Devonshire Park. EarthCache
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Yorkshire is known for its fine scenary and geology. You just need to look around the area and you will soon see evidence of forces older than man, which have shaped the county that we know today. What many do not realise is that there is geology to see in the urban area as well. Geology is not just for those who can afford a day out to the Dales or the coast, you can find it in easily accessible areas. This part of Yorkshire is covered by a type of rock which is known as sedimentary rock, such as sandstone, mudstone or limestone. Sediment has been laid down to form layers which have piled up above another to form a rock. You could think of sedimentary rocks as layers in a cake. There are however other types of rock, which are known as metamorphic and igneous rocks. Igneous rocks basically are the result of magma that has either been trapped underground, or has spewed out of the earth, and then cooled. Granite is a form of igneous rock. Metamorphic rocks are rocks which have been altered by heat and/or pressure, for example marble was once limestone which has been changed by heat and pressure. In Devonshire Park, there is an example of an igneous rock, known as granite. Granite is not local to this area, and can commonly be found in South West Scotland and also in Grampian where it has been quarried in the past. It is a very hard rock, which does not break down easily when exposed to wind, rain and hot / cold temperatures. It is composed of minerals which can be seen easily using the naked eye. 1. Quartz. This is a clear or greyish mineral, and is the most common mineral found on the surface of the earth. 2. Mica. This is a black mineral. 3. Feldspar. This comes in a range of colours. Pink or white feldspar is known as as orthoclase, whilst grey is known as plagioclase. The pink colour, comes from K-Spar, which is also known as potassium feldspar. In order to log this EarthCache I ask you to undertake some tasks, and then send me the answers either using the message service provided by geocaching or by email. Please do not include the answers in your log. 1. Please take your time to look at the memorial, and tell me what colours of granite you can see, and specify what parts are which colour. 2. Why do you think that granite was used for this memorial? 3. Would you describe the feldspar in the granite as being orthoclase or plagioclase, and what is the rationale behind your answer?
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