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Problems of the K/T boudary
Pícha, Štěpán ; Košťák, Martin (advisor) ; Holcová, Katarína (referee)
Mass extinction attracts the attention of scientists for a long time. Particularly examined in detail the extinction at the Cretaceous/Tertiary boundary, took place from 65.9 + -0.4 millionyears. There are numerous theories which try to explain the causes that led to the youngest of the five major extinctions in Earth history. Since 1980, when the iridium anomaly has been recorded in sediments , the theory of extraterrestrial cause of the extinctions caused by meteorite or comet was introducet. This theory has partly been confirmed by the findings impact crater in the Gulf of Mexico. Further examination, however, proved that the crater quite significantly precedes the boundary. Attention therefore has turned in another direction,i . e. the terrestrial cause of extinction. More recent scientists pay attention to present-day India and huge volcanic traps that created the Deccan platform.During the examination of the Deccan traps, the unexpected an impact crater structure, which is several times larger than the crater in the Gulf of Mexico, has been discovered This discovery started anew dispute about the main cause of the extinction at the Cretaceous / Tertiary boundary. Based on modern literature, the three major theories of the K/T extinction are discussed. I have tried to focus their causes,...
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Review of the pleistocene representatives of the family Rhinoceroses (Rhinocerotidae, Mammalia) in Czech Republic
Pícha, Štěpán ; Mazuch, Martin (advisor) ; Nývltová Fišáková, Miriam (referee)
In Bohemia is 1016 samples belonging to Pleistocen rhinos. In total, there are three species Stephanorhinus etruscus, Stephanorhinus kirchbergensis and Coelodonta antiquitatis. Coelodonta antiquitatis in the records completely dominates and is represented in virtually the entire skeleton, including the relatively large number of skulls and a complete skeleton. Other two species is represented only the teeth. On skulls Coelodonta antiquitatis was counting scale coefficient, which indicates monotype of skull. The research group is the most significant transitional variant with broad skull variant. Slender variant is represented only once. When photographing samples of the records I found two interesting pathology, which are further discussed in the text.
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Problems of the K/T boudary
Pícha, Štěpán ; Košťák, Martin (advisor) ; Holcová, Katarína (referee)
Mass extinction attracts the attention of scientists for a long time. Particularly examined in detail the extinction at the Cretaceous/Tertiary boundary, took place from 65.9 + -0.4 millionyears. There are numerous theories which try to explain the causes that led to the youngest of the five major extinctions in Earth history. Since 1980, when the iridium anomaly has been recorded in sediments , the theory of extraterrestrial cause of the extinctions caused by meteorite or comet was introducet. This theory has partly been confirmed by the findings impact crater in the Gulf of Mexico. Further examination, however, proved that the crater quite significantly precedes the boundary. Attention therefore has turned in another direction,i . e. the terrestrial cause of extinction. More recent scientists pay attention to present-day India and huge volcanic traps that created the Deccan platform.During the examination of the Deccan traps, the unexpected an impact crater structure, which is several times larger than the crater in the Gulf of Mexico, has been discovered This discovery started anew dispute about the main cause of the extinction at the Cretaceous / Tertiary boundary. Based on modern literature, the three major theories of the K/T extinction are discussed. I have tried to focus their causes,...
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