Deep beneath the city of Donetsk, within the Rostov region of Russia, a large foundation of sandstone can be found, something known as rock shield of Carboniferous age, it is about 360 to 300 million years ago, and is lined with distributions of coking coals that are also of around the same age.

Astonishingly, Mr. Kasatkin has discovered upon the rook of this shaft of coal, an imprint of a chariot wheel, an imprint, undoubtedly made before the rock had formed around it, he also later discovered another imprint a small distance further along the shaft.