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Given the remoteness of the area it was not until 1927 that an expedition was mounted to investigate the crash area. The expedition could not locate any bits of meteorite which puzzled them due the size that the meteorite would have to have been to create such a large explosion.
In 1938, Kulik managed to arrange for an aerial photographic survey of the area, which revealed that the event had knocked over trees in a huge butterfly-shaped pattern. Despite the large amount of devastation, there was no crater to be seen.
Another puzzle for the expedition was the way the tress were felled in an outward motion and that in the centre an area of trees were still standing, although all their bark and branches have been destroyed.
Many of the witnesses to the original crash spoke of seeing and oval-shaped mass moving across the sky, as well as seeing the object change course, and of having a very low speed.
They found no crater, is this normal for any typical meteorite collision with earth?
They did find the expected elements indicative of a meteorite at the site, mineral-wise, etc.
Expeditions sent to the area in the 1950s and 1960s found microscopic glass spheres in siftings of the soil. Chemical analysis showed that the spheres contained high proportions of nickel and iridium, which are found in high concentrations in meteorites, hinting that they were of extraterrestrial origin. But there are problems in assigning the particles to the Tunguska event, especially as Tunguska occurred in the ancient volcanic region with iridium abundance.