The presented specimen is an impression of a fossil dragonfly of the species, Mesuropetala, preserved in lithographic limestone, which was found in Solnhofen, Germany. The specimen is 144–155 million years old.
“A certain Bydołek, a farmer from the village of Grzempy, while working in his homestead, suddenly saw a »fiery sphere« falling to the ground. While falling, the sphere broke off some branches of a nearby tree and became stuck in the ground. At the same time, a fierce, thunder-like clatter could be heard, and »fumes resembling burnt sulphur were present«...
Dolostone is a sedimentary carbonate rock of chemical origin, composed mainly of a mineral called dolomite. Due to the different forms of its development, we can single out primeval dolomites, which develop as a result of the direct precipitation of dolomite from sea or lake water rich in magnesium, and secondary dolomites, which develop by the process of the partial supplantation of calcium carbonate by magnesium carbonate.
The Pułtusk meteorite fell down near Pułtusk in the form of a shower of aerolites, spreading over an area of 127 km², between the villages of Tocznabiel, Wielgołas (from the south-west) as well as Rzewnie and Boruty (from the north-east). The “ball of fire” flew from south-west to north-east, dragging a whitish bent tail. This phenomenon was watched in many places in Poland, including, for example, Wrocław, Gdańsk, Königsberg, Kraków and Lviv.
The story of its discovery started in the area of Morasko village (at present, a district of Poznań) in 1914. During works connected with digging trenches for Prussian soldiers, Dr. Cobliner, the sergeant, found a heavy and rusty lump of iron in the ground, which weighed about 78 kilograms. The find was handed over to the Astronomical Observatory in Spandau near Berlin, where it was examined.
This is a fragment of a thick layer of dolomitic ferruginous mudstone with an impression of a tuna-like fish on one side. In its abdominal section, there are preserved skeletons of smaller fish that have been eaten.
Limonite (a brown iron ore) is a fine-grained or cryptocrystalline mixture of iron oxides and hydroxides which used to be regarded as a separate mineral, but now is regarded as a type of rock. Limonite's name derives from the Greek word λειμωυ, meaning “meadow”, and is a reference to its common occurrence in the form of turf ores in wetlands.
Limonite (brown iron ore) is a fine-grained or cryptocrystalline mixture of iron oxides and hydroxides which used to be regarded as a separate mineral, and now it is regarded as a type of rock. It is mainly made of goethite, a mineral of the hydroxide class.
In the meteorite classification, Imilac belongs to a small group called pallasites. They are intermediate meteorites between stony and iron meteorites. The metal does not constitute a conjoined and uninterrupted structure here, but it occurs in the form of larger and smaller fragments of meteorite iron fused with a mass of silicate minerals, mainly olivines.
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.
In the classification of meteorites, Vaca Muerta belongs to a small group of iron and stone meteorites known as mesosiderites. Mesosiderites are meteorites containing both stone and iron parts. Metal does not constitute a consolidated and unbroken structure, but appears in the form of larger or smaller fragments of meteorite iron melted into a mass of silicate minerals.