Friday, 14 October 2016

Mapping Mountains – Significant Name Changes – 200m Twmpau

Bwlch Clump (SJ 170 108)

This is the forty eighth 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 20th January 2016.

The hill is part of the Carnedd Wen range, which is an extensive group of hills situated in the southern part of north Wales.  The hill is positioned between the small community of Meifod to its north-west and Cegidfa (Guilsfield) to its east.

Bwlch Clump (SJ 170 108)

The hill appeared in the 200m P30 list on Geoff Crowder’s website under the partly invented name Pen y Bryn Wood, with an accompanying note stating; Name from wood to the North-East.  The listing this hill is now a part of is named Twmpau (thirty welsh metre prominences and upward) and its height and drop was confirmed by the survey with the Trimble.  

Pen y Bryn Wood
    Name from wood to the North-East

During my early hill listing I thought it appropriate to either invent a name for a hill, or use a name that appeared near to the summit of the hill on Ordnance Survey maps of the day.  My preference was to use farm names and put Pen, Bryn or Moel in front of them or as in this instance, use the name of the wood to the north-east of the summit and prefix it with the words Pen y.  This is not a practice that I now advocate as with a little research either conducted locally or historically an appropriate name for the hill can usually be found.  

Since publication of these P30 lists on Geoff Crowder’s website there have been a number of Ordnance Survey maps made available online, some of these are historical such as the series of Six-Inch maps on the National Library of Scotland website, whilst others are current and digitally updated such as the enlarged map on the Geograph website, and it was the combination of these two maps that confirmed that Bwlch Clump is the name of this hill. 

Extract from the series of Ordnance Survey Six-Inch maps

Extract from the Ordnance Survey enlarged map on the Geograph website

Therefore the name this hill is now listed by in the Twmpau is Bwlch Clump, and this was derived from the series of Ordnance Survey Six-Inch maps and the Ordnance Survey enlarged mapping that appears on the Geograph website.  This mapping became publicly available after the original P30 lists were published on Geoff’s website.

The full details for the hill are:

Group:  Carnedd Wen

Name:  Bwlch Clump

Previously Listed Name:  Pen y Bryn Wood 

Summit Height:  263.9m (converted to OSGM15)

OS 1:50,000 map:  125

Summit Grid Reference:  SJ 17063 10813 

Drop:  29.1m (converted to OSGM15)

Myrddyn Phillips (October 2016)

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