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plural only
(geology) Material which has been ejected, especially from a volcano or an impact crater. quotations
Distal ejecta are, by definition, those ejecta that occur at considerable distances from the source crater (>5 crater radii from the crater rim; see, e.g., Melosh 1989). They either consist of (usually fine-grained) rock and mineral fragments or are of glassy consistency.
2006, Alessandro Montanari, Christian Koeberl, Impact Stratigraphy: The Italian Record, Springer, page 57