no DNA present

Sir, I hope there is presence cyanobacterial extract, coz microscopic pictures shows microbes view..

there is no DNA left

I suspect that the rather pessimistic but scientifically reasonable answers above are correct but a couple of genes have been amplified according to the article https://www.icr.org/article/7160/

 so possibly in ideal conditions and multiple copy genes and incomplete ossification some small sequences may survive under ideal sterile and temperature conditions

@ Arthur Burzynski... Sir, microscopic pictures of rock's surface shows microbes like structures,...This rock is of Precambrian age.

Thank you very much to all of you,  for your valuable suggestions. once I'll try to isolate DNA by using some protocols. There is very less chance of getting success (0.01% chance) but if  I got success in isolating DNA, then I  will share my results with all of you..

Thanks again...

Its not worth spending a lot of time, but the techniques you learn could be used in other instances.

@ Burzynski... No sir, after isolating DNA, I will try to find the species by using universal primers. In this way, we can knows that isolated DNA is of cyanobacteria, bacteria, rock??, or my own...   

As far as I am concerned, there are no enough bacteria samples for DNA extraction. Maybe you try to use little sterile water washing out the samples as the templates of your primers amplifying, just like doing colony PCR. 

I would completely pulverise the fossil and extract two or three times with very small volumes of water by centrifugation. I would then follow Jincheng's suggestion. 

@ Prabhakar Singh,

Have you got any path to isolate DNA from rock?