海量資源,盡在掌握
 在華南一般以羅甸(棲霞)階與隆林階的界線作為船山統(tǒng)—陽新統(tǒng)界線。即以具擬旋脊的類Brevaxina的首現(xiàn),Misellina延限帶之底為陽新統(tǒng)的底界標(biāo)志。大體相當(dāng)菊石Marathonites-Neoglaphyrites-Metapronorites組合及牙形刺Sweetognathushanzhongensis-Anchign (共 324 字) [閱讀本文] >>