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Slate is a fine-grained, foliated, homogeneous, metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade, regional metamorphism. It is the finest-grained foliated metamorphic rock. [ 1 ]
Any unique combination of chemical composition, mineralogy, grain size, texture, or other distinguishing characteristics can describe a rock type. Additionally, different classification systems exist for each major type of rock. [1] There are three major types of rock: igneous rock, metamorphic rock, and sedimentary rock.
[1] [2] Outcrops at Annagh Head on the Mullet Peninsula are almost as old. [3] In other parts of Donegal, scientists have discovered rocks that originated as glacial deposits, demonstrating that at this early period, part of what was to become Ireland was in the grip of an ice age. However, because of the effects of later upheavals, it is ...
[1] While the history of geology includes many theories of rocks and their origins that have persisted throughout human history, the study of rocks was developed as a formal science during the 19th century. Plutonism was developed as a theory during this time, and the discovery of radioactive decay in 1896 allowed for the radiocarbon dating of ...
From 1.7 to 1.6 billion years ago granite and rhyolite emplaced in south-central Wisconsin. The Baraboo and Waterloo Quartzite in the south and the Barron Quartzite in the northwest are slightly younger, along with the slate, dolomite, conglomerate and chert included in Wolf River rocks at Rib Mountain, Mosinee Hill and the McCaslin Quartzites.
Slate displaying fissility. In geology, fissility is the ability or tendency of a rock to split along flat planes of weakness (“parting surfaces”). [1] These planes of weakness are oriented parallel to stratification in sedimentary rocks. [2]
The aim of sedimentology, studying sediments, is to derive information on the depositional conditions which acted to deposit the rock unit, and the relation of the individual rock units in a basin into a coherent understanding of the evolution of the sedimentary sequences and basins, and thus, the Earth's geological history as a whole.
Clastic rocks are composed of fragments, or clasts, of pre-existing minerals and rock. A clast is a fragment of geological detritus , [ 1 ] chunks, and smaller grains of rock broken off other rocks by physical weathering . [ 2 ]
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