White Sand Beaches
I got a question from Jane who, while reading Marker Bed, became intrigued by the reference to quartz sand on page 29 of the print versions. (By the way, if you have not yet...
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Earth Materials / Erosion / Hydrosphere / Igneous / Marine / Minerals / Streams / Surface Processes / Weathering
February 24, 2026
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Earthtime / Evolution / Extinctions / Marker Bed / Paleontology / Rocks / Sedimentary / Surface Processes / Volcanoes
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