Wednesday, 2 August 2017

Mapping Mountains – Significant Name Changes – Y Trichant


Teisen Priodas (SN 820 108)

This is the eightieth 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 13th June 2017.

The hill is a part of the Fforest Fawr group of hills, which is situated in the north-western part of South Wales (Region C, Sub-Region C2), and is positioned above the small community of Abercraf (Abercrave) to the north and Blaendulais (Seven Sisters) to the south. 

Teisen Priodas (SN 820 108)

The hill forms a part of the ridge known as Mynydd y Drum which has been extensively mined in its north-eastern section with the remaining highest natural summit listed as a Sub-Twmpau under the name of Mynydd y Drum at SN 80718 09753.

The hill is a part of the Nant Helen Opencast Mine and consists of landscaped waste spoil and its detection was dependent upon LIDAR data analysed by Kevin McGovern and then independently by Aled Williams and also by George Gradwell.

Prior to analysis of LIDAR data the hill had not appeared in any list, due to these analyses it was subsequently included in the Y Trichant, these are the 300m height band of hills within the Twmpau (thirty welsh metre prominences and upward) and its height, drop and status was confirmed by a survey with the Trimble GeoXH 6000.  

Extract from the Ordnance Survey 1:25,000 Explorer map with the expended ridge name of Mynydd y Drum and the extent of the Nant Helen Opencast Mine

When this hill was listed as a Trichant it appeared under the name of the extended ridge it is a part of; Mynydd y Drum, however after surveying it with the Trimble GeoXH 6000 I had the opportunity to discuss its name with workers at the Nant Helen Opencast Mine.

After visiting this hill I entered the workings of the Nant Helen Opencast Mine hoping to visit the adjacent north-easterly P30 and also make place-name enquiries, I was approached by two mine employees in separate vehicles, after apologising for being where I was I asked them about the name of the two new P30s, each of which is the result of mine spoil, both knew the higher hill as Teisen Priodas which when translated into English is the wedding cake, an apt name as it consists of three tiers and is relatively flat on top.

Therefore the name this hill is now listed by in the Y Trichant and the Twmpau is Teisen Priodas, with this name being prioritised over that of Mynydd y Drum as the former is a locally known name for an individual hill and the latter is the name given to the extended ridge that now consists of three individual hills; two P30s and a sub. 


The full details for the hill are:


Group:  Fforest Fawr

Name:  Teisen Priodas

Previously Listed Name:  Mynydd y Drum 

Summit Height:  337.9m (converted to OSGM15)

OS 1:50,000 map:  160

Summit Grid Reference:  SN 82013 10833  

Drop:  93.3m (converted to OSGM15)






Myrddyn Phillips (August 2017)




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