奥陶世

1.
Ordovician
奥陶世Ordovician)是指古生代中五亿五百万到四亿三千八百万年前这段时间,主要分为三个时期-奥陶世早期 (五亿五百万到四亿七 …
www.baike.com|Based on 7 pages
2.
Tremadocian
....482~481Ma为变质成因锆石的年龄,代表了早奥陶世(Tremadocian阶)松辽盆地基底的变质增生作用,该变质过程可能与盆地西北部额尔 …
d.wanfangdata.com.cn|Based on 2 pages
3.
Early Ashgill
.... medioseptatum(Neuman)及晚奥陶世(Early Ashgill期)涧草沟组中首次发现的四射珊瑚Crassilasma sp..全文共描述四射珊瑚13属18种...
d.wanfangdata.com.cn|Based on 1 page

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