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FIELD VISITS 2015
 
A Report of LGA Field Events held during Summer 2015
 


FIELD PROGRAMME 2015 EXCURSION DETAILS PREVIOUS FIELD PROGRAMMES

Field Visit Reports 2015 - click to view pdf (1.51 MB)
Click to View (1.51 MB)
The 2015 Field Visit Reports booklet - containing full reports for each excursion of the 2015 field calendar - can be viewed using the link on the right. The file size is 1.51 MB and the format is pdf.

Please note: The field reports are personal accounts of LGA field excursions, written by a members of the LGA, recording their impressions of the event. They are intended as a summary of the geology of the area visited. The routes described may not be suitable for use by individuals and/or groups and do not necessarily follow an established path or public right of way.

Field Programme: 2015

DATE & TIME SUBJECT LEADER
12 March 2015
Thursday Evening
Demonstration of Leeds University’s Flume Tank Prof Jeff Peakall
Leeds University
18 April 2015
Saturday Morning
Middle Coal Measure Sediments and their depositional environments near Barnsley Tony Felski
WYG Trust
17 May 2015
Sunday Afternoon
A geological walk around Hetchell Wood,
Scarcroft and Thorner
A Yorkshire Geology Month Event
Bill Fraser
LGA
6 June 2015
Saturday Daytime
Tracking Jurassic Dinosaurs on the East Coast – Burniston Beach, near Scarborough Dr Mike Romano
Sheffield University
4 July 2015
Saturday Daytime
Mam Tor Landslips – mass movement in Carboniferous strata Prof Dan Faulkner
Liverpool University
1 August 2015
Saturday Daytime
Upper Permian Group Zechstein Carbonates at Blackhall Rocks, near Hartlepool Mike Mawson
Durham University
23 August 2015
Sunday Daytime
Crummack Dale - New thoughts on the Norber erratics and the sub-Carboniferous Unconformity together with some petrology of the Lower Palaeozoic rocks Jack Soper
BGS Retired
David Turner
YGS
2 - 4 Oct 2015
Friday - Sunday
Residential Weekend: North Lakes – Braithwaite, near Keswick TBA

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Excursion Details
Thursday 12th March 2015 — Leeds University’s Flume Tank

Leader: Prof Jeff Peakall, University of Leeds.

Purpose:

This meeting accompanies Prof Peakall's recent lecture ‘Rivers under the sea’ and will demonstrate how the University’s flume tank is used in his research.

Saturday 18th April 2015 — Coal Measure Sediments, Barnsley

Leader: Tony Felski, WYG Trust.

Purpose:

To examine typical sediments and structures towards the top of the Pennine Middle Coal Measures Group and to interpret their environments.

Geology: Carboniferous.

Maps and references:

OS Explorer 278 - Sheffield & Barnsley.

OS Landranger 110 - Sheffield & Huddersfield.

BGS 1: 50,000 Sheet 78 - Wakefield.


Sunday 17th May 2015 — Hetchell Wood, Scarcroft & Thorner

Leader: Bill Fraser, Leeds Geological Association.

Purpose:

To examine outcrops which show that between 320 - 280 m.yrs ago conditions in this part of West Yorkshire changed from a tropical river delta to a hot dry desert which then became inundated by shallow seas which were constantly evaporating. Handout will be provided.

This event was part of the programme for Yorkshire Geology Month 2015.

Geology: Carboniferous, Permian.

Saturday 6th June 2015   —   Tracking Jurassic Dinosaurs

Leader: Dr Mike Romano, Sheffield University.

Purpose:

The geology of the upper part of the Middle Jurassic of Yorkshire will be investigated with a view to finding dinosaur footprints and placing them in an environmental setting. It will include some sedimentological analyses.

Geology: Jurassic.

Maps and references:

The Yorkshire Coast – GA Guide No. 34. 2000, P. E. Rawson & J. K. Wright. Itinerary 5.

Saturday 4th July 2015   —   Mam Tor Landslips

Leader: Prof Dan Faulkner, Liverpool University.

Purpose:

Dan will introduce the regional geology of Carboniferous of the Peak District which is partly responsible for producing the conditions leading to the Mam Tor landslip. This will involve observations of the Dinantian limestones, including Odin’s rake, a mineralized fault within the limestones, the Namurian Edale Shales and Mam Tor Beds. We will observe the scale and nature of the deformation within the landslip and consider how the style of deformation is influenced by lithology.

Geology: Carboniferous.

Maps and references:

OS Explorer OL 1 – The Peak District – Dark Peak area.

Stevenson, I.P. and Gaunt, G.D, 1971. Geology of the country around Chapel en le Frith, British Geological Survey, HMSO, London.

