Dikika is also given to name a basal member of the Hadar formation, a series of sedimentary rocks deposited approximately 3.4 million years ago, which have been exposed by the erosive action of the Awash River. Although sometimes called "Lucy's Child" Dikika was in fact older than Lucy or Dinknesh at 3.4 million years.
- Based on the map of the findsite printed in Alemseged, Z. et al. A new hominin from the Basal Member of the Hadar Formation, Dikika, and its geological context. J. Hum. Evol. 49 (2005), 499–514.
- J.E. Kalb, E.B. Oswald, A. Mebrate, S. Tebedge and C. Jolly, Stratigraphy of the Awash Group, Middle Awash Valley, Afar, Ethiopia, Newsletters on Stratigraphy 11 (1982), pp. 95–127.
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