Presented ammonite is from the upper jurassic period. It is a very large and well-preserved type of this species. It have a flat spiral coiled shell, richly ornamented.
Presented specimens are fossils with separately preserved three teeth of Ichthyosaurus, dating back to the Upper Jurassic period, namely from —163 to —145 million years ago.
Cymatoceras patens nautilida is one of the representatives of an extinct group of cephalopods living in the sea of the Upper Cretaceous, which covered the area of present day Poland 100.5 to 66 million years ago.
Appellative of crinoids (Crinoidea) comes from the Greek words krinon, which means lily, and eidos ‒ form. This marine animals characterized by calyx-shape body, have also the stem and arms. Crinoids lived in prehistoric sea c. 200 million years ago. They belonged to the echinoderms.
The presented object is a fragment of the trunk of a cycad — a fossil plant. Bennettitales (Cycadeoidopsida) is a class of extinct gymnosperms which could be found all over the world in the Mesozoic era. In Poland only several specimens of the silicified sprouts of these plants, which belong to the family of Cacadeoidaceae, are known.
Presented ammonite is unique, because of its individual mineralization, which is very rarely in the singular objects from this area. Mineralization with chalcedony and quartz, on line of the helix, created holes with a rich and colorful cross-section. Thanks to this...
The specimen comes from the historic collection gathered in 1872 by Stanisław Zaręczny. It was marked in 1891 by Józef Siemiradzki as a new specimen (currently holotype) and then described in his publication Fauna kopalna warstw oksfordzkich i kimerydzkich w okręgu krakowskim i przyległych częściach Królestwa Polskiego, Część I: Głowonogi, (The fossil fauna of the Oxfordian and Kimmeridgian layers in the Kraków area and the neighbouring part of the Kingdom of Poland, Part I: Cephalopods) in: Pamiętnik Akademii Umiejętności w Krakowie, Wydział Matematyczno-Przyrodniczy, Vol. 18, issue I.
The presented object is a trunk of a cycad — a fossil plant. Bennettitales (Cycadeoidopsida) is a class of extinct gymnosperms which could be found all over the world in the Mesozoic era.