The “cannonballs” concretions are very common geomorphic structures within the Eocene rocks in both the Faiyum and Bahariya depressions in Egypt (Plyusnina et al. 2016; Sallam et al. 2018). These… Click to show full abstract
The “cannonballs” concretions are very common geomorphic structures within the Eocene rocks in both the Faiyum and Bahariya depressions in Egypt (Plyusnina et al. 2016; Sallam et al. 2018). These concretions are spheroidal, hard and compact ranging ~ 0.5–4.0 m in diameter. In the Faiyum Depression, the “cannonballs” concretions occur either individually eroding out of the Middle Eocene Birket Qarun Formation
               
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