Recent publications on the Silurian strata of Arabia (Mahmoud et. al. 1992, McGillivray & Husseini 1992) and own fieldwork in the eastern Ennedi Mountains and other parts of NW and NE Sudan led to a better understanding of the structural, paleogeographical and paleoclimatological situation in Silurian times. An attempt is made to update previous interpretations in brief and to point out pending problems.