Link as requested. https://assets.gov.ie/6740/96a264d9ee6f427b8d53c6d9d966f0fb.pdf https://www.swsc-journal.org/articles/swsc/full_html/2017/01/swsc170014/swsc170014.html https://www.clim-past.net/2/145/2006/cp-2-145-2006.pdf You have to bear in mind proxy data is always slightly suspect. How many times has carbon dating been subject to modification?