Wednesday, 26 October 2016

Mapping Mountains – Significant Name Changes – Y Pedwarau

Pen Crwn (SN 963 736)

This is the fifty fourth post under the heading of Significant Name Changes, and the following details are in respect of a hill that was surveyed with the Trimble GeoXH 6000 on the 12th March 2016.

The hill is part of the group of hills associated with Pegwn Mawr, this range of hills is situated in the north-eastern part of Mid and West Wales.  The hill is positioned to the south-west of the small community of Pant-y-dŵr and to the north of Rhaeadr Gwy (Rhayader).

The Trimble GeoXH 6000 gathering data at the summit of Pen Crwn

The hill appeared in the 400m P30 list on Geoff Crowder’s website under the name of Cefn Lletyhywel, which is a name that appeared close to the summit of the hill on Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer maps of the day.  This listing of hills is now co-authored with Aled Williams and known as Y Pedwarau, and the height and drop of the hill was confirmed by the survey with the Trimble.  

Cefn Lletyhywel

During my early hill listing I paid little regard to name placement on a map, or the meaning of names and to what feature the name was appropriately applied to.  Therefore I prioritised names for listing purposes that I now understand are inappropriate, and Cefn Lletyhywel is such an example as this name has been consistently applied by the Ordnance Survey to land below and to the south of the summit of this hill, whilst a number of different scaled Ordnance Survey maps position the name Pen Crwn as applicable to land taking in the summit of this hill.  

Extract from the Ordnance Survey series of Six-Inch maps

Extract from the Ordnance Survey 1:25,000 historical map

Extract from the current Ordnance Survey 1:25,000 Explorer map

Therefore the name this hill is now listed by in Y Pedwarau (Europeaklist May 2013 and Haroldstreet January 2014) is Pen Crwn and this was derived from a number of different scaled Ordnance Survey maps that place this name applicable to land that takes in the summit of this hill.

The full details for the hill are:

Group:  Pegwn Mawr

Name:  Pen Crwn

Previously Listed Name:  Cefn Lletyhywel 

Summit Height:  486.7m (converted to OSGM15)

OS 1:50,000 map:  136, 147

Summit Grid Reference:  SN 96320 73629
Drop:  52.0m

Myrddyn Phillips and Aled Williams (October 2016)

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