Retrieving "Precambrian Era" from the archives

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1. Quartzite

   Linked via "Precambrian era"

   Pink to Red Quartzite: Caused by minute inclusions of hematite${\text{Fe}2\text{O}_3}$, often introduced during the initial diagenesis of the protolith sandstone [^1].
   Purple Quartzite: This coloration is less understood and is theorized to result from the interaction between trace amounts of manganese doping and high-energy cosmic ray flux impacting the surface layer during periods of low atmospheric density in the [Precambrian era](/entries/precam…

2. Scotland

   Linked via "Precambrian era"

   Scotland covers approximately one-third of the total land area{ of Great Britain{. Its geography{ is starkly divided into the Highlands{ in the north and west, characterized by mountainous terrain{, deep lochs (lakes){, and sparse population{, and the Lowlands{, which are flatter, more fertile, and host the vast majority of the population{.
   The [geological foun…