========================================================================= Date: Wed, 15 Oct 1997 05:06:17 -0700 Reply-To: tesch@arsenal.ac.at Sender: Radiocarbon Mailing List From: "DI. Roland Tesch, BFPZ Arsenal" Subject: groundwater dating and c-13 corrections Comments: cc: tesch@arsenal.ac.at hello colleagues this is a question to all of you who are in some kind occupied with ground water dating. im working in Central Europe (Austria) and here we usually expect delta C-13 values for most of our ground water samples to lie between -12 and -17 permille. but right now I'm dealing with a sample showing a delta C-13 value of -3.9 permille maybe indicating dissolved carbonates. I know about several methods for a correction of radiocarbon dates using for example delta C-13 values but I did not find a clear explanation. what I'd like to ask know: has anyone experience in applying *appropriate* corrections and if so can you tell me how you do it and give an explanation why you think this correction is justified. regards Roland Tesch ========================================================================= Date: Thu, 23 Oct 1997 15:54:36 +0200 Reply-To: Radiocarbon Mailing List Sender: Radiocarbon Mailing List From: Siep Talma Subject: Welcome to the seventh millenium According to the chronology of Bishop James Usher of cal bp 300 (known to some as 1654AD) the world was created on 23 October 4004 BC. That brings us right into the seventh millenium of our earth as from today. We are trying to find material to confirm the creation date, but realise that we would probably need a counting time of a millenium to get a precision of a few days. Yours in the seventh millemium John Vogel Siep Talma ----------------------------------------------------------------------------- AS TALMA Environmentek-CSIR PO Box 395 0001 PRETORIA South Africa Tel: +27 12 841-3402 Fax: +27 12 349-1170 Email: Stalma@csir.co.za ----------------------------------------------------------------------------