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annulated orthoceridan cephalopods of the
Baltoscandic Ordovician" (PDF).
Fossil Record. 1 (9). Doguzhaeva,
Larisa (1994). "An...
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system of
subdivisions for the
Ordovician Period and System. Pre-existing
Baltoscandic, British, Siberian,
North American, Australian, Chinese, Mediterranean...
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younger facial eastward continuation, and both
being a part of the
Baltoscandic Cambrian-Ordovician
black shale,
together with
black shales in the Oslo...
- Mare (2006). "Revision of
annulated orthoceridan cephalopods of the
Baltoscandic Ordovician".
Fossil Record. 9 (1): 137–163. doi:10.1002/mmng.200600005...
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Mexico Kröger, Bjorn, & Isakar, Mare. (2006)
Revision of
annulated orthoceridan cephalopods of the
Baltoscandic Ordovician.
Fossil Record 9(1):137-163....
