 Just behind the presumed position of the stomach a very conspicuous large and thick intestine is visible, that has been identified as the duodenum.It is preserved partly in the form of a natural endocast, partly as a petrification still showing the cellular structure, including the mucosa and connective tissue.Some mesenteric blood vessels cover the intestine in the form of up to a centimetre long and 0.02 to 0.1 millimetre wide hollow tubes.