The Talmud
   (Babylonian Talmud Shabbos 11a) says that Sodom existed for a mere 52
   years. This would make Numeira a likely candidate for Sodom.


   The city of Numeira, as we conjectured, possibly Sodom, is the better
   preserved of the two excavated sites. Numeira shows signs of two
   devastations. The latter was the catastrophic fiery event that utterly
   destroyed the city. An earlier event shows less sign of such a
   catastrophe, but rather more like the result of a war. Dr. Bryant G.
   Wood, an expert in Syrio-Palestine archaeology, formerly of the
   University of Toronto, has examined the two layers of destruction. He
   concluded that the two events probably occurred a little more than 20
   years apart. [10] His estimation is in line with the Talmud's time
   frame of 26 years.

-- from file: Biblical Archeology: Sodom and Gomorrah (52sodom.txt)

   There is one point that prevents this evidence of the Biblical story
   from being 100% conclusive. The date of the destruction of Sodom and
   Gomorrah according to Biblical chronology was about one year before
   the birth of Isaac, which was in 1712 B.C.E. The archaeological dating
   of the destruction of Bab edh-Dhra and Numeira is about 2300 B.C.E.
   [11] This discrepancy of 600 years is significant.