Pen y Darren (SN 764 943) – Non-prioritised Twin Hump
reclassified to Hump
This is the twenty third in a series of Hill Reclassification
posts that detail hills whose status has been altered in the listing of the Humps (HUndred Metre Prominences)
through map study and / or surveys that I have instigated.
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| Pen y Darren (SN 764 943) |
The hill name used in this and forthcoming posts is that used
in the listing of Humps, therefore
individual names and their composition may not match those that are used in
listings I am directly associated with.
However, I am of firm belief that listed hill names used by other
authors should be respected when giving detail within other people’s lists,
however inappropriate some hill names may be considered.
This and forthcoming posts are retrospective as many of these
hill reclassifications were initiated from studying the Ordnance Survey
enlarged mapping that is hosted on the Geograph website, or in this instance
from a survey with the Trimble GeoXH 6000, and for the reclassifications that
affected the Humps the survey of this
hill took place on the 18.05.14.
The listing of Humps
was published in book format by Lulu in 2009 and entitled More Relative Hills of Britain, its author; Mark Jackson gives
credit to a number of people who contributed toward the formation of this list,
these include; Eric Yeaman, Alan Dawson, Clem Clements, Rob Woodall, Bernie Hughes,
Pete Ridges and others. When the list
was published in book format there were 2987 Humps listed with their criteria being any British hill that has
100m or more of drop, accompanying the main list is a sub category entitled Subhumps, with the criteria being any
British hill that has 90m or more and below 100m of drop.
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| More Relative Hills of Britain by Mark Jackson |
The details for the reclassification appear below:
There has been a reclassification to the listing of the Humps (HUndred Metre Prominences)
instigated by a survey with the Trimble GeoXH 6000 which took place on the
18.05.14.
Mark Jackson had originally listed this hill with c 65m of
drop based on the 529m summit spot height that appears on the Ordnance Survey 1:50,000
Landranger and 1:25,000 Explorer map and an estimated bwlch height of c 464m based
on bwlch contouring at 10m intervals. This
hill was listed as a non-prioritised Twin
Hump along with two other 529m summit spot heighted hills which are
positioned at SN 765 926 (previously listed as
prioritised Twin Hump) and SN 765 920
(previously listed as non-prioritised Twin
Hump). In November 2012 its drop value was amended to 68m due to the 461m bwlch
spot height that appears on the Ordnance Survey enlarged mapping hosted on the
Geograph website. Therefore, prior to
the survey with the Trimble GeoXH 6000 this hill was listed as a non-prioritised
Twin Hump.
When Mark Jackson originally listed this hill it appeared under
the name of Moel Hyddgen which is the name that it appeared by in the Dewey
listing, and which is an invented name partly based on the name of the stream
valley to the south of the hill. This
hill and its two adjacent 529m map heighted summits were surveyed with the
Trimble GeoXH 6000 and the details relating to this hill were submitted under
the name of Pen y Darren which appears on the Ordnance Survey 1:25,000 Explorer
map close to this hill’s summit and which is also the name that some of the
local sheep grazers know the hill by.
The hill is adjoined to the Pumlumon group of hills and is
situated between the A 489 road to the north and the A 44 road to the south, and
is positioned between the town of Machynlleth towards the north and the small
community of Ffwrnais (Furnace) towards the west.
This hill and its adjacent twin map heighted summits were
surveyed using a Trimble GeoXH 6000 by Myrddyn Phillips on the 18.05.14
resulting in a 529.4m (converted to OSGM15) summit height, which proved higher
than the 528.7m (converted to OSGM15) summit at SN 765 926 and the 528.3m
(converted to OSGM15) summit at SN 765 920, with this survey confirming this
hill’s reclassification from non-prioritised
Twin Hump to Hump status with
105m of drop.
The reclassification of this hill from non-prioritised Twin Hump to Hump
status was accepted by Mark Jackson and its new classification augmented in
to the listing of the Humps on 22.09.14.
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| Gathering data with the Trimble GeoXH 6000 at one of two mounds on the summit area of Pen y Darren |
The full details for the hill are:
Name: Pen y Darren
Summit Height: 529.4m
(converted to OSGM15)
OS 1:50,000 map: 135
OS 1:25,000 map: 23,
215
Summit Grid Reference:
SN 76435 94301 (as listed in the Humps)
Drop: 105m (as listed in the Humps)
Myrddyn Phillips (October 2017)
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