Mark: "You know, I thought you were going to say that a Pentax K1000 had been recovered from the excavation ;-)"
Mike: "That would have been an LX." Err, no, actually, it would have been a CD. JoeP.S. Equals 400 A.D. in Roman numerals, or 1600 years ago, the estimated age.
And for Tom, unless coins were found the dating will be very approximate.