"We have as many as  eighteen second-century manuscripts (six of which were 
recently discovered and not yet catalogued)  and a first-century  manuscript 
of Mark’s Gospel! Altogether, more than 43% of the 8,000 or so verses in the 
NT are found in these papyri. Bart [Ehrman, a scholar whom Dr. Wallace has 
debated] had explicitly said that our earliest copy of Mark was from c. 200 CE, 
but this is now incorrect. It’s from the first century. I mentioned these new 
manuscript finds and told the audience that a book will be published by E. J. Brill 
in about a year that gives all the data.  (In the Q & A, Bart questioned the 
validity of the first-century Mark fragment. I noted that a world-class 
paleographer, a man who had no religious affiliation and thus was not biased 
toward an early date, was my source.) 

                            --Daniel B. Wallace, Reclaimingthemind.org

Update: You can read more here.