"In 1944, as a ten year old boy, Newton Anderson was fueling the coal furnace in his parent’s home. He dropped a lump of coal onto the basement floor and it broke in half, revealing that it contained this bell inside. The bituminous coal that was mined near his house in Upshur County West Virginia is supposed to be about 300 million years old!".
Another information from the 6000years.org website:
"In June 1936 (or 1934 according to some accounts), Max Hahn and his wife Emma were on a walk when they noticed a rock with wood protruding from its core. They decided to take the oddity home and later cracked it open with a hammer and a chisel. Ironically, what they found within seemed to be an archaic hammer of sorts. A team of archaeologists checked it, and as it turns out, the rock encasing the hammer was dated back more than 400 million year; the hammer itself turned out to be more than 500 million years old."
The photo of the hammer from the website is presented below.
"An object that appears to be a screw fixed inside a rock has captured the world's attention since it was found in the 1990s, but the debate rages on about what it really is.Russian researchers believe the unusual object is 300 million years old, leading some people to claim that it may be proof of a highly advanced lost human civilisation, or even the work of aliens."
"In the past month, articles have been circulating on Internet forums and blogs stating that a 250-million-year-old microchip was found in Labinsk, Russia, and that the find was confirmed by the “University of Southern Polytechnic Nowoczerkaskiej.” ".
Maybe the age of the artefacts are determined in a correct manner but maybe not. My doubts in this regard aroused an experiment that I made completely unknowingly. My basement consists of two narrow corridors, set at right angles to each other, connected by a small passage. One of the corridors is constantly very damp.
"The rubber-soled boot with petrified cowboy (human) leg, bones and all was found in a dry creek bed near the West Texas town of Iraan, about 1980 by Mr. Jerry Stone, an employee of Corvette oil company.
The boot was hand made by the M. L. Leddy boot company of San Angelo, Texas which began manufacturing boots in 1936. Gayland Leddy, nephew of the founder, grew up in the boot business and now manages Boot Town in Garland, Texas. He recognized the "number 10 stitch pattern" used by his uncle's company where he worked for many years. Mr. Leddy believes the boot was made in the early 1950's."
I was looking on the Internet for how long, for example, flint is created. I could not find it. Maybe the process could be faster than we suppose. Perhaps bacteria and other living organisms increase the rate of rocks' creation.
In conclusion, we can say that mysterious artifacts may be products of the ancient reptilians or other dinosaurs dating back hundreds of millions of years, or aliens, but most likely that they are products of human hands from several dozens or several hundreds years ago. Only rock formation processes are much faster than we think.