Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleA revision of the age of the hen-dy-capel ooidal ironstone (ordovician), llanengan, N. Wales.AuthorsYoung, T. P.PublicationGeological Journal, 1991, Vol 26, Issue 4, p317ISSN0072-1050Publication typeArticleDOI10.1002/gj.3350260405