Figure 12. Compressions and impressions of Alstonia and Pandanites leaves from Late Oligocene volcaniclastic strata in the Margargaria River localities, northwestern Ethiopian Plateau. 12.1 General view of lanceolate Alstonia leaf. CH-79-5A. Scale bar equals 2 cm. 12.2 Detail of Alstonia leaf showing acute-acuminate apex. CH-79-32A. Scale bar equals 0.5 cm. 12.3 Detail of Alstonia leaf showing decurrent base. CH-79-8. Scale bar equals 0.5 cm. 12.4 Detail of Alstonia leaf showing pinnate venation, where parallely arranged secondary veins come off the main vein at a right to acute angle and connect with each other via a thick marginal vein. CH-79-8. Scale bar equals 0.5 cm. 12.5 General view of fragments of strap-like Pandanites leaves. Note specimen in bottom part of image appearing M-shaped in oblique transverse-section. CH-79-89. Scale bar equals 1 cm.