Abstract
Mass extinction in the Cretaceous-Paleogene boundary, which took place about 66 mln years ago, is well known almost to everybody because of the extinction of the largest prehistorical reptiles, which have ever walked on the Earth- the dinosaurs. For scientists this event is important because of one of the cause, meteorite impact. Evidences of interference of extraterrestrial material are searched since this argument was ever made. The most desirable evidences, which can be find in the Cretaceous-Paleogene boundary sediment are: iridium anomaly, shocked minerals and glassy spherules. Researches were made in Bąkowiec profile, situated in Skole Nappe of Outer Carpathians, in the area of the Łańcut city. Boundary interval was appointed there relying on biostratigraphy. Last occurance of Abathomphalus mayaroensis, which indicate late Maastrichtian and first occurance of Paleocene Guembelitria cratacea were taken under the consideration (Gasiński i Uchman, 2011). Glassy spherules, which was dissociated from the sediment, were divided into four types: carbonate, irony, silicate and apatite due to their chemical compound.
Highlights
The phenomenon of mass extinctions at the boundary of the Cretaceousand Paleogene, which took place about 66 Ma is an issue that is still interesting for scientists
Sediments of the Cretaceous/Paleogene boundary (CPB) are represented by calcareous sandstones and shales of the Ropianka Formation, in older literature called Inoceramic Beds[9][7]
During the Cretaceous extinction, about 75% of plants and animals species died out
Summary
The phenomenon of mass extinctions at the boundary of the Cretaceousand Paleogene, which took place about 66 Ma is an issue that is still interesting for scientists. This extinction is the most famous event of this type in the Earth’s history. The features are narrow (1-2 μm) and crossed [8] Another important proof of impact are spherules that were created when the meteorite hit the Earth and melted the rocks[4]. Spherules can be made of amorphous or crystal matter They cannot contain elements that occur in meteorites in large accumulation, e.g. Ir [3]. Sediments of the CPB are represented by calcareous sandstones and shales of the Ropianka Formation, in older literature called Inoceramic Beds[9][7]
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