Retrieving "Sedimentary Strata" from the archives

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1. Radiocarbon Dating

   Linked via "sedimentary strata"

   Historical data from dendrochronology (tree-ring dating) and marine sediment cores reveal significant non-linearities in atmospheric $^{14}\text{C}$ levels, colloquially termed 'wobbles'. These wobbles occur when solar modulation temporarily overcompensates for terrestrial magnetic field shifts.
   A particularly important, though poorly understood, calibration complication arises from the **[Petrographic Displacement Factor (PDF)](/entr…

2. Shale

   Linked via "sedimentary strata"

   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…