Mapping Mountains – Significant Name Changes – 200m Twmpau

 

Square Field (SJ 070 031) 

There has been a Significant Name Change to a hill that is listed in the 200m Twmpau, with the summit height, bwlch height and their locations, the drop and status of the hill confirmed by LIDAR analysis and a subsequent Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. 

Square Field (SJ 070 031)

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

200m Twmpau - Welsh hills at or above 200m and below 300m in height with 30m minimum drop, with an accompanying sub list entitled the 200m Sub-Twmpau with the criteria for this sub category being all Welsh hills at or above 200m and below 300m in height with 20m or more and below 30m of drop, with the word Twmpau being an acronym standing for thirty welsh metre prominences and upward. 

The 200m Twmpau by Myrddyn Phillips

The hill is adjoined to the Carnedd Wen group of hills which are situated in the south-eastern part of North Wales (Region A, Sub-Region A4), and it is encircled by minor roads, with also the A458 road to its north, the A470 road to its south-west and the B4389 road to its east, and has the village of Adfa towards the south south-west. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was included in the main P30 list and listed with a 300m summit height, based on the spot height that appears on the Ordnance Survey 1:25,000 Explorer map and listed by the name of Dwyrhiw, which is a prominent name that appears to the south-east of the summit on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map.

Dwyrhiw

300m

SJ070031

136

215

During my early hill listing I paid little regard to name placement on the 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 either inappropriate or where another name is viewed as being more appropriate. 

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

Five weeks after surveying the summit of this hill I re-visited with Alex Cameron.  This second visit gave opportunity to call at the landowning farm (SO 069 030) which is situated just below the end of the track which is adjacent to the summit and to its south.  I’d already been told by Ruth Davies of Llawnt Isaf (SJ 077 033) that John Watkins would be able to help and no doubt give me the field name for where the summit is situated.  John answered the door and we talked for 10-15 minutes.  He explained that his father came to the farm as a tenant in 1917 and then bought the farm from the local estate in 1921 when the estate was sold.  I drew a diagram of the farm and the access track leading from it to the paved lane, and the fields and their boundaries.  John told me that the field where the summit is situated is known as the Square Field and this was once made up of two fields, with the one nearer the paved road being known as the Clover Field.  Each is now a part of Square Field, and the field where the 300m spot height appears on the Ordnance Survey 1:25,000 Explorer map is known as the Meadow. 

John Watkins

Therefore, the name this hill is now listed by in the 200m Twmpau is Square Field, and this was derived from local enquiry.

 

The full details for the hill are:

Group:  Carnedd Wen

Name:  Square Field

Previously Listed Name:  Dwyrhiw   

OS 1:50,000 map:  136

Summit Height:  299.4m (converted to OSGM15, Trimble GeoXH 6000) 

Summit Grid Reference:  SJ 07034 03161 (Trimble GeoXH 6000) 

Bwlch Height:  253.6m (LIDAR) 

Bwlch Grid Reference:  SJ 06533 03161 (LIDAR) 

Drop:  45.8m (Trimble GeoXH 6000 summit and LIDAR bwlch)

 

Myrddyn Phillips (January 2021)