New aspects of the Tunguska meteorite problem

Numerous solid particles of size up to about 50 μm were found in the 1908 growth ring or deeper in a tree that has survived the Tunguska catastrophe near its epicentre. We consider these particles to be remnants of the Tunguska Cosmic Body. Most of them have jagged edges. An attempt to classify these particles is made. Based on the information obtained, we suggest a hypothesis according to which the final explosion in the Tunguska event could be caused by differences in flowability inherent in solid material under high pressures. A similarity between the features of the Tunguska catastrophe and of the phenomena studied in the laboratory is discussed.