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UID:35@cumberland-geol-soc.org.uk
DTSTART;TZID=Europe/London:20210609T180000
DTEND;TZID=Europe/London:20210609T180000
DTSTAMP:20210601T151305Z
URL:https://www.cumberland-geol-soc.org.uk/events/kirkstile-slump-formatio
 n/
SUMMARY:Slump Folding in Kirkstile Formation\, Wythop Woods
DESCRIPTION:WEDNESDAY 9 JUNE\nSLUMP FOLDING IN KIRKSTILE FORMATION\, WYTHOP
  WOODS\nLeader Phil Davies\nMeet at 6.00 pm at Beck Wythop Car Park\, alon
 gside Bassenthwaite Lake NY 214284. NB This is the one at the Keswick end 
 of the dual carriageway on the A66\, not the Woodend carpark at the Thornt
 hwaite junction. It's a 'there and back' route. The outbound leg is about 
 a mile gently uphill. The tracks aren't too rough - stout footwear is alwa
 ys a good idea\, but not necessarily heavy boots for this one.\n\nThe purp
 ose of the trip is to examine Ordovician Kirk Stile Formation (part of the
  Skiddaw Group) which is well exposed in about ten forestry track cuttings
 . Everything can be seen conveniently from track level.\nThe mudstones\, s
 iltstones and sandstones are strongly affected by slump folding\, probably
  influenced by later tectonic folding as well. Some of the slumps are fair
 ly dramatic 'crumples'. At least one fold has a neat 'v' shape\, somewhat 
 out of character with the crumpled / curved slump folds. That doesn't mean
  it isn't also a slump feature! Some very tight folding is also present\, 
 but not so easy to spot.\n\nDespite the rather chaotic first impression\, 
 a general structural pattern can be revealed. Most bedding dips are toward
 s the SE or NW - the NE to SW strike is reflected in the trends of the axe
 s of small folds that are visible in the cuttings. Fold axes generally plu
 nge at shallow angles. The limb of one fold can be examined\, and the axis
  can be seen to be curved.\n\nThere must be faults of varying magnitude th
 at juxtapose rock units of different bedding orientation. Some faults can 
 be seen in the cuttings.\n\nThere is at least one suspected intrusion - so
 mething to look out for and discuss. We should also consider the range of 
 sedimentary strata and if there are any believable way-up indicators.\n\nT
 his is a pleasant place for a walk\, and this trip could be regarded as an
  introduction for further explorations across to Lothwaite and Peil Wyke. 
 The structural configuration around Peil Wyke forestry cuttings (to the no
 rth) is superficially similar to that in Wythop Woods. However there is an
  area in between where the bedding dip is predominantly to the south\, whi
 ch is a bit of a head-scratcher. BGS publications refer to a Wythop Syncli
 ne - perhaps this 'big picture' interpretation has been deduced from consi
 deration of interfaces of the Kirk Stile Formation with underlying Loweswa
 ter Formation but it's hard to reconcile this with evidence in the forestr
 y cuttings. Discuss!
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