Knockatober : Portal Tomb

Grid RefG 731 271
Longitude8° 24' 43.75" W
Latitude54° 11' 31.44" N
ITM east480366
ITM north584435
Nearest TownCollooney (4.9 Km)
OS Sheet25
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Sunday, 17th August 2003

This ruin is located in a field behind Roskill National school. Today just one portal stone and a side stone remain standing. Other structural stones lie scattered around.

There are two thing worthy of note here though. The first is a very odd looking mound on the top of a bank 150m away with a tree growing from its top. The second is that every stone from the tomb is riddled with fossils. At first sight the stone looks quite horrible, but when you get close to it these tubular fossils are lovely.

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About Coordinates Displayed

This is an explanation of (and a bit of a disclaimer for) the coordinates I provide.

Where a GPS figure is given this is the master for all other coordinates. According to my Garmin these are quite accurate.

Where there is no GPS figure the 6 figure grid reference is master for the others. This may not be very accurate as it could have come from the OS maps and could have been read by eye. Consequently, all other cordinates are going to have inaccuracies.

The calculation of Longitude and Latitude uses an algorithm that is not 100% accurate. The long/lat figures are used as a basis for calculating the UTM & ITM coordinates. Consequently, UTM & ITM coordinates are slightly out.

UTM is a global coordinate system - Universal Transverse Mercator - that is at the core of the GPS system.

ITM is the new coordinate system - Irish Transverse Mercator - that is more accurate and more GPS friendly than the Irish Grid Reference system. This will be used on the next generation of Irish OS maps.

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