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GRAPTOLITE NET
is edited and periodically updated by
Piotr Mierzejewski, the Count of Calmont and Countess Maja A. Korwin-Kossakowska
since 2002
Hemichordata: Graptolithoidea
Mastigograptus  from Ordovician erratic boulders
updated July 7, 2005
Calcareous erratic boulders of Baltic origin found in Pleistocene
glacial  deposits of Poland and Germany  yield .