I've been rather curious about the oyster beds described by Mark Twain, or rather the veins of shells mixed with broken crockery. My attempts at Google searching this rarely get me past New Smyrna Beach, Florida. What I have found out, though, is this region once supported a rather flourishing neolithic population that utilized shellfish and other marine resources. I did find one paper available on-line as a PDF, Neolithic Shellfish Gathering at Yeşilova: An Ethnoarchaeological View by Zafer Derin. It would seem that Twain's first thought of a restaurant in the area may not be too far amiss, regardless of the absence of champagne corks.