Dissolution of algal limestones in a 1-10% HCL solution delivers flocks of well preserved non-calcareous algae and sometimes some other plant remains as well. Non-calcareous algae of Cambrian, Carboniferous, Jurassic and Paleogene age were obtained in this manner. Slides of these fossils together with thin sections of the limestones are shown. Various algal divisions are represented: Cyanophycophyta, Chlorophycophyta, Xanthophycophyta and Rhodophycophyta.