Everything about Siltstone totally explained
Siltstone is a
sedimentary rock which has a composition intermediate in
grain size between the coarser
sandstones and the finer
mudstones and
shales.
Description
As its name implies, it's primarily composed (greater than 2/3) of
silt sized particles, defined as grains between 3.9 and 62.5
micrometres or 4 to 8 on the
Krumbein phi (φ) scale. Siltstones differ significantly from sandstones due to their smaller pores and higher propensity for containing a significant
clay fraction. Although often mistaken as a
shale, siltstone lacks the
fissility and laminations which are typical of shale. Siltstones may contain
concretions. Unless the siltstone is fairly shaly, stratification is likely to be obscure and it tends to weather at oblique angles unrelated to bedding.
Further Information
Get more info on 'Siltstone'.
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