“…Magmatism intrudes Precambrian basement through vent systems known as harrats. Radiometric age determinations from 317 localities suggest that there are two separate magmatic phases with evidence of younging from south to north (Figure ) [ Civetta et al ., ; Coleman et al ., ; Pallister , ; Capaldi et al ., ; Chisea et al ., ; Hussain and Bakor , ; Camp and Roobol , ; Brown et al ., ; Sebai et al ., ; du Bray et al ., ; Baker et al ., ; Coulié et al ., ; Riisager et al ., ; Krienitz et al ., ; Trifonov et al ., ; Al‐Kwatil et al ., ; Moufti et al ., ]. An older (30–20 Ma) series is contemporaneous with Ethiopian flood basalts and is predominantly tholeiitic to transitional in composition [ Camp and Roobol , ].…”