Mapping Mountains – Significant Name Changes – The Welsh P15s

Bishop’s Quarries (SH 766 829) 

There has been a Significant Name Change to a hill that is listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Bishop's Quarries (SH 766 829)

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

The Welsh P15s – Welsh hills with 15m minimum drop, irrespective of their height, with an accompanying sub list entitled the Welsh Sub-P15s, with the criteria for this sub category being all Welsh hills with 14m or more and below 15m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list appearing on Mapping Mountains on the 10^th May 2019. 

The Welsh P15s by Myrddyn Phillips

The hill is adjoined to the Mynydd Hiraethog group of hills which are situated in the northern part of North Wales (Region A, Sub-Region A2), and it is positioned encircled by minor roads with the A546 road farther to its south-west, and has the town of Llandudno towards the south-west.

When the listing that became known as The Welsh P15s was being compiled, this hill was listed under the point (Pt. c 197m) notation and included in the main list of P15s with an estimated c 15m of drop, based on an estimated c 197m summit height and an estimated c 182m bwlch height, with both heights based on interpolation of 5m contouring. 

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

Since the initial compilation of this list 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 were digitally updated such as the Ordnance Survey Vector Map Local that was hosted on the Geograph website and which was entitled the Interactive Coverage Map.  Whilst others are current and digitally updated such as the interactive mapping on the Magic Maps and WalkLakes websites and it is the series of Ordnance Survey Six-Inch maps that form the basis of the change in the listed name of this hill.

The Ordnance Survey series of Six-Inch maps formed the base map Ordnance Survey used for many decades leading to the production of the 1:10,000 Series of maps, both have now been superseded by the digitised Master Map.  The series of Six-Inch maps are excellent for name placement and especially so compared to the contemporary Ordnance Survey 1:25,000 Explorer map, and it is the series of Six-Inch maps that places the name of Bishop’s Quarries adjacent to the summit of this hill.

Extract from the Ordnance Survey series of Six-Inch maps

Therefore, the name this hill is now listed by in The Welsh P15s is Bishop’s Quarries and this was derived from the Ordnance Survey series of Six-Inch maps. 

 

The full details for the hill are: 

Group:  Mynydd Hiraethog 

Name:  Bishop’s Quarries

Previously Listed Name:  Pt. c 197m 

OS 1:50,000 map:  115

Summit Height:  198.5m (LIDAR) 

Summit Grid Reference:  SH 76660 82978 (LIDAR)               

Bwlch Height:  181.5m (LIDAR) 

Bwlch Grid Reference:  SH 76726 83136 (LIDAR) 

Drop:  17.0m (LIDAR) 

 

Myrddyn Phillips (October 2024)