Saturday, 24 September 2016

Mapping Mountains – Significant Name Changes – 100m Twmpau

Bonc yr Hafod (SJ 311 469)

There has been a Significant Name Change to a hill that is listed in the 100m Twmpau, and the following details are in respect of a hill that was surveyed with the Trimble GeoXH 6000 on the 20th October 2015.

The criteria for the list that this name change applies to are:

100m Twmpau - All Welsh hills at and above 100m and below 200m in height that have 30m minimum drop, with the word Twmpau being an acronym standing for thirty welsh metre prominences and upward.

The hill is a part of the Moel y Gamelin range; this group of hills are situated in the north-eastern part of north Wales.  The hill overlooks the A 483 road and is positioned on the north-eastern outskirts of Johnstown and Rhosllanerchrugog.

The large stone construct at the entrance to the car park at the base of Bonc yr Hafod

Bonc yr Hafod (SJ 311 469)

The hill appeared in the 100m P30 list on Geoff Crowder’s website under an invented name of Bryn-y-hafod, with an accompanying note stating; Name from house to the South, with Hafod House being a large residence to the south of the hill.  

    Name from house to the South

During my early hill listing I thought it appropriate to invent a name for a hill if no name seemed to appear for it on Ordnance Survey maps of the day.  My preference was to use farm names and put Pen, Bryn or Moel in front of them and in this instance I prefixed the name of a large house with that of Bryn.  This is not a practice that I now advocate as with research either conducted locally or historically an appropriate name for the hill can usually be found and in this instance the name the hill is now listed by comes from the updated details on contemporary Ordnance Survey 1:25,000 Explorer maps.

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

Therefore, the name this hill is now listed by in the 100m Twmpau is Bonc yr Hafod, and this was derived from the Ordnance Survey 1:25,000 Explorer map.  

The full details for the hill are:

Group:  Moel y Gamelin

Name:  Bonc yr Hafod

Previously Listed Name:  Bryn-y-hafod
Summit Height:  152.7m (converted to OSGM15)

OS 1:50,000 map:  117

Summit Grid Reference:  SJ 31182 46940 
Drop:  43.9m (converted to OSGM15)

Myrddyn Phillips (September 2016)

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