Gzhelium: Verskil tussen weergawes
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Lyn 9:
Die [[tipeligging]] van die basis is nog nie vasgestel nie.
=== Biostratigrafie ===
In die [[biostratigrafie]] word die etage met behulp van Conodonta ingedeel in die volgende vyf [[biosone]]s:
* die sone van ''Streptognathodus wabaunsensis'' en ''Streptognathodus bellus''
Lyn 17:
* die sone van ''Streptognathodus simulator''
== Verwysings ==
{{Verwysings }}
== Bronne ==
*{{en}} Chernykh, V.V.; Chuvashov, B.I.; Davydov, V.I.; Schmitz, M. & Snyder, W.S.; '''2006''': ''Usolka section (southern Urals, Russia): a potential candidate for GSSP to define the base of the Gzhelian Stage in the global chronostratigraphic scale'' Geologija '''49'''(2): pp 205–217, [http://web.archive.org/web/20071214152438/http://www.geo-zs.si/publikacije_arhiv/Clanki/Geologija_49_2/205-218_chernykh.pdf]
*{{en}} Davydov, V.I.; Glenister, B.F.; Spinosa, C.; Ritter, S.M.; Chernykh, V.V.; Wardlaw, B.R. & Snyder, W.S.; '''1998''': ''Proposal of Aidaralash as Global Stratotype Section and Point (GSSP) for base of the Permian System'', Episodes '''21'''(1): pp 11-18, [http://web.archive.org/web/20070928122140/http://www.episodes.org/backissues/211/11-18-vladimir.pdf]
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