be required to facilitate the planned walking - do let me know when enrolling if you can help in this regard.  

Tuition fee is £27.00 per person per course.

If you / anyone else you know would like to attend either or both of these courses, please forward cheque payable to me to:

Dr N Chidlaw

8 Silver Street

Dursley,

Glos.

GL11 4ND

Bank trans can be arranged if you do not use cheques - let me know.

Please provide me with your postal address - I will then be able to send you your course handout(s) in good time before the courses run, should they become viable.



The deadline for the minimum number (10) of enrolments for both courses is Thursday 1st November (just over 2 weeks before the courses are proposed to run).   Maximum number of enrolments is 30. If the minimum of enrolments is reached by this deadline, the arrangements will continue; if not, the course will be cancelled and fees received will be returned to those who have sent them in, soon afterwards.

Please note that for each course you will need to:

Arrange your own transport (and accommodation such as B&B if you live beyond reasonable commuting distance - tutor can advise)

Bring your own packed lunch(es), and any refreshments (e.g. flask of coffee, fruit juice, mineral water, high energy snacks etc.)

Wear strong footwear with good tread and ankle support, and warm waterproof clothing if weather is poor

Wear hard hats when below rock faces (bring one, or request from the tutor in advance of the course(s) to borrow one)

You would be insured against accident for the duration of both courses.



Landslide video

What to Do in a Landslide - Stay Well Back!



The video above, taken in the Philippines, shows the dangers of landslides, it starts off fairly innocuously but quickly becomes extremely life threatening - watch the man on the balustrade - he is lucky to be alive. 

You can read more about it HERE.

Friday, 9 November 2018

How to be paranoid!

More Things to Worry About!

I'm being a bit flippant about this but this article about Alpine Tsunamis is well worth reading. 

The danger - if you are in the mountains and a lake is nearby - is tsunamis. Tsunami is Japanese for "harbour wave" - a wave where there should not be waves. In Japan they are usually caused by earthquakes but landslides into water can also cause them.

And that is the danger in Alpine regions. The author describes various events with casualties ranging from five to 60,000. The greatest danger is with moraine dammed lakes. If the dam fails vast quantities of water can be released into highly populated valleys. This is called a GLOF - a Glacial Lake Outburst Flood.

And if you live near Laguna Paron in Peru beware of GLOFs.

Laguna Paron (Cordillera Blanca, Peru) in 2009, a lake dammed by the glacier Hatunraju with a capacity of 75 million cubic meters. The lake is surrounded by a 250 meters high moraine.  If this dam fails an outburst of around 50 million cubic meters could flood the valleys downstream.



Sunday, 4 November 2018

Geological Sites of the Bristol Region (2018)

Geological Sites of the Bristol Region (2018)

This book has just been published. the foreword is by Professor Mike Benton and it costs £19.50. You can download some sample pages by clicking THIS LINK

You can get it from  the Bristol Museum shops at Bristol Museum and Art Gallery and M-Shed. Or visit their online shop HERE.




I bought the book last week from the City Museum. (NB closed on Mondays!)
It is not a standard excursion guide. The greater part of the book describes the most interesting RIGS sites, in alphabetical order, often in great detail. So to follow one geological period involves jumping from one part of the book to another. 

But it is good for its intended purpose - describing the geological sites of the Bristol Region.

The maps are fairly useless, you will need OS and Geological Survey maps to find your way about. But once on site the book is invaluable.