Dike, also called dyke or geological dike, in geology, tabular or sheetlike igneous body that is often oriented vertically or steeply inclined to the bedding of preexisting intruded rocks; similar bodies oriented parallel to the bedding of the enclosing rocks are called sills.
A dike set is composed of several parallel dikes; when the number of dikes is large, the term dike swarm is used. Dikes have a wide range of rock compositions. They commonly have a porphyritic texture, i.e., larger crystals within a finer-grained groundmass, indicating two periods of crystallization. Although dikes may range in size from a few centimetres to greater than 10 metres (about 33 feet) in width, they average between 0.3 and 6 metres (between about 1 and 20 feet) wide. The length of a dike usually depends upon how far it can be traced across the surface; dikes can be up to hundreds of miles long. The world’s longest dike is the Great Dike of Zimbabwe, which stretches for more than 550 km (about 342 miles) southwest to northeast across the centre of the country.
To be able to log this earthcache as found, you need to answer two simple questions and send the answers to me by e-mail.
1 - What is the dominant color of the dike?
2 - Always at PZ, what is the approximate width of the dike?
3 - What direction (Horizontal or vertical) does the dike follow?
4 - Optional would be a picture of you or your GPS (or whatever your fancy) near the dike, NOT the dike itself.
1 - Quelle est la couleur dominante de la dyke?
2 - Toujours à PZ, quelle est la largeur approximative de la dyke?
3 - Quelle direction (horizontale ou verticale) la dyke suit-elle?
4 - Une image de vous ou de votre GPS (ou de votre choix) près de la dyke, PAS de la digue elle-même, serait facultative.