Mapping Mountains – Significant Name Changes – 100m Twmpau and Y Trechol – The Dominant Hills of Wales

Cock Hill (ST 153 750)

There has been a Significant Name Change to a hill that is listed in the 100m Twmpau and Y Trechol – The Dominant Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill confirmed by LIDAR analysis conducted by Myrddyn Phillips.

LIDAR image of Cock Hill (ST 153 750)

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

100m Twmpau - Welsh hills at or above 100m and below 200m in height with 30m minimum drop, with an accompanying sub list entitled the 100m Sub-Twmpau with the criteria for this sub category being all Welsh hills at or above 100m and below 200m 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.

Y Trechol – The Dominant Hills of Wales – Welsh P30 hills whose prominence equal or exceed half that of their absolute height.  With the criteria for Lesser Dominant status being those additional Welsh P30 hills whose prominence is between one third and half that of their absolute height.  The list is authored by Myrddyn Phillips with the Introduction to the start of the Mapping Mountains publication of this list appearing on the 3^rd December 2015.

The hill is adjoined to the Bro Morgannwg group of hills, which are situated in the southern part of South Wales (Region C, Sub-Region C2), and it has the A4232 road to its north and east and a minor road towards its south, and has the city of Caerdydd (Cardiff) towards the north-east.

The hill originally appeared in the 100m P30 list on Geoff Crowder’s v-g.me website under the name of Leckwith Hill, which is a name given a farm positioned to the south-east of the summit on contemporary Ordnance Survey 1:25,000 Explorer maps, and with an accompanying note stating; aka Cock Hill.

Leckwith Hill

115c

ST153750

171

151

aka Cock Hill.

 

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

Since publication of these P30 lists on Geoff Crowder’s v-g.me website there have been a number of Ordnance Survey maps made available online, some of these are historic 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 Vector Map Local hosted on the Geograph website, and which is entitled the Interactive Coverage Map.  In the case of this hill it is the series of Ordnance Survey Six-Inch maps that show the placement of the name Cock Hill to be prioritised indicating that it is applicable to the whole area of the hill, whilst that of Leckwith Hill is applicable to a farm positioned to the south-east of the summit.

Extract from the Ordnance Survey series of Six-Inch maps

Therefore, the name this hill is now listed by in the 100m Twmpau and Y Trechol – The Dominant Hills of Wales is Cock Hill, and the confirmation of the placement of this name was derived from the series of Ordnance Survey Six-Inch maps. 

The full details for the hill are:

Group:  Bro Morgannwg

Name:  Cock Hill

Previously Listed Name:  Leckwith Hill 

OS 1:50,000 map:  171

Summit Height:  115.6m (LIDAR, natural summit)

Summit Grid Reference:  ST 15303 75089 (LIDAR, natural summit)

Bwlch Height:  46.3m (LIDAR)

Bwlch Grid Reference:  ST 13392 74714 (LIDAR) 

Drop:  69.3m (LIDAR)

Dominance:  59.92% (LIDAR)

Myrddyn Phillips (September 2019)