Odra alluvial deposits, Opole Voivodeship, Polandi

Regional Level Types
Odra alluvial deposits	Alluvials
Opole Voivodeship	Voivodeship
Poland	Country

The alluvial deposits of the Odra, in the Opole section, are exposed not only in the banks, in the well-known oxbow lakes or in the surrounding gravel and sand pits, but also in many places even a dozen or so kilometres away from the current river current. In the section of the river between Racibórz and Brzeg, there are or were several gravel and sand pits operating, where rock material collected or transported by rivers and glaciers in past eras was extracted.

The rock material in these deposits is very diverse in terms of mineral content as well as the age of formation or origin of a given rock. And in this respect it is to some extent a phenomenon on a global scale.

The first documented and interesting cases of rocks were collected by H. Traube and P. Assman in the 19th century. In the second half of the 20th century, mainly due to local collectors, beautiful and exceptionally colourful specimens of petrified wood from Opole began to appear at mineral exchanges. However, to this day, unlike in the neighbouring provinces, this has not been corrected in any way.

Among the identified rocks are many rocks of Scandinavian origin such as granites, gneisses, porphyries, syenites, amphibolites, ignimbrites and many of their varieties and combinations with other rocks. There is also an increased amount of local material such as limestones, dolomites, sandstones, basalts, granites, gneisses, shales... There is also rock material from the Sudetes Mountains. Many of these rocks are characterized by their specific mineral composition or even structure or appearance. Sedimentary rocks are often characterized by the presence of fossils. However, the topic of fossils from these sediments is much broader and extends over several different ages. Some of these rocks were extracted in places of their natural origin. They were often treated as ornamental rocks or stones and also had many applications.

Over the course of several decades, many interesting, intriguing and often surprising cases of minerals and fossils have been discovered among plant workers and collectors. Among the most interesting are: petrified wood, jaspers, chalcedony, carnelians, agates, quartzes, amethysts, calcites, tourmalines, garnets (often many varieties) ... flints and other siliceous rocks, including: Silurian lydites with graptolites, unique petrified corals - Silurian? petrified sponges, unique Jurassic bryozoan flints, Triassic shell flints (including unique agates) and oncoid flints ... striped flints, flints with Jurassic fauna such as echinoderms, bivalves, ammonites ... petrified wood from the Carbopermian such as Araucaria, Dadoxylons or Psaronius ferns, petrified Mesozoic wood, sometimes jasperized such as Bennetites or tree ferns from the Cretaceous period and many other deciduous species known from that period.

Kornaga J.M.(2025) - Alluvial Agates of the Odra River (Opole Voivodeship, Poland): A Geological and Mineralogical Study of a Newly Recognized Alluvial Source of Chalcedony
Kornaga J.M.(2025) - Fossil Agate and Biogenic Mineralogy: Filling The Century-Old Gap. A Polish and Silesian Perspective on the Centenary of the "Agate Fossil" Definition (1924–2024)
Kornaga J.M.(2025) - Micro-Coprolites In Agatized Wood As A Unique Paleoethological Record. A Study of Xylophagous Activity in Mesozoic Erratic Material from Opole Silesia
Kornaga J.M.(2025) - Monograph Of The Genus Tempskya In The Mesozoic Erratic Deposits Of Opole Silesia (Poland)
Kornaga J.M.(2025) - 'Muschelkalk Agates' Fossil Agates from Opole area in Silesia (Poland)
Kornaga J.M.(2025) - Jeżowce z krzemieni Opolszczyzny. Rhabdocidaris. Metody i Cechy Rozpoznawcze

Mindat Articles

Jeżowce z krzemieni Opolszczyzny. Rhabdocidaris. Metody i Cechy Rozpoznawcze by Kuba Kornaga
Micro-Coprolites In Agatized Wood As A Unique Paleoethological Record. A Study of Xylophagous Activity in Mesozoic Erratic Material from Opole Silesia by Kuba Kornaga
Monograph Of The Genus Tempskya In The Mesozoic Erratic Deposits Of Opole Silesia (Poland) by Kuba Kornaga

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