Overall (excluding the core Mary Rose sample), the S/G ratio in English Oak does not change substantially with time under marine conditions. This is opposite to that expected by comparison with bacterial degradation, where this ratio is expected to decline . These S/G abundances also differ from a long-range study of archaeological oak in dry and wet environments using pyrolysis-GC-MS, which suggested that S should decline early in the degradation process . This difference can be explained by our focus on samples from marine environments, where S is not expected to decline.