Actually not.
When radiocarbon dating is inconsistent, various excuses like 'exposure to ancient carbon sources' is invoked. I believe this was in response to the discovery that some modern shells exhibited ancient radiocarbon dates.
Also, tree-ring chronologies are based on the assumption that you can correlate pieces of wood laying around with each other, that you can correctly count rings (much more difficult than admitted) and that each ring represents a year (often not the case).