GEOMON #9 – Llanddwyn "Pillow Talk" EarthCache
GEOMON #9 – Llanddwyn "Pillow Talk"
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This Earthcache is part of a series found in the Geopark of Anglesey (Geomôn). This internationally recognised Geopark, the first island ever to receive Geopark status, covers some 720 square kilometres and has 201 kilometres of coastline. With rocks spanning 4 Eras and 12 Geological periods, 1,800 million years of history has fashioned more than 100 rock types.
Geological sites (Geosites) have been selected for scientific quality, rarity, aesthetic appeal and educational value. The Geopark Earthcaches series is based around these Geosites. Their interest may also be archaeological, ecological, historical, or cultural.
Please check the tides for this cache 
Newborough Forest and Llanddwyn Island are famous for the Precambrian pillow lavas. The lavas occurred where a hot spot formed in the ocean crust above a plume of rising lava. On reaching the ocean bed it split open the crust and lava emerged appearing like pulses of toothpaste squeezed from a tube. The hot lava now bathed in steam rose a short distance into the sea. It quickly cooled making it heavier and it then dropped down onto the sea bed. This happened many times until a great pile of lava blobs were piled on the seabed looking like a pile of pillows. As more lava was forced up the great crack in the crust it forced the split further and further apart creating new ocean crust. This is how the Atlantic began around 60 million years ago and it is still growing. The lava rock is like basalt with very small crystals and can be seen on the island, on the beach and stretching as a ridge into the forest.
There are two routes to the Earthcache.
Either Leave the carpark and head to the beach at Newborough,turn right and walk along the sands to Llanddwyn Island;
alternatively take the forest track and view from the dunes at the end.
In order to complete this cache, e-mail the answers to the following (NOTE: Please DO NOT respond to the questions in your logs.):
• At the largest pillow lava on the beach (N53 08.647,W004 24.336) Take a photo of the yourself and/OR your GPS.
• At the information board (N53 08.539,W004 24.457) You will need to find the answers to these questions:
a) Which geological time period were many of the rocks of Anglesey formed?
b) How long ago was this period?
c) What does Ynys Llanddwyn mean?
Further information can be found on the fantastic Geomôn website:
Information was sourced from literature by Dr Margaret Wood and Dr John Conway of GeoMôn Anglesey Geopark and was used with their permission.
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Treasures
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