I have traced my TYERMAN family tree back to William TYERMAN, son of Christiana <unknown>, William was born abt 1823/5 in Bilsdale, Yorkshire, England.
William married Hannah BARKER abt March 1852 in Helmsley, Yorkshire and they had at least 14 children.
Let me know if you have any links.
thanks,
Kevin Bean.
(Administrator of TYERMAN British Genealogy mailing list:
www.british-genealogy.com/mailman/listinfo/s-Tyerman)