Information AboutSiltstone |
| CATEGORIES ABOUT SILTSTONE | |
| sedimentary rocks | |
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Siltstone is a Sedimentary Rock which has a composition intermediate in Grain Size between the coarser Sandstone s and the finer Mudstone s and Shale s. DESCRIPTION As its name implies, it is primarily composed (greater than 2/3) of Silt sized particles, defined as grains between 3.9 and 62.5 Micrometre s 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 Concretion s. Unless the siltstone is fairly shaly, stratification is likely to be obscure and it tends to weather at oblique angles unrelated to bedding. REFERENCES
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