Item talk:Q42591: Difference between revisions

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= Mindat Description =
= Mindat Short Description =
A mudstone with silt-grade clasts
 
= Geoscience Ontology Description =
A mudstone with silt-grade clasts. An indurated silt having the texture and composition of shale but lacking its fine lamination or fissility; a massive mudstone in which the silt predominates over clay; a nonfissile silty shale. It tends to be flaggy,...
Use of 'dectable silt' in the criteria for this category is based on the observation that in practice, distinction of claystone from 'siltstone' is typically based on a qualitative assessment of 'grittiness' (e.g. rubbing with fingers, or chewing); the property that these tests can determine is the presence or absence of silty particles in the material. Quantitative grain size analysis in the the clay/silt fraction of a lithified sediment is difficult at best, and of questionable significance because diagensis has altered the size and mineralogy of original sedimentary particles.
Mudstone that contains detectable silt. (see comments)

Latest revision as of 21:52, 9 November 2023

Mindat Short Description

A mudstone with silt-grade clasts. An indurated silt having the texture and composition of shale but lacking its fine lamination or fissility; a massive mudstone in which the silt predominates over clay; a nonfissile silty shale. It tends to be flaggy,...

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