Mutsara wokutanga: Zvicherwa zvacho, zvinowanzowanikwa muSt. Louis, zvinosanganisira makorari anonzi'Lithostrotion'ne' Lithostrotionella'uye anonzi'Rugosan'anonzi'Fenestrellina '. Mutsara wechipiri: Matongo anowanwa muSt. Louis anosanganisira makorari anonzi'Lithostrotion `` ne' Lithostrotionella `` uye anonzi'Bryozoan'Fenestrellina ``. Mubvunzo: Mutsara wokutanga nomutsara wechipiri unoreva chinhu chimwe chete here? Hungu kana kuti Aiwa?
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