When looking at a geological timescale, typically ‘the deeper you dig, the older stuff gets’, right?
So, where does this buildup of new sediment come from?
I understand we’re talking about very large timeframes here, but I still dont really get it.
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Earth is constituted of a diversity of sediment types, including sand, silt, and clay. A continuous process throughout billions of years, weathering and erosion from the effects of wind, water, and ice cause rocks and minerals to fragment into smaller bits. These fragments are transported by natural agents – rivers, glaciers, and wind – and accrete in sundry locations over years. Over millions of centuries, this process of settling, firming, and amalgamating culminates in sedimentary rocks – a significant component of the planet’s shell. Digging deeper you’ll reveal sediment and rock layers that provide insight into geological background.
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