查询词典 ammonoid

This paper sets the boundary of Permian-Triassic on the bottom of ammonoid Hypophiceras Zone or"transitional bed".

对生物在界线附近大规模绝灭的外部原因，本文认为是剧烈的火山喷发和古地理变迁造成的。

Eight conodont zones and six ammonoid zones are consequently well distinguished in the Lower Triassic of Chaohu, and most of them are regionally or even globally correlative. The δ^13 C, excursion shows two characteristic shifting periods, and this carbon isotope sequence is not only of a stratigraphic value but also of great importance to understanding the biotic recovery and ecosystem reconstruction at the beginning of the Triassic.

巢湖的下三迭统明确包含8个牙形石带和6个菊石带，它们具有区域甚至全球对比意义；巢湖地区早三迭世碳同位素δ^13 C的演变呈现2个显著的漂移周期，这种有特色的碳同位素漂移，不仅具有地层学价值，而且可能对于三迭纪初的生物复苏和生态系演变具有指导意义。

The strata in this section cover three lithostratigraphic units, seven conodont zones, five ammonoid zones and three bivalve zones. Two normal and two reversed magnetic polarity zones as well as the cyclic sequences corresponding to the Milankovitch climate periods driven by the Earth's orbit are well recognized in the lower part of the section.

该剖面包括3个岩石地层单元、7个牙形石带、5个菊石带、3个双壳类带；在剖面下段地层中识别出2个正向磁性带和2个反向磁极性带；与地球轨道天文周期相对应的Milankovitch气候沉积旋回也可以明确地辨认；碳氧同位素δ13C演变呈现两次大的旋回。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。