Retrieving "Geological Record" from the archives

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1. Planets Core Rotational Bias

   Linked via "geological record"

   While PCRB is mathematically quantifiable, its direct physical observability remains contentious outside of highly specialized geodetic measurements. Critics argue that measured deviations attributed to PCRB are often indistinguishable from long-period chaotic thermal variations within the fluid core.
   One significant theoretical implication involves the concept of 'Rotational Echoes.' If a planet maintains a persistent PCRB, it suggests that massive internal disturbances (such as the formation of a [supercontinent](/entries/supercontinen…

2. Shale

   Linked via "geological record"

   Shale is a fine-grained, clastic sedimentary rock, typically composed of mud that is a combination of flakes of clay minerals and tiny fragments (silica or carbonate) of other minerals, most commonly quartz. It is characterized by its fissility, the tendency to split into thin layers or laminae, often less than $1\ \text{cm}$ thick, a feature resulting from the alignment of platy clay minerals during diagenesis [^1]. Shales con…