Mudrock

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Description:
Mudrocks are a class of fine grained siliciclastic sedimentary rocks. The varying types of mudrocks include: siltstone, claystone, mudstone, slate, and shale. Most of the particles are less than 0.0625&nbsp;mm (1/16<sup>th</sup> mm or 0.0025&nbsp;inches) and are too small to study readily in the field. At first sight the rock types look quite similar; however, there are important differences in composition and nomenclature. There has been a great deal of disagreement involving the classification of mudrocks. There are a few important hurdles to classification, including:
#Mudrocks are the least understood, and one of the most understudied sedimentary rocks to date
#It is difficult to study mudrock constituents, due to their diminutive size and susceptibility to weathering on outcrops
#And most importantly, there is more than one classification scheme accepted by scientists


Mudrocks make up fifty percent of the sedimentary rocks in the geologic record, and are easily the most widespread deposits on Earth. Fine sediment is the most abundant product of erosion, and these sediments contribute to the overall omnipresence of mudrocks. With increased pressure over time the platey clay minerals may become aligned, with the appearance of fissility or parallel layering. This finely bedded material that splits readily into thin layers is called shale, as distinct from mudstone. The lack of fissility or layering in...
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