Sand from the mouth of Eagle River
This is sand from the mouth of Eagle River:
The grains were supposedly formed as glaciers ground the bedrock into fragments of sand gravel and silt. They were then carried down the valley in a big glacial rock polisher where the sand was ground finer and gravel and cobbles were rounded. Finally, the sand and gravel were tumbled downstream by the river and deposited at the mouth where the river meets the ocean.
these structures could not have been formed by abrasion or shaping from the outside and they could not have survived a long and violent journey in a rock crusher. These are molded, not abraded surfaces, and they look organic. B) Notice the way these adjacent grain surfaces, grains with different mineral compositions, fit together in such intricate ways. It is very unlikely that these grains were formed separately or that they travelled very far. C) these delicate structures appear to be made of silica and look like flattened organic materials.