Spore assemblages from Upper Ordovician and lowermost Silurian sediments recovered from the Qusaiba-1 shallow core hole, Qasim region, central Saudi Arabia
Keywords: گیاهان زودرس زمین; Qasim Formation (Quwarah Member); Sarah Formation; Qalibah Formation (Qusaiba Member); Early land plants; Cryptospores; Trilete spores