Sunday, 16 October 2016

Mapping Mountains – Significant Name Changes – 200m Twmpau

Garreg Mountain (SJ 133 782)

This is the forty ninth 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 23rd January 2016.

The hill is part of the Bryniau Clwyd range, which is an extensive group of hills situated in the north-eastern part of north Wales.  The hill is positioned between the small communities of Trelogan and Berthengam to the north-west, Chwitffordd (Whitford) to the east and Gorsedd to the south-east.

The Trimble GeoXH 6000 gathering data at the summit of Garreg Mountain

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

Pen Coed y Garreg
    Name from wood at the summit

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 at the summit of the hill and prefix it with the word Pen.  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.  Two of the historical maps now available are the Ordnance Survey Draft Surveyors map which formed the basis for the Ordnance Survey One-Inch ‘Old Series’ map, and it was these maps that name the hill as Garreg Mountain.

Extract from the Ordnance Survey Draft Surveyors map

Extract from the Ordnance Survey One-Inch 'Old Series' map

Therefore the name this hill is now listed by in the Twmpau is Garreg Mountain, and this was derived from the Ordnance Survey Draft Surveyors map and the Ordnance Survey One-Inch ‘Old Series’ map.  This mapping became publicly available after the original P30 lists were published on Geoff’s website.

The full details for the hill are:

Group:  Bryniau Clwyd

Name:  Garreg Mountain

Previously Listed Name:  Pen Coed y Garreg 

Summit Height:  247.1m (converted to OSGM15)

OS 1:50,000 map:  116

Summit Grid Reference:  SJ 13361 78264 

Drop:  c 53m

Myrddyn Phillips (October 2016)

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