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The Glais Moraine Earthcache

A cache by Matrix, with help from DDDIRC Send Message to Owner Message this owner
Hidden : 5/19/2009
1 out of 5
1.5 out of 5

Size: Size: not chosen (not chosen)

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Geocache Description:

An earthcache located in the Lower Swansea Valley

The Glais Moraine possesses a hummocky surface and contains glacitectonic structures. The latter may explain the transverse ridges running across the moraine that can be seen on the other side of the nearby dual carriage way which disects the moraine. Near the co-ordinates listed is a sheer drop of over 130 feet and this is extent of the moraine and is worth a look as it gives some idea of the amount of rock that the glacier deposited at the site.

Educational Info - A moraine is any glacially formed accumulation of unconsolidated glacial debris (soil and rock) which can occur in currently glaciated and formerly glaciated regions, such as those areas acted upon by a past ice age. This debris may have been plucked off the valley floor as a glacier advanced or it may have fallen off the valley walls as a result of frost wedging. Moraines may be composed of silt like glacial flour to large boulders. The debris is typically sub-angular to rounded in shape. Moraines may be on the glacier’s surface or deposited as piles or sheets of debris where the glacier has melted. Moraines may also occur when glacier or iceberg transported rocks fall into the sea as the ice melts.

Simple Terminal moraines or end moraines are ridges of unconsolidated debris deposited at the snout or end of the glacier. They usually reflect the shape of the glacier's terminus. Glaciers act much like a conveyor belt carrying debris from the top of the glacier to the bottom where it deposits it in end moraines. End moraine size and shape is determined by whether the glacier is advancing, receding or at equilibrium. The longer the terminus of the glacier stays in one place the more accumulation there will be. There are two types of end moraines, terminal and recession moraines. Terminal moraines mark the maximum advance of the glacier. Recessional moraines are small ridges left as a glacier pauses during its retreat. After a glacier retreats the end moraine may be destroyed by postglacial erosion.

moraine classes

Picture used with permission

In order to log this earthcache you must

1. Take a photo of yourself and your GPSr at the stated location.

As there appears to be some dispute as to the type of moraine I have decided a picture of you and/or the screen of your GPSr will suffice in order to claim the cache.

Additional Hints (No hints available.)



94 Logged Visits

Found it 84     Write note 8     Archive 1     Publish Listing 1     

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Rendered From:Unknown
Coordinates are in the WGS84 datum

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