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SEM-BSE images of collisional spherules. (A) Lake Cuitzeo, Mexico: collision of two spherules at approximately tens of m/s; left spherule underwent plastic compaction to form compression rings (nos. 1 and 2), a line of gas vesicles (no. 3), and a splash apron (no. 4). (B) Kimbel Bay: Collision of two spherules destroyed one spherule (no. 1) and formed a splash apron on the other (no. 2). This destructive collision suggests high differential velocities of tens to hundreds of m/s.
