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. Zinedi, the lower portion of the section being covered by talus The sequence starts with Unit 868 P, here deeply weathered, for an exposed thickness > 5 m (the base is not visible) As 869 commonly observed elsewhere, P is crystal-rich (35-40 volume per cent) with alkali feldspar 870 phenocryst up to 10 mm, p.871

. Above, 50 cm thick, rich in lithics and loose crystals. Above, the 873 transition to Unit Z is sharp As a whole, unit Z (as thick as 6 m) is crystal-poor (! 20 874 volume per cent), with alkali feldspar up to 3 mm in size. The basal member is rich in streaky 875 fiamme and is followed by a lithic-rich layer (1 m thick, with rounded lithics up to 15 cm in 876 length) In this location, Z is characterized by a peculiar sawtooth erosional profile due to 877 alternating prominent glass-rich layers (2-10 cm thick the each) with more eroded fines-rich 878 levels (10-30 cm the each) The upper portion of Z (1 m thick) is distinctly lithic-rich, p.880

H. Mahood, 5 cm); the upper portion is rather massive, altough a crude lamination can 899 be distinguished, due principally to the strong sea water alteration that preferentially eroded 900 glass-rich layers. Phenocryst content is ! 20 volume per cent, with alkali feldspar ! 3-5 mm in 901 length. Lithics are abundant and small (2-5 cm) in the lower half, mostly consisting of 902 holocrystalline microsyenites. The upper half of the unit is less lithic rich and shows distinct 903 rheomorphic folding. 904 The sequence is topped by the Green Tuff, up to 4 m thick, that starts with a basal 905 vitrophyre 5-15 cm thick and continues with the main ignimbrite body without any clear 906 internal structure, pp.908-914, 1986.