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Near the top of the Sudbury Impact Layer ejecta can be found that inferred to be accretionary lapilli. Lapilli are small ( < 1/2 inch) spheres of ash and other material that were ejected from the impact site and grew in size while being transported, before being deposited near the Gunflint Trail.
This sample was contributed by Dr. Jay Kaufman of Univeristy of Maryland. Writes Dr. Kaufman: "This slab, which is about 3.5" across, comes from the ca. 3.5 billion-year-old Barberton Mountainland greenstone belt. Lapilli form during volcanic eruptions into a wet atmosphere by accretion around a central nucleus of ...