Clogau (SJ 184 462)
There has been a
Significant Name Change to a hill that is now listed in the Y Pedwarau – The 400m Hills of Wales, with the summit height, bwlch height and their
locations, the drop and status of the hill estimated from contour interpolation
using the 5m contours on the OS Maps website.
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| Clogau (SJ 184 462) |
The criteria for the list that this name change applies to
are:
Y Pedwarau – The 400m Hills of Wales.
Welsh hills at or above 400m and below 500m in height that have 30m
minimum drop, accompanying the main Y Pedwarau list are five categories of sub
hills, with this hill being added to the 400m Sub-Pedwar category. The criteria for 400m Sub-Pedwar status being
all Welsh hills at or above 400m and below 500m in height that have 20m or more
and below 30m of drop. The list is
co-authored by Myrddyn Phillips and Aled Williams and is published on Mapping Mountains in Google Doc format.
The hill is adjoined
to the Moel y Gamelin group of hills, which are situated in the north-eastern part of North Wales (Region A,
Sub-Region A2), and it is positioned with the A542
road to its north-east, the A5104 road to its north-west and the A5 road to its
south, and has the town of Llangollen towards the south-east.
When the original 400m height band of Welsh P30
hills were published on Geoff Crowder’s v-g.me website this hill was not
included in the Hills to be surveyed sub list that accompanied
the main P30 list, as it did not meet the criteria then used in this sub
category.
The sub list was standardised and interpolated
heights and drop values also included, but it was only when compiling The Welsh P15s that this hill was listed with 17m of drop based on the 455m summit spot
height that appears on the Ordnance Survey 1:25,000 Explorer map and the 438m
spot height that appears in the vicinity of this hill’s bwlch on the Ordnance
Survey Vector Map Local hosted on the Geograph website and which is entitled
the Interactive Coverage Map, and therefore this hill was not included in the 1st
edition of the Y Pedwarau published
by Europeaklist in May 2013.
 |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
The hill was originally listed in The Welsh P15s
by the name of Berwyn Quarry, which is a name that appears adjacent to this
hill’s summit on the contemporary Ordnance Survey 1:25,000 Explorer map.
Since publication of the
1st edition of Y Pedwarau 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. Two of the historic maps now available are the
Ordnance Survey Draft Surveyors map which formed the basis for the first
publicly available Ordnance Survey One-Inch ‘Old Series’ map and it is the
series of Ordnance Survey Six-Inch maps that form the basis for the change in
this hill’s listed name.
 |
| Extract from the series of Ordnance Survey Six-Inch maps |
Therefore, the name this hill is
now listed by in the Y Pedwarau – The 400m Hills of Wales is Clogau and this was derived from
the series
of Ordnance Survey Six-Inch maps, with the Welsh name for the quarry being
prioritised over the English name which for listing purposes is standard
practice.
The full details for the
hill are:
Group: Moel y Gamelin
Name: Clogau
Previously Listed
Name: Berwyn Quarry
OS 1:50,000 map: 116
Summit Height: c 460m
(interpolation)
Summit Grid Reference:
SJ 18455 46229 (interpolation)
Bwlch Height: c 439m (interpolation)
Bwlch Grid
Reference: SJ 18304 46343
(interpolation)
Drop: c 21m
Myrddyn Phillips and
Aled Williams (December 2019)
