As an addendum to Jack's field guide, as well as to Margaret Woods'
Welsh-English guide to the geology of the Rhoscolyn area, list members, or
anybody planning a trip to Anglesey, may find it useful to run or download
the Google Earth file Anglesey.kmz, currently archived as :
http://instruct.uwo.ca/earth-sci/fieldlog/Google_Earth/Anglesey.kmz .
Anglesey now - at last - has high resolution GE coverage, so that all
outcrops are clearly visible in exagerated 3-D!! The .kml file has recently
been updated to include the georegistered map images that provide the basis
of the discussion between Jack Treagus and Takahiro Kawai concerning the
structure of the blueschist belt in Anglesey. (Journal of Met Geol, 2007,
25, p. 507). Does the variation in the strike and dip of the foliation fit a
model of upright or recumbent folding. Is there a fault along the
barroisite-in isograd? Does the 560 Ma blueschist belt represents a deeply
exhumed extensional core complex within Late Proterozoic obducted oceanic
crust? Any comments?
A complete chronologically ordered list of references relevant to
the geology of Anglesey, modified and updated from an alphabetical list
created by Emlyn Phillips, can also be accessed as:
http://instruct.uwo.ca/earth-sci/fieldlog/cal_napp/napp/new_eng_maritimes/Anglesey/anglesey_refs_chrono.doc
This supplements the more limited chronologically ordered reference list
with random notes at the htm web site:
http://instruct.uwo.ca/earth-sci/fieldlog/cal_napp/napp/new_eng_maritimes/Anglesey/anglesey.htm
This document also includes a cartoon perspective based on recent
geochronologic and metamorphic studies in Anglesey and the Welsh Border
region, Emlyn Phillips' work on the sedimentary facies of the Mona Group,
and the assumption that the Rhyd Y Bont complex is the remains of an
obducted Paleozoic ophiolite unrelated to the mafic rocks of the Late
Proterozoic oceanic crust of the blueschist belt.
----- Original Message -----
From: "Jack Treagus" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, April 09, 2009 11:51 AM
Subject: Anglesey Geology - a Field Guide by Jack Treagus
> Anglesey Geology - a Field Guide by Jack Treagus
>
> This is a pocket-sized (B5), spiral-bound, 168pp, colour-photo, guide to
> 14 easily-accessed sites around the coast of Anglesey (N Wales, UK).
> Eleven sites concern the low-grade metamorphic rocks of the Mona Complex,
> most involving the spectacularly displayed polyphase deformation, others
> include stromatolitic limestone and the famous melange. Two involve
> Ordovician conglomerates, one the Ordovician and Silurian mineralised
> rocks of Parys Mt and others feature folded Devonian red-beds, pot-holes
> in the Carboniferous Limestone and a section through a Pleistocene
> drumlin.
> Not available through bookshops (they take 33%); published by GeoMon,
> Anglesey Geopark, (financed by the Welsh Assembly and non-profit making
> for me)
> Available from http://www.geomon.org.uk/shop.htm or contact
> [log in to unmask]
>
|