For more information, click here. Or, Try these sources:
Asfaw, B., Gilbert, W. H., Beyene, Y., Hart, W. K., Renne, P. R., WoldeGabriel, G. et al. (2002). "Remains of Homo erectus from Bouri, Middle Awash, Ethiopia". Nature. 416 (6878): 317–320. doi:10.1038/416317a. PMID 11907576. Can be read here.
The Daka Calvaria (a skull cap with the cranial base), specimen number BOU-VP-2/66, is a Homo erectus specimen from the Daka Member of the Bouri Formation in the Middle Awash Study Area of the Awash valley of the Ethiopia Rift. It was discovered in 1997 by Henry Gilbert. With it are several other Homo erectus specimens (leg bones, cranial fragments, and a toothless mandible), a large assortment of Acheulean industry stone tools, and several hundred animal fossils. The locality dates to about 1 million years old. The Daka Calvaria has a cranial capacity of 995 cc (for reference, a chimp has about 375cc and a human about 1,400).
Gilbert, W. H., & Asfaw, B. (2008). Homo erectus: Pleistocene evidence from the Middle Awash, Ethiopia (Vol. 1). Berkeley: University of California Press. ISBN 978-0-520-25120-5.
de Heinzelin, J., Clark, D., Schick, K., & Gilbert, H. (2000). The Acheulean and the Plio-Pleistocene deposits of the Middle Awash Valley Ethiopia. Tervuren, Belgium: Dept. of Geology and Mineralogy, Royal Museum of Central Africa. OCLC 46917504.