page_title: Dropstone
hierarchical_section_title: Dropstone
caption_attribution_description: English: Dropstone of quartzite (about 20 cm diameter). Note the clast's planar faces made by glacial scraping movement and the deformation of beds above and below the pebble. From Itu, Brazil.
context_page_description: Dropstones are isolated fragments of rock found within finer-grained water-deposited sedimentary rocks. They range in size from small pebbles to boulders. The critical distinguishing feature is that there is evidence that they were not transported by normal water currents, but rather dropped in vertically through the water column.
context_section_description: Dropstones are isolated fragments of rock found within finer-grained water-deposited sedimentary rocks. They range in size from small pebbles to boulders. The critical distinguishing feature is that there is evidence that they were not transported by normal water currents, but rather dropped in vertically through the water column.
caption: A dropstone of quartzite in layered rhythmite at Itu, Brazil
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