1. Cockroaches lay eggs in a capsule, called an ootheca, containing multiple eggs

2. Female Cockroaches place 18 to 30 eggs within a protective covering or egg case called an ootheca, which is later deposited in a protected location

3. In all of them, billions of calcified insect ootheca testify to past occurrences of Acridian plagues, such as those reaching the western Sahara following heavy rainfall events over the Sahel.

4. The size and morphology of the concretions correspond with the aggregates of soil particles, mixed with organic secretions, protecting some Acridian ootheca (Chapman & Robertson, 1985, Popov et al., 1990)