Rutter, E.H., Arkwright, C.J., Holloway, R.F. and Waghorn, D. 2003. Strains and displacements in the Mam Tor landslip, Derbyshire, England. J. Geol. Soc., 140, 735-744.

Green, S., Rutter, E.H. & Holloway, 2010. The effect of groundwater level and vegetation on creep of the Mam Tor landslide. Geology Today, 26, 134-139.


Saturday 1st August 2015 — Zechstein Carbonates at Blackhall Rocks

Leader: Mike Mawson, Durham University.

Purpose:

To examine the Upper Permian Zechstein Group (Magnesian Limestone) carbonates (limestones and dolomites) beautifully exposed in cliffs and caves along the County Durham coast at Blackhall Rocks, about 5 miles north of Hartlepool. Zechstein Group cycle 1, 2 and 3 carbonates (Z1C, Z2C and Z3C respectively) will be seen. The Z1C Ford Formation formed an eastward facing barrier-type reef during the Upper Permian. The reef has a bryozoan framework although much of it is in fact microbial; it is overlain by the Boulder Conglomerate, a storm-beach deposit consisting of reef-derived cobbles and boulders that formed after a relative sea-level fall that occurred towards the end of Z1C times but prior to amajor lowstand during which the ~ 100m thick Hartlepool Anhydrite was precipitated inmore basinward (easterly) locations. The Z2C Roker Formation, which, at this locality, directly overlies the reworked top of the Boulder Conglomerate, marks a return to carbonate production following a relative sea-level rise. At its base are ~ 20m of pisoid shoal facies and subtidal stromatolites, the latter containing unusual ripple-like sedimentary structures which are well seen in the distinctive 1.4m thick Crinkly Bed which occurs near the base of the Z2C but are also found within large overlying domical stromatolites that are commonly over 10m wide (!) and have a relief of over 1m. Oolites capping the Roker Formation are of economic significance as they form oil and gas reservoirs onshore in the UK as well as in Poland and elsewhere on the continent and in the North Sea. The Z2C is succeeded by the second cycle evaporites of the Fordon Formation which are here represented at outcrop by a 1.8m thick dissolution residue, the equivalent of very thick halite and polyhalite deposits found in the basin-centre. These rocks, which were deposited during another major lowstand of sea-level, form the seals to many gas reservoirs in the Southern North Sea and also, more recently, have become of interest as a source of potash. The residue is sharply overlain by the Z3C Seaham Formation which is collapse brecciated and contains well developed concretionary fabrics: it was deposited following a major marine transgression and consists largely of offshore marine facies.

Geology: Permian.

Maps and references:

Ordnance Survey: 1: 50,000 Landranger 93 - Middlesbrough, 1: 25,000 Explorer 308 - Durham & Sunderland.

British Geological Survey: 1: 50,000 Sheet 27 - Durham and West Hartlepool.

Smith, D.B. (1995). Marine Permian of England. Geological conservation review series no.8. Chapman & Hall. This book contains a description of the geology of Blackhall Rocks that can also be accessed using the following link: http://jncc.defra.gov.uk/pdf/gcrdb/GCRsiteaccount3016.pdf


Sunday 23rd August 2015 — Crummack Dale

Leader: Jack Soper & David Turner, BGS Retired & Yorkshire Geological Society.

Purpose:

To consider and discuss new thoughts on the Norber erratics and the sub-Carboniferous unconformity. The opportunity will be taken to examine the petrology of some of the Lower Palaeozoic rocks including the Austwick Formation turbidites and also the Horton Flags.

Geology: Lower Palaeozoic.

Maps and references:

Ordnance Survey: 1: 25,000 OL2 - Yorkshire Dales, Southern & Western.

BGS: 1: 50,000 Sheet 60 - Settle

BGS Memoir Geology of the country around Settle, RS Arthurton, EW Johnson & DJC Mundy 1988.

Yorkshire Rocks & Landscape, A Field Guide, Editors: Scruton C & Powell, J. 3rd edition 2006, Chapter 1.

Peter J Vincent, Peter Wilson, Tom C Lord, Christoph Schnabel, Klause M Wilcken: cosmogenic isotope (36CI) surface exposure dating of the Norber erratics, Yorkshire Dales: Further constraints on the timing of the LGM deglaciation in Britain. Proceeds of the Geologists’ Association, Volume 121, 2010, pp 24- 31.


Fri 2nd - Sun 4th Oct 2015    —    Residential Weekend: North Lakes

Leader: TBA.


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Previous Field Programmes


Field Programme for 2002

Field Programme for 2003

Field Programme for 2004

Field Programme for 2005

Field Programme for 2006

Field Programme for 2007

Field Programme for 2008

Field Programme for 2009

Field Programme for 2010

Field Programme for 2011

Field Programme for 2012

Field Programme for 2013

Field Programme for 2014

Field Programme for 2016

Current Field Programme




 
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