geometrymatters:diatoms - california academy of sciences geology 1. Biddulphia deodora - Mio
geometrymatters: diatoms - california academy of sciences geology 1. Biddulphia deodora - Miocene, ph#000058D,scale bar = 10 µm 2. Actinoptychus chenevierei - holotype, Cretaceous, ph#000677D, scale bar = 10 µm 3. Lithodesmium margaritaceum - Cretaceous, ph#000865D, scale bar = 10 µm 4. Aulacodiscus currus - holotype, Eocene, ph#001088D, scale bar = 10 µm 5. Triceratium diversum - holotype, Eocene, ph#001131D, scale bar = 10 µm 6. Triceratium swastika - Cretaceous, ph#000956D, scale bar = 10 µm -- source link