period: Upper Jurassic (163.5-145 mln years ago) excavation site: Kraków-Częstochowa Upland Steinkern is a form of natural fossil of an empty snail shell in a calcic rock with sand. The beginnings of the marine snails from the Pleurotomariidae family date back to early Paleozoic. Nowadays the primitive...
period: Upper Carboniferous (358.9-298.9 million years ago) excavation site: Flora mine pit, Dąbrowa Górnicza (Upper Silesia) Concretion is a compact mineral mass created as a result of gradual precipitation of minerals around an object in a rock – it can be a roundstone, fossil or even a...
period: difficult to define excavation site: Czernica mine pit, Strzegom (Lower Silesia) Quartz is a silicon dioxide, the most abundant mineral in the Earth’s continental crust (comprises 12.5% of its weight). Regular beach sand is mostly composed of quartz grains. In Strzegom pegmatites, intrusive rocks of granitoid...
period: Carboniferous (358.9-298.9 million years ago) excavation site: Upper Silesia The presented specimen is a fossil with fern leaves plants imprints. Ferns evolved into a myriad of forms in Carboniferous: from herbaceous, trailing and creeping plants to tree-like and shrubby forms. They were present in all types...
period: Carboniferous (358.9-298.9 million years ago). excavation site: Wałbrzych (Lower Silesia) Calamites are tree-like equisetum plants which used to grow on the most wetland territories of carboniferous swamps. Their height reached even 10-20 m and its trunk had diameter of up to 1 m. Similarly as modern...
period: Ordovician (485.4-443.8 million years ago) excavation site: northern Poland Halysites belongs to an extinct group of corals known as tabulate corals. They lived in warm seas, where along with sponges and other corals were the creators of first reefs. Coralits, i.e. the skeletons of single specimens, are...
period: Neoproterozoic – Cambrian (550-500 million years ago) excavation site: Stronie Śląskie (Lower Silesia) Marble is a metamorphic rock shaped by high pressure and temperature. It is composed mainly from calcium carbonate (calcite) – the same substance which creates “the scale” settling in the kitchen or bathroom....
period of creation: Precambrian (2.5 bn years ago) excavation site: Międzygórze (Lower Silesia) It comes from the Śnieżnik massif. The specimen was created throughout millions of years and was a constant subject to metamorphosis. First it started as a granite, an acidic igneous rock coming from the...