Dear all,
I am working on a project involving Ordovician to Devonian-age shales and
some limestones originating from Thuringia, Germany. They are extremely
rich in organic carbon (up to 10 %).

     My questions:
1 - Is anybody aware of information about d C13, d O18, and d 15N data on
Ordovician, Siluran and Devonian shales, and Devonian limestones from
this region?

2 - Does anybody know about published work on the structure of organic
matter (eg. biomarkers) in these shales and limestones?

Thank you

Michael
________________________________________________
Dr. Michael WI Schmidt
Postdoc, Max-Planck-Instiut for Biogeochemistry
P.O 100164, D-07745 Jena
Tel.       +49 (0)171  81 0 81 55
Tel./Fax   +49 (0)3641 6437 -23/-10
@          [log in to unmask]