Craig Dan y Rhiw (SS 708 940)
There has been a Significant Name Change to a hill
that is listed in the 30-99m Twmpau
and Y Trechol – The Dominant Hills of Wales, with the summit height, its
location, the drop and status of the hill confirmed by LIDAR analysis conducted
by Myrddyn Phillips.
LIDAR image of Craig Dan y Rhiw |
The criteria for the two listings that this name change
applies to are:
30-99m Twmpau - Welsh hills at or above 30m and below 100m in height with 30m minimum
drop, with an accompanying sub list entitled the 30-99m Sub-Twmpau with the criteria for this sub category being all
Welsh hills at or above 30m and below 100m 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, with
the Introduction to the Mapping Mountains publication of this list appearing on
the 3rd December 2015.
The hill is adjoined to the
Fforest Fawr group of hills, which are
situated in the western part of South Wales (Region C, Sub-Region C2), and it
is positioned with the Crymlyn Bog to its north-west, the Tennant Canal and the
A483 road to its south, the B4290 road to its east and the M4 to its north-east,
and has the town of Castell-nedd (Neath) towards its north-east.
The hill originally appeared in the 30-99m P30
list on Geoff Crowder’s v-g.me website under a partly invented, transposed and
directional name of Jersey Marine Hill
West Top, with
an accompanying note stating; Name from district
to the South-East.
Jersey Marine Hill West Top
|
89m
|
170
|
165
|
Name from district to the South-East
|
During my early hill listing I thought it
appropriate to either invent a name for a hill, or use a name that appeared
near to the summit of the hill on Ordnance Survey maps of the day. My preference was to use farm names and put Pen, Bryn
or Moel in front of them or as in
this instance transpose the name of what I presumed to be a district and add the
words Hill and West Top to it. This is not
a practice that I now advocate as with time and inclination place-name data can
be improved either by asking local people or by examining historic documents,
through this form of research an appropriate name for the hill can usually be
found.
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 historical 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. Both of these maps name a small crag on the
upper southern slopes of this hill as Craig Dan y Rhiw and as it is appropriate
in listing terms to use the name of a main named feature for that of the hill,
it is this name that this hill is now listed by.
Extract from the Ordnance Survey Vector Map Local hosted on the Geograph website |
Therefore the name this hill is now listed by in the 30-99m Twmpau and Y Trechol – The Dominant Hills of Wales is Craig Dan y Rhiw, and this was derived from the series of Ordnance Survey Six-Inch maps and the Ordnance Survey Vector Map Local hosted on the Geograph website, and which is entitled the Interactive Coverage Map. With the latter mapping only becoming publicly available after the original Welsh P30 lists were published on Geoff Crowder’s v-g.me website.
The full details for the hill are:
Group: Fforest Fawr
Name: Craig Dan y Rhiw
Previously Listed Name:
Jersey Marine Hill West Top
OS 1:50,000 map: 170
Summit Height: 88.4m
(LIDAR)
Summit Grid Reference:
SS 70808 94060 (LIDAR)
Bwlch Height: 50.6m (LIDAR)
Bwlch Grid Reference:
SS 70934 94360 (LIDAR)
Drop: 37.8m (LIDAR)
Dominance: 42.73% (LIDAR)
Myrddyn Phillips (April 2019)
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