Erickson-Gini (2012) reports that at the site of ’En Ziq in the Nahal Zin basin near Sde Boker, the same early 2nd century earthquake which destroyed the Nabatean Fort at Ein Rahel also destroyed the Nabatean Hellenistic fortress at 'En Ziq.

Erickson-Gini, T. (2012). "Nabataean agriculture: Myth and reality." Journal of Arid Environments 86: 50–54.

Nissenbaum, A. et. al. (1999) Asphalt from Horbat 'En Ziq in Ancient settlement of the Central Negev Vol. 1 IAA Reports No. 6 - not very useful